Objet Objet30 User Manual Download Page 106

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Operating & Maintaining the Objet30 3-D Printer

7–26

DOC-24000 Rev. C

2. Start

the

Wiper

Cleaning

wizard

from

the

Options

the

printer

interface.

Figure 7-33: Starting the Wiper Cleaning wizard

3. Close

the

printer

cover,

and

click

the

wizard

screen.

4. Make

sure

that

the

build

tray

empty,

and

the

printer

cover.

Confirm

this

the

wizard

screen.

Figure 7-34: Wiper Cleaning procedure—step 4

5. Click

Summary of Contents for Objet30

Page 1: ...User Guide English Objet30 3 D Printer System...

Page 2: ......

Page 3: ...nse The 3 D printer referred to in this guide contains a transmitter module FCC ID YH6 RFID NOTE Objet Geometries is not responsible for radio or TV interference caused by unauthorized modification to...

Page 4: ...e following U S patents 5 386 500 6 259 962 6 569 373 6 658 314 6 850 334 7 183 335 7 209 797 7 225 045 7 364 686 7 369 915 7 479 510 7 500 846 7 604 768 7 628 857 7 658 976 7 725 209 Objet Geometries...

Page 5: ...gestion 2 6 Inhalation 2 6 Waste Disposal 2 7 3 Introducing the Objet30 3 D Printing System Work Configurations 3 2 Source Files 3 3 STL Files 3 3 SLC Files 3 3 Printing Materials 3 4 Available Materi...

Page 6: ...laying Large Files 5 20 Tray Viewing Options 5 21 Handling Completed Trays 5 23 Tray Validation 5 23 Production Estimates 5 24 Saving the Tray File 5 24 Printing the Tray File 5 24 Additional Objet St...

Page 7: ...7 18 Maintaining the Objet30 Printer 7 21 Routine Maintenance Schedule 7 21 Cleaning the Print Heads 7 22 Pattern Test 7 24 Improving Print Quality 7 25 Cleaning and Replacing the Wiper 7 25 Cleaning...

Page 8: ......

Page 9: ...DOC 24000 Rev C 1 1 About This Guide Using This Guide 2 For More Information 2 Terms Used in This Guide 3...

Page 10: ...ware and network components of your Objet30 system are installed configured and operating correctly the operator has a working knowledge of the Windows PC platform For More Information Visit http www...

Page 11: ...the Objet30 printer Objet30 software Software running on the computer inside the Objet30 printer that controls all printer operations host server workstation The workstation on which the full version...

Page 12: ...t software These files are bitmaps of individual slices of the object For more information see page 3 3 STL A file type used with Objet software For more information see page 3 3 Support material Mate...

Page 13: ...Features 2 Symbols and Warning Labels 3 Safety Guidelines 4 Printer Installation 4 Printer Operation 4 UV Radiation 4 Printer Maintenance 4 Model and Support Materials 5 First Aid for Working with Pri...

Page 14: ...WARNING Do not defeat override the safety lock Doing so could result in serious personal injury If the safety lock does not function correctly do not use the printer and contact your service provider...

Page 15: ...k of the printer Read the instructions in this document before operating the printer Hot surface On the print head block Risk of burns Do not touch this surface after printing High voltage Near the UV...

Page 16: ...All personnel operating or maintaining the Objet30 printer should know the location of first aid and emergency equipment and how to use it Never block access to this equipment Keep fingers and other...

Page 17: ...rectly handling it To prevent skin irritation wear neoprene or nitrile gloves If there is any chance that model and support materials might splash into the eyes wear safety goggles Prolonged direct co...

Page 18: ...cream was used do not reapply it until the skin has been completely cleansed Contact with Eyes If uncured printing material comes in contact with the eyes flush immediately with large amounts of wate...

Page 19: ...waste Therefore printing material waste must be packaged and disposed of in a manner that prevents human contact with it and contamination of water sources Empty model material and support material c...

Page 20: ......

Page 21: ...3 Printing Materials 4 Available Materials 4 Storage 4 Shelf Life 5 Exposure to Light 5 Safety Considerations 5 Disposal 5 Work Environment 6 Workstation Requirements 6 Preparing Files for Use with Ob...

Page 22: ...stem can serve multiple users In such configurations each user workstation client prepares files with Objet Studio software for production A server host typically next to the 3 D printer acts as a job...

Page 23: ...the more triangles are needed The result is that high quality object descriptions mean very heavy files Most CAD software can export STL files The Objet30 system utilizes these files for building mode...

Page 24: ...their properties go to www objet com Materials Storage Materials used for printing models with Objet30 printers are made of resins which are composed of reactive monomers and oligomers Although print...

Page 25: ...ally solidification Safety Considerations Before being cured resins are hazardous materials To prevent possible health hazards follow these precautions regarding printing materials Do not expose to fl...

Page 26: ...Windows 7 32 bit Professional Ultimate Enterprise editions Windows Vista 32 bit Ultimate Business Enterprise editions Recommendations Monitor resolution 1280 x 1024 pixels Color quality 32 bit Two Et...

Page 27: ...ending on the CAD software used but the following instructions generally apply To convert a file to STL format in a CAD program 1 From the File menu select Save As 2 In the Save As dialog box open the...

Page 28: ...Using Objet Studio to perform these tasks is described in detail in chapter 5 Using Objet Studio Job Manager Job Manager is different for client workstations and for the computer connected directly t...

Page 29: ...DOC 24000 Rev C 4 1 Installing Objet Software How to Install Software for the Objet30 3 D Printing System 2...

Page 30: ...t Studio CD into the disk drive 2 Right click the Start button and select Explore or use any other method for displaying files on the computer 3 Open the CD drive folder and select Setup To run the in...

Page 31: ...and Job Manager for the server host station and for a standalone station that is the computer directly connected to the Objet30 printer Figure 4 3 Objet Setup Choose Destination Location screen 6 In t...

Page 32: ...e icons in another program folder select it To continue click Next Figure 4 5 Objet Setup Select Printer Type screen 8 In the Select printer type screen select the Objet 3 D printer used for producing...

Page 33: ...nstallation you must restart the computer You can do so now or at another time 9 Select either Yes or No and click Finish Make sure to remove the CD from the disk drive before restarting the computer...

Page 34: ......

Page 35: ...bject s Orientation 15 Freezing an Object s Orientation 16 Surface Finish 16 Default Object Properties 17 Display Options 18 Display Colors 19 Displaying Large Files 20 Tray Viewing Options 21 Handlin...

Page 36: ...Studio opening screen Toolbars The icons shown in this chapter are available only when relevant toolbars are displayed You can control the toolbars displayed at any time and you can re arrange them o...

Page 37: ...lection toolbar Note It is not necessary to select the model material now but it is recommended each type of material has unique characteristics that may affect the valid positioning of objects on the...

Page 38: ...ons but not its units of measure Therefore make sure to correctly select either millimeters or inches when inserting an object Otherwise the size of the object on the build tray will be either much to...

Page 39: ...keyboard shortcuts Ctrl C and Ctrl V respectively The Paste Special command in the Edit menu enables you to place duplicate objects even more efficiently You can specify the number of duplicates to pl...

Page 40: ...ut From the View menu select Layout then the desired number of build tray views 2 Views is the default screen layout already displayed see figure 5 5 on page 4 By default the object properties dialog...

Page 41: ...et30 User Guide Figure 5 9 4 view screen layout Figure 5 10 1 view screen layout You can change the perspective of the active viewing pane by clicking any of the nine viewing icons Figure 5 11 Viewing...

Page 42: ...onsiderations explained in Model Orientation on page 5 10 Automatic Positioning There are two ways to have Objet Studio position the items on the build tray Anytime you insert an object onto the build...

Page 43: ...placement with the Arrange models option selected in the Insert dialog box Considerations for positioning objects are reviewed in Model Orientation on page 5 10 Tools for changing the position of obj...

Page 44: ...onsiders models where after being orientated on the build tray according to other considerations one side is taller than the other Since the print heads move along the X axis from left to right taller...

Page 45: ...tly positioned on the tray 1 From the Tools menu select Options and display the Settings tab Figure 5 15 Options dialog box Settings tab 2 In the Automatic Lay On Gravity section select Always This is...

Page 46: ...the object on the build tray Object Translate For selecting and moving an object with the mouse Click the object to select it Drag the object to a new location while holding down the mouse button Obje...

Page 47: ...Position on the Z Axis on page 5 11 The properties displayed in the Transform tab of the object properties dialog box are absolute values representing the actual position of the object on the build t...

Page 48: ...w and configure grid settings and apply them from the Options dialog box To use the Options dialog box 1 From the Tools menu select Options and display the Grid tab Figure 5 19 Options dialog box Grid...

Page 49: ...menu 1 Select Plane Alignment Select Plane 2 Click a plane on an object displayed on the build tray 3 Select Plane Alignment Align Bottom Top Front Back Left Right as appropriate Note When you are fin...

Page 50: ...he printer surrounds models with a thin layer of support material To choose the finish type for a model 1 Select the model 2 In the Options tab of the object properties dialog box select Matte or Glos...

Page 51: ...rface finish for printed models For an explanation of this feature see Surface Finish on page 5 16 support strength used during printing For an explanation of this feature see Choosing the Support Str...

Page 52: ...and model displayed in shaded view The other display options are wire frame and points To display the build tray in wire frame view Select View WireFrame or click the WireFrame icon Figure 5 23 Tray...

Page 53: ...for displaying objects on the build tray To change the colors displayed in Objet Studio screens 1 From the Tools menu select Define Colors 2 In the Define Colors dialog box click the color patch you w...

Page 54: ...se you can display just an image of the object on the build tray without loading the entire file The stl file itself is not changed and the complete file is sent to the printer To display an image of...

Page 55: ...active viewing pane with an area of the build tray after you select it with the mouse Zoom Dynamic Continuously zooms in out of the point at which you click and hold down the left mouse button when y...

Page 56: ...zooms in to the tray displayed in the active viewing pane Advance Backward The same as Each mouse click zooms out of the tray displayed in the active viewing pane Rotate Left Each mouse click rotates...

Page 57: ...d take Tray Validation Before sending a job to the Objet30 printer for production you should check that the tray is valid and can be printed To validate that the tray can be printed From the Tools men...

Page 58: ...ing the Tray File Trays are saved as objtf files You can save a tray before it is ready for production and open it at another time to continue preparing it When you send the tray to the Objet30 printe...

Page 59: ...dels as they are positioned on the tray click Yes Figure 5 33 Constraints Settings dialog box with color codes for problematic model positioning The tray file is sent to Job Manager Objet Studio close...

Page 60: ...OK The composite parts are saved as new stl files with Part 1 Part 2 etc added to the original file name Note Before printing the newly created stl files it is recommended that you check them for def...

Page 61: ...since this material burns off more quickly during the process of making the cast Objet Studio enables you to print objects on the build tray with an outer shell of model material and a center filled...

Page 62: ...cessary when producing the model see Choosing the Support Strength on page 5 26 Displaying an object s cross section only affects how the tray is displayed on the screen it does not change the object...

Page 63: ...5 39 Save Bitmap dialog box 2 At the top of the dialog box select the appropriate folder 3 At the bottom of the dialog box enter a file name 4 Open the Save as type pull down menu and select the file...

Page 64: ...Objet Studio features described in this section are only accessible if the application is set to Advanced mode To see the current Objet Studio setting Open the Tools menu Figure 5 40 Tools menu showin...

Page 65: ...ts from every angle To save the build tray as an stl object 1 From the File menu select Save Tray As Figure 5 42 Save As dialog box 2 At the top of the dialog box select the appropriate folder 3 At th...

Page 66: ...om the Tools menu select Options 2 In the Options dialog box display the Advanced tab and click OpenGL Driver Configuration Figure 5 43 Accessing GL driver configuration Note If the Advanced tab is no...

Page 67: ...D 1 Select Choose Format 2 Click Test Objet Studio returns the recommended pixel format ID Figure 5 45 Recommended pixel format ID 3 Click OK 4 In the OpenGL Driver Configuration dialog box figure 5 4...

Page 68: ......

Page 69: ...b Manager 2 Job Manager Screen 3 Job Manager Operations 4 Configuring User Alerts 5 Server Job Manager 7 Job Manager Screen 8 Job Manager Operations 9 Making changes to a Job 10 User Alerts 11 Sending...

Page 70: ...d enables re sending previously printed jobs to the printer Client Job Manager When you open the client Objet Studio Job Manager software for the first time a dialog box opens prompting you to connect...

Page 71: ...egan but was interrupted by the administrator before being completed Stopped Printing of this job was terminated by the administrator and was put in the print queue again Error Errors occurred during...

Page 72: ...ose 3 D Printer New Job Launches Objet Studio to prepare new trays 3 D Printer Set Printer Displays a network browsing dialog box to connect to an Objet server computer To specify a computer it must b...

Page 73: ...supporting MAPI is installed on the printer s server computer To send SMS messages the cellular phone service must support the transmission of e mail messages by SMS With SMS alerts only the subject l...

Page 74: ...pective sections 3 To choose the events reported to you by Job Manager click Details in the relevant sections Figure 6 5 Event selection for alerts 4 Select the desired events for sending alerts and c...

Page 75: ...Connection dialog box opens see figure 6 6 You can switch the server connection to another printer at any time To set or change the printer connection 1 From the 3D Printer menu select Set Printer 2...

Page 76: ...ob began but was interrupted by the administrator before being completed Stopped Printing of this job was previously terminated by the administrator and later put in the print queue again Error Errors...

Page 77: ...late jobs in other ways see Job Manager Operations below Icon Menu Option Purpose 3 D Printer New Job Launches Objet Studio for preparing new trays 3 D Printer Set Printer Displays a network browsing...

Page 78: ...tatus to Waiting Job Stop Instructs the 3 D printer to stop printing after curing the currently printed slice You can continue printing with the Resume icon or menu option but for short interruptions...

Page 79: ...erts on page 6 5 To set parameters for Low level of material alerts 1 From the 3 D Printer menu select Material Consumption 2 In the dialog box that opens set the time or the material weight remaining...

Page 80: ...g icon changes color from a yellow to a red background Sending the Tray to the 3 D printer for Production If there is a job in the print queue it is sent automatically to the Objet30 printer as long a...

Page 81: ...Printer 16 Shutdown Wizard 16 Material Flush Fill Wizard 18 Maintaining the Objet30 Printer 21 Routine Maintenance Schedule 21 Cleaning the Print Heads 22 Pattern Test 24 Improving Print Quality 25 C...

Page 82: ...Figure 7 2 Main power cable and switch The main power switch turns on the Objet30 printer which includes the built in Objet30 computer Printer cover Printing materials waste compartment Printer stand...

Page 83: ...nter computer for the application to open This key should be installed during printer installation If the application does not open and a HASP message appears contact your dealer or Objet Customer Sup...

Page 84: ...el Material on page 7 11 Otherwise make sure to replace the model cartridge with one containing the same type of material To load model and support cartridges 1 On the front of the Objet30 printer see...

Page 85: ...ot interrupted When the drawer is open the cartridges are not displayed in the printer interface If printing stops for an extended time before you replace a material cartridge the printer may go into...

Page 86: ...nd clean the tray thoroughly with cleaning fluid 2 Make sure that there is sufficient model and support material loaded in the printer as indicated in the Objet30 printer interface see figure 7 3 You...

Page 87: ...the supply cartridges printing proceeds automatically until the job is finished The Objet30 printer uses one model material cartridge and one support material cartridge to produce models When four ca...

Page 88: ...igure 7 7 Waste The weight of the waste container is 1520 grams more than allowed when beginning a print job See Replacing the Waste Container on page 7 54 Blue not ready For example in figure 7 7 UV...

Page 89: ...a print job and you don t replace the empty cartridge immediately After the printer changes to Standby or Idle mode you need to resume printing from Job Manager To continue printing the model 1 If the...

Page 90: ...interruption in printing even if the last slice and continue from slice indicators are correct The part of the model already printed may deform or shrink and there might be a visible difference betwee...

Page 91: ...lick Next 3 If the printer cover is not closed a screen appears instructing you to close the cover Confirm that it is closed and click Next 4 In the Compartment Selection screen select the cartridge s...

Page 92: ...ich takes about 25 minutes the pump purges the model material from the print block then flushes the system with the new material Since traces of the previous material may be present in the first model...

Page 93: ...ing one cartridge 450 grams 10 when replacing two cartridges 7 Click Next and take note of the warning screen Figure 7 14 Material Replacement warning screen 8 To continue click Next 9 When prompted b...

Page 94: ...al wizard screen appears make sure that the screen displays the newly loaded material s Click Done to close the wizard The printer control interface is automatically updated and should display the new...

Page 95: ...7 3 7 7 and 7 8 on pages 3 8 and 9 If after printing a job you know that the printer will not be used for 10 hours or more you can immediately turn off the heating of the print heads by putting the pr...

Page 96: ...Material Flush Fill Wizard Material Flush Fill Wizard This wizard replaces printing materials in the print heads with cleaning fluid Use this wizard if you need to shut down the printer for more than...

Page 97: ...dure may take up to 10 minutes while the following tasks are performed a The print block returns to its starting point on all axes b The print heads are heated c The print heads are cleared of any rem...

Page 98: ...heads then flushes the system with cleaning fluid This process takes about 60 minutes For this procedure you need to load four 4 cleaning fluid cartridges in the cartridge drawer To restore the printe...

Page 99: ...30 User Guide 4 Load the required cartridges close the cartridge drawer and confirm this in the wizard screen Figure 7 22 Cartridge confirmation screen before shutdown Figure 7 23 Cartridge confirmati...

Page 100: ...rial flushing cycles Figure 7 24 Flushing cycles in progress 6 If cleaning fluid cartridges are loaded in the printer the wizard prompts you to remove them Confirm this in the wizard screen and click...

Page 101: ...e Pattern Test on page 7 24 Weekly Clean and inspect the wiper See Cleaning and Replacing the Wiper on page 7 25 Weekly Restart the printer computer and the server computer Monthly and after replacing...

Page 102: ...tray This procedure takes about 20 minutes To clean the print heads 1 Prepare isopropanol IPA isopropyl alcohol or ethanol ethyl alcohol disposable cleaning gloves an Objet supplied cleaning cloth or...

Page 103: ...izard screen see figure 7 27 and click Next 11 Remove the cleaning materials from the printer and close the cover 12 Select the confirmation check boxes in the wizard screen and click Next The head pu...

Page 104: ...sheet of pink paper approximately 21 14 centimeters in size 8 5 5 5 inches half of the standard A 4 or Letter size 3 In the Objet30 printer tape the pink paper to the center of the build tray 4 Press...

Page 105: ...emoves excess material from them 3 Repeat the purge sequence 4 Perform the pattern test If the results of the pattern test are still poor 1 Manually clean the print heads see Cleaning the Print Heads...

Page 106: ...e Options menu of the printer interface Figure 7 33 Starting the Wiper Cleaning wizard 3 Close the printer cover and click Next in the wizard screen 4 Make sure that the build tray is empty and close...

Page 107: ...e wiper is scratched torn or worn or if you cannot clean it completely replace it a With the M2 5 Allen key loosen but do not remove the screw securing the wiper Wiper and excess material drain b Gras...

Page 108: ...engineer during regular maintenance visits Occasionally however a blockage or damaged scraper may cause material leakage on the build tray If this happens remove the roller waste collector and replace...

Page 109: ...ring the UV lamp assembly and remove the assembly Figure 7 42 UV lamp assembly securing screws 5 Move the print block all the way to the front of the printer exposing the roller waste collector lockin...

Page 110: ...he next maintenance visit the customer support engineer will replace the scraper for future use If the scraper is not damaged carefully remove any waste from the waste channel taking care not to touch...

Page 111: ...er of the standard A 4 or Letter size any type of sticky tape to fasten the transparency sheet to the build tray 2 Start the Head Alignment wizard from the Objet30 Options menu see figure 7 33 on page...

Page 112: ...print head Figure 7 46 Sample head alignment test The top row was printed by the head used for applying model material when producing models The bottom row was printed by the head used for applying s...

Page 113: ...reen This does not change the head alignment If you select other numbers the wizard adjusts the head alignment accordingly 12 Click Next The following screen is displayed Figure 7 48 Updating System P...

Page 114: ...al lines for a print head were at either extreme choose Yes to run the head alignment wizard again then click Next The transparency test will show if the heads are now properly aligned and if not the...

Page 115: ...acing a print head and adjusts components of the Objet30 printer to enable you to perform it Only replace a print head with the aid of the wizard The procedure takes about 75 minutes and consists of t...

Page 116: ...tems before running the Head Replacement wizard 2 Start the Head Replacement wizard from the Options menu of the printer interface see figure 7 33 on page 26 3 In the opening wizard screen click Next...

Page 117: ...warning screen 6 Click Next if you are ready to continue 7 Open the Single Head Replacement kit and remove the safety gloves and the instructions 8 Put on the safety gloves 9 When the following screen...

Page 118: ...er 7 38 DOC 24000 Rev C Removing the Defective Head Support Print Head If you do not need to replace the model print head continue with Support Print Head on page 40 To replace the model print head yo...

Page 119: ...DOC 24000 Rev C 7 39 Objet30 User Guide Model Print Head Installing the New Head Model Print Head Important Remove the protective tape from the surface of the new print head...

Page 120: ...C 24000 Rev C Support Print Head Important Remove the protective tape from the surface of the new print head 10 In the Head s Replacement screen see figure 7 53 on page 37 select the check box to conf...

Page 121: ...ou have removed all tools and objects from the printer Figure 7 55 Cleared tray confirmation screen 13 Close the printer cover The wizard continues by filling the heads then heating and purging them I...

Page 122: ...rs Figure 7 56 Used print head message To continue with the installation of this print head click Yes To remove this print head and install a new one click No If the printer software does not sense th...

Page 123: ...select the check box to confirm that you have installed another print head and click Next c Contact your authorized Objet Customer Support center about the unformatted head If the vacuum test is not s...

Page 124: ...es Figure 7 60 Weight test progress screen 14 Carefully remove the samples for each head keeping track of the head that printed them Figure 7 61 Samples printed on the Objet30 printer build tray 15 Us...

Page 125: ...Replacement screen 17 After replacing print heads you should check the head alignment before using the Objet30 printer to produce models Select Yes and click Done to open the Head Alignment wizard see...

Page 126: ...once a month with the Load Cell Calibration wizard To calibrate load cells 1 Start the Load Cell Calibration wizard From the Options menu of the printer interface see figure 7 33 on page 26 select Wi...

Page 127: ...alibrate more than one load cell the next calibration screen appears Repeat steps 4 and 5 until all of the load cells are calibrated 6 Click Done in the final wizard screen Figure 7 67 Final wizard sc...

Page 128: ...ear as necessary to keep your working environment pleasant This is normally done during the yearly preventive maintenance service visit To replace the odor filter 1 Locate the filter drawer at the rea...

Page 129: ...cator red The online offline button the printer interface should be red If not click it to switch the printer to offline mode 2 Start the UV Lamp Replacement wizard From the Options menu of the printe...

Page 130: ...V lamp cable and the fan cable Figure 7 72 Disconnecting the UV lamp assembly 5 Loosen the two side screws securing the UV lamp assembly to the printer Figure 7 73 UV lamp assembly 6 Remove the assemb...

Page 131: ...re 7 74 UV lamp cover screws 8 Loosen the two screws securing the UV reflector Figure 7 75 UV reflector screws 9 Remove the UV reflector by raising it slightly then pulling it out of the housing at an...

Page 132: ...ard the old reflector and lamp 12 Insert the new UV lamp reflector unit into the housing 13 Make sure that the UV lamp cable is in place inside the housing and then tighten the securing screws Figure...

Page 133: ...nd that the black strip is attached then click Next Figure 7 79 UV installation confirmation screen The wizard operates the lamp to test if it is installed correctly If the lamp does not light the wiz...

Page 134: ...of the printer interface To monitor the waste weight and other indicators in the Objet30 printer In the main printer interface screen click the display toggle to view the Objet30 printer indicators Fi...

Page 135: ...he cap securing the waste drain tube 4 Carefully lift out the waste container to remove it from the printer 5 Close the full container with a sealing cap 6 Place the new waste container in the materia...

Page 136: ...ish offering excellent chemical resistance to common cleaning agents However follow the recommendations below when cleaning these areas of the printer Acceptable Cleaning Agents mild soap solution com...

Page 137: ...hem if necessary using desktop icons Figure 7 85 Backup and restore desktop icons ReInitiate Wizard One of the wizards listed in the Options menu is ReInitiate You normally do not have to run this wiz...

Page 138: ......

Page 139: ...DOC 24000 Rev C 8 1 Handling Printed Models Removing Models After Printing 2 Removing the Support Material 2 Storing Models 3...

Page 140: ...enly 4 Let the models cool for several hours Removing the Support Material After printed models have cooled the support material must be removed This can be done by different methods depending on the...

Page 141: ...oved but it is typically between half an hour and several hours In any case you should remove as much support material as possible before the caustic soda treatment and rinse the model thoroughly with...

Page 142: ......

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