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Prusa Research i3 MK2.5S Multi Material Upgrade 2S, User Manual, Page: 7 / 46

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Prusa Research i3 MK2.5S Multi Material Upgrade 2S User Manual Download Page 7

 

2 Quick-start instructions 

We get it. You just assembled the MMU2S according to Assembly Guide, connected it to 
your printer and now you are eager to start printing. :) But give us just a second! There’s a 
couple of important steps you need to take before you can print your first multi-material 
G-Code. Please note that these instructions are just a quick overview for users who already 
have experience with 3D printing. We highly recommend reading the full instructions. 
 

1. Download and install Drivers & Apps from 

​

www.prusa3d.com/drivers

​

, update 

printer firmware with Slic3r PE 1.41+. 

     

 

 

2. Place filament spool holders next to the printer, the filament buffer behind the 

printer and pull filament strings through the filament buffer in designed order. 

 

 

 
 

3. Run Z-axis and First Layer calibrations. 

 

 

4. Print your first test object! 

 

6 

Summary of Contents for i3 MK2.5S Multi Material Upgrade 2S

Page 1: ...ENG ...

Page 2: ...andbook is based on the MMU2S firmware version 1 0 5 and MK3S MK2 5S firmware version 3 6 0 Using other older firmware versions may lead to incorrect results Please update your MMU2S unit regularly USEFUL LINKS Official website www prusa3d com Newest drivers www prusa3d com drivers Knowledge base help prusa3d com E shop shop prusa3d com Slic3r PE GitHub www github com prusa3d MMU2S Objects www pru...

Page 3: ...till ongoing Currently the Original Prusa i3 MK3S is on the market the third and latest iteration of the original 3D printer It is constantly updated with the latest innovations such as the brand new Multi Material Upgrade 2S which you have just purchased Josef Prusa also organizes workshops for the public participates in professional conferences dedicated to the popularization of 3D printing For ...

Page 4: ...ad to the nozzle 14 6 6 Unload filament 14 6 7 F I N D A explained 15 7 Calibration 15 7 1 IR filament sensor calibration 15 7 2 Calibrate the Z axis 16 7 3 First Layer Calibration 17 7 4 Individual filament calibration 19 8 First Print 19 9 Printing in Multi Material Mode 20 9 1 Importing objects into Slic3r PE STL 3MF AMF 20 9 2 Setting up colors 21 9 3 Slicing a multi material object 22 9 4 Sma...

Page 5: ...blinking red 39 13 4 All five LEDs blinking red and green 39 13 5 Selector not moving 39 13 6 Loud clicking and idler unable to move freely 40 12 6 Filament not extruded during the print missing layers 41 13 7 Filament cannot go through the selector 41 13 8 Different filament tip shapes after the unload 42 13 9 F I N D A does not detect the absence of the filament 43 13 10 Pulleys covered with fil...

Page 6: ...making the complicated filament length calibration obsolete The MMU2S allows to load up five filaments simultaneously which enables the users to print even more complex and more colorful objects To unlock the maximum potential of your printer with the MMU2S use our latest Slic3r Prusa Edition slicing software Offering a multitude of unique features Slic3r PE is the go to solution for single and mu...

Page 7: ...note that these instructions are just a quick overview for users who already have experience with 3D printing We highly recommend reading the full instructions 1 Download and install Drivers Apps from www prusa3d com drivers update printer firmware with Slic3r PE 1 41 2 Place filament spool holders next to the printer the filament buffer behind the printer and pull filament strings through the fil...

Page 8: ...in clips Pay attention to the correct orientation of the filament buffer 2 Attach PTFE tubes leading from the MMU2S unit in the designated order and secure them with screws See the Pict 4 3 Place the spool holders into two lines The first line of spool holders should be at least 20 cm from the filament buffer Three spools are in the front line and two spools between them in the rear line Make sure...

Page 9: ... in various issues during printing 4 Flashing the firmware Before you start using the MMU2S the printer s firmware needs to be updated otherwise the printer won t communicate with the new unit The MMU2S motherboard can be also updated with a new firmware which comes as a separate file Please keep in mind that there are slightly different flashing procedures for each board and that firmware files f...

Page 10: ...that Slic3r PE and Drivers are selected in the installation wizard 3 Turn on the printer and wait for the initialization to complete 4 Connect your printer to your PC using a USB cable The type of USB cable and the port depend on which type of firmware you want to flash a TO FLASH PRINTER FIRMWARE Use the standard procedure connect the printer mainboard RAMBo to your PC using a square shaped USB B...

Page 11: ...ct 8 Flashing new firmware If the MMU2S unit is not recognized in the Device Manager it s possible that your antivirus software has prevented the drivers from installing Try installing them manually from the destination directory it s C Program Files Prusa3D Rambo by default Also you can try a different USB port or a micro USB cable To flash the firmware on MacOS or Linux please download the lates...

Page 12: ... the printer is turned on with a string of filament loaded in the nozzle which blocks the selector from moving During homing procedures a repeated clicking can be heard Don t worry about it it s a part of the procedure 6 Loading Unloading Selecting Ejecting filament It s essential that you cut the end of the filament as shown in the picture The sharp tip ensures proper insertion of the filament in...

Page 13: ...lament into the correct PTFE tube and push it until it s caught by the drive gear 4 The filament will be pushed until it s detected by the FINDA then it will be retracted from the selector ready to be extruded when needed 5 The LED will turn green 6 3 Loading one of the filaments using the MMU control buttons 1 Using the left and right control buttons move the selector to the position correspondin...

Page 14: ...enu Eject Filament Eject Filament 1 2 3 4 5 It s advised to run this procedure after you use up filament scraps through the automatic depletion function LCD Menu Settings SpoolJoin on off 9 2 SpoolJoin It allows you to remove the last remaining piece of filament from the loading tubes after a filament spool is completely used up Ejecting during the print 1 Pause print via the LCD menu 2 Select the...

Page 15: ...till be in loaded in the printer s extruder 6 5 Load to the nozzle It is possible to load the filament not only to the MMU2S unit but also all the way to the printer s nozzle This is useful when printing older MK3 MK2 5 G codes on a printer with the MMU2S unit attached So if you have an existing G code for single material printing you don t have to re slice it using the MMU2S Single Mode profile J...

Page 16: ...U2S unit upside down Pict 12 F I N D A 7 Calibration Since the assembly of the MMU2S requires the printer s extruder to be disassembled in the process it s very likely that your printer s Z axis is now shifted It s essential to re calibrate the Z axis and run the First Layer Calibration routine before you start printing 7 1 IR filament sensor calibration The calibration of the IR sensor is based o...

Page 17: ...bration is done If not continue with the next step 9 Pull out the Allen key from the extruder 10 Loosen the M3 screws on the chimney and move chimney little bit to the right side Make sure that IR value is still 0 and continue with step 5 Pict 13 IR filament sensor calibration 7 2 Calibrate the Z axis In your printer s LCD menu go to Menu Calibration Calibrate Z and let the printer run the calibra...

Page 18: ... First Layer Calibration 7 3 First Layer Calibration 1 Load a PLA filament into at least one MMU2S slot 2 Check if your printer s print surface is completely clean Please refer to your model s handbook to learn more about surface maintenance 3 On your printer go to LCD Menu Calibration First Layer Cal 4 The printer will warm up and ask you which filament should be used Use the on screen menu to ch...

Page 19: ...option to tune the nozzle height in real time by turning the knob The aim is to adjust the nozzle height until the extruded plastic sticks nicely to the bed and you can see that it is being slightly squished The value should not exceed 2 000 mm If you have to adjust it more e g 2 500 move the P I N D A probe slightly higher Please refer to our knowledge base in case the P I N D A probe needs to be...

Page 20: ...h of the front PTFE tube between the extruder and the MMU2S unit With the calibration the filament loading will be faster In that case please refer to this manual https manual prusa3d com Guide Service menu Individual Filament Calibration 842 8 First Print First Print checklist MMU2S Unit attached New printer firmware flashed Spool holders and the filament buffer are correctly placed Filaments loa...

Page 21: ...nu to choose the Original Prusa i3 MK3S MMU2S or Original Prusa i3 MK2 5S MMU2S profile 9 1 Importing objects into Slic3r PE STL 3MF AMF Objects ready for multi material printing come in three file formats 1 3MF AMF a prefered format which includes all of the parts in a single file 2 STL several separate files each file for a different part of the object 3MF files are automatically loaded with all...

Page 22: ... in the list 2 In the Object Settings section choose the corresponding extruder filament 3 Assign an extruder to each part of the object Assigning the same extruder to two parts will result in those parts being printed in the same color Once you re done press OK 4 Use the Filament menu on the right side of the Slic3r window to change colors for each part of the object by left clicking the small re...

Page 23: ...t once The size of the wipe tower is independent of the size of the object being printed Printing multiple copies at once or printing big objects therefore improves the overall efficiency of the filament use 9 4 1 Wipe tower placement As soon as you select Original Prusa i3 MK2 5S MK3S MMU2S in the Printer selection box the smart wipe tower will appear in the 3D preview The preview shows its maxim...

Page 24: ... This lets you optimize the amount of wasted filament by for example decreasing the amount to purge when loading black filament On the other hand you can increase the value when transitioning to very light colors to ensure they are not contaminated by previous colors Pict 21 Right sheep has contaminated white color due to insufficient purging By default 70mm 3 is used for both loading and unloadin...

Page 25: ...Unloaded Loaded Black 100 60 White 70 100 Yellow 80 80 Silver 70 70 High gloss filaments 90 70 PVA BVOH 120 100 The Advanced settings let you set the purging values for each combination of filaments in a matrix view E g purge more when transitioning from black to white e g 100mm 3 but purge less when transitioning from white to black e g 60mm 3 24 ...

Page 26: ...iminated completely because some models do not have enough infill but wipe to infill can greatly reduce the amount of wasted material To enable this feature double click on a model in the 3D view and tick Wipe to infill Please note that dark filament purged into infill may be visible through light colored walls To avoid this issue we suggest increasing the number of perimeters Pict 24 Wipe to infi...

Page 27: ...ll be mixed this is handy in case you don t care about the surface color e g mechanical parts To turn a regular object into a wipe object open it in Slic3r double click on the model in the 3D view and tick Wipe to object Pict 26 Wipe object Wipe object taller than the multi colored object The wipe object will be finished with the last filament used during the multi colored print Multi colored obje...

Page 28: ...strongly suggest using Verbatim BVOH support material The second best option is Prima Select PVA both available in our e shop Unfortunately the quality of different PVA brands can vary greatly and we cannot guarantee good results when working with soluble materials from other brands 9 8 1 Soluble support interface only Water soluble filament us usually fairly expensive In order to greatly reduce t...

Page 29: ... print soak in warm water Water soluble filaments must be always stored in dry conditions Soluble supports printing is enabled by selecting the Soluble full Print settings in Slic3r PE Pict 28 Water soluble supports 9 9 Power panic support In case of a power surge the printer will save the current G code instructions position After the power is restored the printer preheat and if necessary the pri...

Page 30: ...filament spool in the on screen menu and confirm it by pressing the knob 7 The printer will load the selected filament and proceed with single color printing Multi material G codes cannot be printed in single color mode The object has to be sliced again and re exported as a Single Mode G code 10 1 Colorprint The web version of Colorprint tool is compatible with the MMU2S Single Mode 1 Import an ob...

Page 31: ...the Festo coupling from the extruder body 2 Unplug the two connectors from the MMU2S board that transfer power and data from the EINSY board a Use an Allen key to push on the connector release 3 Tilt the MMU2S unit forward to unclip it from the frame Pict 29 Unmounting the MMU2S unit in three steps If you wish to print without the MMU2S unit installed there are two possible options 1 The easiest w...

Page 32: ...ease follow these instructions 1 Unload all filaments completely see chapter 6 Loading and Unloading filaments 2 Take all white PTFE tubes and push them through one of the hexagonal openings at the top of the printer 3 Use the middle part of the frame to lift the printer with one hand 31 ...

Page 33: ... All only when MMU2S is connected Load filament 1 only when MMU2S is connected Load filament 2 only when MMU2S is connected Load filament 3 only when MMU2S is connected Load filament 4 only when MMU2S is connected Load filament 5 only when MMU2S is connected Load to nozzle only when MMU2S is connected Load filament 1 Load filament 2 Load filament 3 Load filament 4 Load filament 5 Unload filament E...

Page 34: ...t Z Select language SD card Normal FlashAir Sort Time Alphabet None Sound mute loud once silent Calibration Wizard First layer calibration Auto home Selftest Calibrate XYZ Calibrate Z Mesh Bed Leveling Bed level correction PID Calibration Show pinda state Reset XYZ calibration Temperature Calibration Statistics Fail stats Fail stats MMU only when MMU2S is connected Support Firmware version printer...

Page 35: ...ol holders and buffer To learn how to place everything correctly please see chapter 3 Placement and setup in this guide 2 Incorrect alignment of pulleys Inaccurate alignment of the pulleys results in loading unloading problems and excessive filament grinding by the pulleys and the accumulation of filament dust The pulleys must be perfectly aligned with the filament holes To learn how to align pull...

Page 36: ...cker end of the filament will always get stuck on the sharp edge of the PTFE tube Check their correct orientation the countersink ends of the tubes must be facing out of the unit Pict 32 Correctly placed PTFE tubes 5 Insufficiently tightened screw on the extruder Bondtech gear A loose screw in the Bondtech gear on the extruder motor shaft can cause several problems like issues with loading unloadi...

Page 37: ...can see on picture 33 5 The screw in the Bondtech gear has to be tightened directly against the flat part of the shaft this stops the gear from inadvertent rotation 6 Screw the extruder idler and Festo fitting back Pict 33 How to open idler doors and how to try loosed Bondtech gear 13 1 MMU load failed Blinking red LED If you see the error message MMU load failed on the printer s LCD display it in...

Page 38: ...approximately 20 cm of filament out of the unit and cut this end the gears have most likely damaged this part of the string so it s better to remove it Mount everything back and resume print IR sensor is not working properly or the sensor cable is broken damaged Perform the calibration of the IR filament sensor See chapter 6 1 IR filament sensor calibration Check that the sensor is working properl...

Page 39: ...low flashing fault during filament load Rapid flashing fault during filament unload The print will remain paused until the problem is resolved How to solve a problem related to filament unload rapid flashing 1 Remove the orange white PTFE tube by unscrewing the silver fittings from MMU2S body 2 Check whether there s a filament string stuck in the MMU2S s selector 3 Pull the filament out from the o...

Page 40: ...er is turned off during the printing so the filament is not unloaded properly 1 Using the Allen key press the reset button on the right side of MMU2S unit 2 Wait until the first LED turns green 3 Select on LCD menu option Unload filament 4 Select type of filament and wait for preheat 5 Filament will be automatically unloaded 13 4 All five LEDs blinking red and green MMU2S unit can now deal with a ...

Page 41: ...ove the selector head Remove the broken filament string from the selector and reassemble the unit 13 6 Loud clicking and idler unable to move freely Clicking during the initialization sequence homing after switching on is a common part of the initialization process This is not a problem and is unrelated to this case If the printer makes a loud clicking noise as the selector changes positions and y...

Page 42: ...each Bondtech gears It happens if the filament sensor is not calibrated properly Please calibrate filament sensor as described in section 7 1 IR filament sensor calibration 13 7 Filament cannot go through the selector Selector jam may be caused by 1 The hole inside the selector is blocked by filament tips or strings Solution a Move the selector with the right button on the MMU2S unit to far right ...

Page 43: ... on the material type or manufacturer can look different after the unload procedure They can have a thick end ball end string end etc See picture 37 If you want to get rid of these issues you need to adjust the print temperature which in most cases will solve the problem If the problem persists try to adjust the settings in Slic3r PE to increase the value of Number of cooling moves to 2 or 3 Pict ...

Page 44: ...rt Sensor info If there is no filament below the sensor the F I N D A will show value 0 Insert a piece of filament from the front through the selector and the value must change to 1 13 10 Pulleys covered with filament dust Dirty pulleys cause the filament to slip resulting in problems with insertion and ejection of the filament The best practice is to clean the pulleys with an acupuncture needle m...

Page 45: ...ely stopped The filament will remain loaded in the extruder To unload the filament from the extruder preheat the nozzle first and then select Unload filament in the printer s LCD menu 13 13 MMU2S factory reset MMU2S unit can be reset into default factory values Factory reset procedure will primary delete the filament length calibration values This can be done in the service menu Firmware version w...

Page 46: ...Print and share Do not forget to tag your prints with mmu2s while sharing so we can find pin and showcase them with our http www prusa3d com original prusa i3 prints Happy Printing ...

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