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applications, this will not provide sufficient curing to meet the requirements for mechanical properties, surface tackiness, color,
or long-term property stability. Whenever possible, it is best to cure parts off the build plate to ensure all part sides receive
uniform light levels during curing.
Curing parts on the build plate can be done for both SLA and Figure 4 materials. When printing multiple parts on the same
build plate, maximizing part spacing can provide a significant difference in the amount of light that reaches the sides of the
parts. Part spacing does not significantly change the amount of light reaching the bottom of the parts. Increasing the support
height significantly can provide a small improvement in light levels reaching the bottom of the parts.
For some workflows, it may be preferable to do partial curing of parts on they build plate (via a customized recipe), then remove
parts and fully cure them off the build plate. For some applications, this can improve surface quality of parts (reduced handling
marks) while achieving full mechanical properties. For some applications, this can also reduce distortion seen when parts are
cured off-plate from a green state.
For some workflows, customers stack print arrays of small parts known as stacked printing. This workflow provides the highest
density of parts possible for a single print job. Unfortunately, this high density makes it difficult for post curing on the build
plate. For stacked printing, it is recommended parts be cured off the build plate. If this is not possible, it should be expected
that there will be a larger variation in curing part to part. Parts on the outside of the array will receive full light intensity on one
side while parts in the center of the array will receive minimal light.
6.2.1 Drying Parts Inside PostCure 1050
CAUTION: Parts must be surface dry before placing into the PostCure 1050. Never place parts in the PostCure
1050 with surfaces wet with IPA or any other flammable solvent. Blow off wet surfaces with compressed
air to remove all liquid from part surfaces. The Drying step inside the machine provides an automated and
consistent process for removing IPA or other evaporative solvent that has penetrated into the resin structure
during cleaning. If this residual solvent is not allowed to dry out of the resin structure prior to post curing, the
part properties could be significantly out of spec.
To improve workflow efficiency, part consistency, and reduce handling, the Post Cure 1050 provides an optional drying step
prior to curing. Place surface dried parts into the Post Cure 1050 with sufficient spacing to provide good air flow during drying
and to provide minimal part to part shadowing during curing.
The default drying time is set to 30 minutes. This time can be increased or decreased in the Customize Recipe screen. The use of
the drying step can be turned on/off in the Cure Options screen.
6.2.2 PostCure 1050 Cure an SLA Print Platform
SLA customers who print both epoxy based formulations
and non-epoxy based formulations have higher print-platform
cleaning requirements to ensure cross-contamination does
not happen. Since SLA print platforms are used in the SLA
printer for both types of formulations, it is normal for
customers to place cleaned SLA print platforms into their
post-curing device to cure any remaining resin residue before
using the print platforms in the printer. Fully curing cleaned
SLA print platforms is part of the recommended process to
ensure cross contamination does not happen.
Customers can use the PostCure 1050 to cure cleaned SLA
print platforms. Place cleaned SLA print platforms on the base
glass and/or the middle glass shelf (if installed).
Select the Special Recipes List on the user screen. Choose
the recipe called SLA Clean Print Tray Cure Standard. This
curing recipe should provide good results for most situations.
Customers can adjust the curing recipe parameters to meet
their needs.
6.3 PostCure 1050 Firmware Update
To update the machine firmware:
3D Systems, Inc. 44 p/n 40-D177, Rev. A