Best chance to reduce PETG warping
Recently, i updated my MMU2s to a MMU3 and went through the corresponding process of printing out the upgraded parts. One of the gcode's (supplied by Prusa caught my interest, MMU3_UNIT1_MK4IS_8h32m.bgcode (from here https://www.printables.com/model/531604-mmu3-printable-parts/files in the MK4 section).
After seeing the odd pattern print (many squares from layer 1 removed, with corresponding placeholders filled with a rotated infill in layer 2), i hypothesized that the purpose of the extra complexity it to mitigate some of the risk of the part warping (when printing by customers) by performing some type of stress-relief on layer1.
layer1 below:
layer2 (note deviating infill angle inside the square, matching infill inbetween 4 squares):
Is anyone aware of a post that further describes this technique? Is my hypothesis (purpose related to warping) seem reasonable?
Thanks!
RE: Best chance to reduce PETG warping
That is well possible. The different directions require different phases in the print and variation of the direction of shrinkage. Maybe it is not so much warping in itself that is reduced, but relaxation of the first layers and thus better adhesion and reducing the chance of separation and warping.
It is a full plate and if represents more than 8 hours of production capacity of a printer. It is not something a production company wants to take chances with.
RE: Best chance to reduce PETG warping
The rotating infill in layer 2 could indeed be designed to counteract potential warping by distributing forces more evenly.
RE: Best chance to reduce PETG warping
I noticed the unusual pattern on my MMU3 parts out of the box. I, too, wondered about the reason. My guess was not so much to prevent warping but to reduce adhesion so the parts will release faster so another print cycle can be started sooner.
MK4S/MMU3
RE: Best chance to reduce PETG warping
That’s an interesting take. Ty
RE: Best chance to reduce PETG warping
I was wondering, if there are design tricks like...
Did anyone come across reading/video on idea like this to improve designing and/or print settings?