Rectangular Print Gets Warped by Shape of Print Bed
On my Mini+ printer I tried printing a rectangular lid to a Raspberry Pi project box in PLA. After removing the lid from the bed after everything had cooled down properly I noticed it was arched slightly in the middle.
I have tried to thoroughly wash the smooth PEI sheet with dish soap and recalibrate the first layer height. That didn’t help. During printing there are no visible signs of the print detaching and I have tried to print the lid with a 10 mm brim. It didn’t help at all.
I suspect that the shape of the bed and or PEI sheet in combination with the mesh bed leveling makes the extruded follow and arched path to maintain a constant distance from the print surface. As I need to print cuboid shapes that aren’t arched I wonder if there’s a solution to my problem?
Could I raise the print slightly above the virtual “surface” in PrusaSlicer and use supports the eliminate the effect of the shape of the print surface? So that the supports sit between the lid and bed hopefully reducing or removing any arching?
Helpful answers are appreciated. I usually respond to Tweets directed at me.OS: Raspberry Pi OS & Windows 10. Programming Languages: Python & Java
Most warping is due to hot filament contracting as it cools.
If it must be flat the options include annealing, sanding and designing stress relief gaps into the object.
If you make one of the mating parts thin it might conform when tightly fastend.
There is little you can do at the printing stage.
Cheerio,