Help preventing warping while 3d printing with polypropylene I am wondering if anyone can help me achieve a good 3d print using polypropylene. I am trying to print custom insoles for shoes and I'm getting some bad warping/lifting (see image).



Some details about the print and process:


I have a Prusa i3 Mk2S with a Flexion extruder
I am using what I believe is a good quality filament (Verbatim PP): https://www.verbatim.com.au/3d-printing/pp-filament/3d-pp-filament.html
I am coating my hotbead with clear packaging adhesive (OPP tape) as per the manufacturers instructions. This appears to help quite a bit.
Bed heated to 75 degrees. I tried 100 but got hit with the "Heatbed Thermal Runaway" error which I believe indicates that not enough voltage is getting to the bed heater.
I've tried printing at 220 degrees and 170 degrees.
I've tried enclosing the printer in a makeshift enclosure to reduce the speed that the material is cooling at.
Other settings: speed 40mm/s constant, 0.2mm layer height, 20% infill, 3 top bottom and side layers. 


The print takes about 5 hours and seems to stay down for an hour or two before starting to warp.

Does anyone have any suggestions of things I should try?
You should enable the "brim" functionality of your slicer. This adds additional perimeters to the first layer, expanding the base of the model. The larger surface area gives more adhesion.