Hello -- I'm trying to convert the scad file for use in FreeCAD which is capable of doing the conversion. For my use, I need to add openings in the top and remove the side openings since my cart doesn't require this. Unfortunately, The bottom side edge comes out missing the radius after conversion in FreeCAD. Since I'm not familiar with OpenScad, I don't know how to fix the model. Curious if anyone has ran in to this and has a FreeCAD model of this cartridge? Thank you for a great design!