I've been able to get dxf files to work in Pycam and Cambam. I've been able to get the g-code and successfully run parts. But when I try to load a STL file from Thingiverse into Pycam it won't load at all. When I try loading the same STL file into Cambam, it will load but when I try to generate the tool path it says "Warning! Can not convert surface to region or polyline". I realize the stuff on thingiverse is really meant for 3d printing, but has anyone reading this successfully machined STL files from that place? Thanks