I love this thing. I have printed it in both PLA and HIPS, and I think the HIPS version came out more consistent. My problem with this thing is that I can't seem to assemble it without breaking one or more of the flanges on the arms. I have tried sanding/filing the openings on the gears so that the pieces will go together more easily, but I seem to always break one. What am I doing wrong? It is frustrating.