Summary

my take on arm guards/skids. you print these in TPU and PLA. print the guards in TPU print the skids in PLA. I print the skids with 25% fill but 15 "top" layers that end up being the bottom so you can do lots of skids before you need to print new ones. with this design you tighten the motor screws through only the PLA so you don't have to worry about the TPU squishing out.