Improved FolgerTech Kossel Bottom Corner (Motor Mount)

The 'stock' ones were too thick for the t-nuts to clamp the extrusions well, even when cranked so tight that the plastic started to crack. (You could move most of them by hand!)
They were also PLA, and they melted with the heat of the motors. (See the pic with the black part)

I simply thinned the area where the t-nuts mount to give more room for them to clamp, plus I printed my new parts in ABS so they would be more resilient to heat.

When assembling, I also used longer screws to m