Formbot Trex2 Y motor mount and tensioner

This replaces the Y tensioner and pulley on the trex2 which is pretty poorly designed by default. You'll need to print this in a strong and temperature resistant material. I used pc-max.

I'd recommend getting a 10mm toothed idler pulley for this, though you may be able to use their bearings (untested).

You can likely reuse the bolt and nut from the current tensioner/idler. The mounts for this are M5, so you'll need some M5 bolts and tnuts.

You'll need a 40mm M5 hex bolt for the idler