TUSH2 - rail updated

I just edited the rails made here :
https://www.thingiverse.com/thing:2853619

The original one was too tight and was not able to fit. I gave enough clearance so the spool holder can be adjusted very easily.

I also put the STEP / FREECAD file if you want to modify it.

PS : In your slicer put rotate the part to put the larger surface onto the bed