root cnc upgrade y gantry motion link upgrade

here's a fix for movement on the y gantry motion link to keep the cable on track.
printed at 25% with no supports.

I'll add some photos soon and am currently working on some other mods for the cnc.
so far here are some other upgrades
y gantry motion link upgrade
https://www.thingiverse.com/thing:2840194
x axis belt tension for hdc m3 belt
https://www.thingiverse.com/thing:2843819