This is my first project on Thingiverse - its a belt tensioner for X axis in Anycubic I3 Mega.
You only must make a 5mm hole/bore fot M5 screw - you can use a "x_TENSION_4" bracket to mark posiotion a hole.
Screw/nut with you need:
M5 screw - 35mm or more
M5 nut - best is self-locking
2x M3x16 or more (but not to long) screw
2x M3 nuts - best is self-locking
1x M5 washer
Its easy to print and easy to use when you need change belt.
Project is some mix about Y-tensioner by ltlowe (thx man ;) ) https://www.thingiverse.com/thing:2789837