The Simple Elegance of the Integrated Timing Belt Loopback Fastener

That center pin looks fragile, especially if it's printed along Z axis. How about printing teeth that'd mesh with the belt?

Prusa Core One uses that technique, or I miss something.

https://help.prusa3d.com/guide/5-corexy-assembly_835522#8648...

This is indeed a very elegant fastening method.

I wouldn't be surprised if the designer of that CNC machine borrowed it from the popular Prusa MK2 3D printer, which uses a very similar design for its Y-axis belt: https://help.prusa3d.com/guide/2-y-axis-assembly_79992#81120

Author appears to have concerns about the belts working out of the top of the housing, but is seemingly ignoring the four existing screws that could be used to fasten a top plate to prevent this?