This is a parameterized FreeCAD model of the BearingPeg I created from the Prusa MMU2 tray bearing.

This publication includes several different versions of pegs based on observations I've made and comments I've received. These were all made using the .FCStd file which demonstrates is the complete interactive FreeCAD model.

History

I ran across a download for a part I needed that included a FreeCAD model and talked about customization. I was curious as to how they had customized a FreeCAD model and surprised when the changes I made to the spreadsheet were instantly reflected in the view.

Version 1.0 of the BearingPeg was a Proof-Of-Concept that worked so I printed five and was done. I thought about making a shorter peg and really liked the idea of a single hole version but couldn't justify the effort.

Customize

After seeing that an interactive model was possible in FreeCAD I decided to see how hard it would be to parameterize my BearingPeg. The final results are simply amazing.

Everything can be changed!
-Bearing Size
-Axle Size
-Width
-Length
-Hole Separation
-Spool Bearing location
-more...

See for yourself - A demonstration and description of all the properties

Summary

If you use FreeCAD, even if you don't need a wall peg, it is worth downloading the .FCSTD file to see an interactive FreeCAD model in action. I was able to do everything using just the standard FreeCAD installation.