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It’s an established file I found on Thingiverse. Here is a link. There are others on that same site to choose from. I liked this one because it has interchangeable wheels.

It has wheels for 3/16”, 1/4”, and 3/8” (and 4-6-10 mm), but none for 5/16” tubing, so I needed to create one wheel in Fusion 360. If you use only three wheels, it will make bends.

There is one change I would make. It has no handle or clamping point for a vice. I may redesign it to add one.