Massage Roller

I recently had troubles with a painful muscular inflammation. Using a massage roller did help, but the roller I had was tiresome and clumsy to use. It had a uncomfortable handle that made my fingers cramp up. What I wanted was a massage roller that would fit in the palm of my hand and would not require any grip strength. The result is the device in the pictures. I am quite happy with the result.

I can not stand things that squeak, so I used ball bearings for the roller wheels. I had ssl1790zz (9x17x5) bearings laying around, so I used those. That worked out great, but ssl1790zz bearings are ridiculously over specified a massage roller. To keep cost down I made alternative versions of the STL files for cheap f608zz (8x22x7) bearings. I haven't printed this version, but it ought to work.
Search for f608zz on eBay and you will find a lot of options. Some sellers try to pass off regular 608zz bearings as f608zz, so check that there is a flange at the top of the bearing before you b