Massage Roller v2 - multiple rollers - smooth grip

Summary This is a remix from https://www.thingiverse.com/thing:398515 I initially printed the 608 bearing version of the original design. After showing it to my physician, I decided to do a v2 to include all the recommendations I got: wider design (50mm), it easier for larger hands and to apply more pressure rounded edges of the shell, so it smother grip multiple roller designs to address different use cases (my physician prefers the regular spheres) COVID 19 useability: increased tolerance of the shell, so the roller can be easily disassembled and disinfected if you want to use it for professional purpose on multiple people. (Use No bearings roller or 608RS bearings instead of 608 or 608zz). I also added some design improvements: rollers have a built in edge to make sure the bearing is not pushed in too much rollers have a solid core which normally speeds up printing improved tolerances on bearing to shell interface (less diagonal movement of roller inside the shell There is also a &#