Simple holder for Shimano cassettes with the lockring. 

Three versions are available:

• 11 speed version
  • Fits road 11 and 12 speed cassettes
  • Any cassette can fit on this version, but anything that's not 11 or 12 speed road will have a gap and so fit a bit sloppy.
     
• 10 speed version
  • Fits 6-10 speed cassettes
  • Fits MTB 11 speed cassettes and some wide-range Shimano 11 speed road cassettes, such as the 11-34.
  • Has provision to hold the 1.85mm spacer needed to mount these narrower cassettes on a wider 11 speed freehub, but it's not needed.
     
• MicroSpline version
  • Fits 12 speed Shimano MTB MicroSpline cassettes

Print in different colors so you can quickly tell different cassette sizes without having to look at the markings or count cogs.

Print instructions

I print at 0.2mm layer height for a 0.4mm nozzle with four shells in PETG. Works in any normal rigid filament, but will probably not work well in TPU or flexible filament.  You can print on a smaller layer size if you really want but you're just wasting time as there's no vertical resolution that needs to be preserved.