"engraved" Gryphon flywheel cages

This is a set of four Gryphon flywheel cages with the spacing (e.g. 43.5) directly in the model, visible from the outside. Initially I'd made versions of this with the spacing printed on the bottom of the cage, which was fine before building the blaster, but once it was built you couldn't see it. I've only done four sizes because those are the four that I use personally.