31.8 mm Front Derailleur Style Chain Keeper

This keeps your chain from falling off a single ring setup.

There are various STLs which documented the cage profile before I trimmed off the extraneous lines, which I kept in case I want to tweak the profile later.

I never use the 52/53 tooth ring for standard road doubles, & I can't fit a 28 mm rear tire in my road bike because of the front derailleur clamp, so I thought I'd go to 1x & get rid of the front derailleur. I don't have a narrow-wide chainring or a clutch rear derailleur, so I