If you can do a version with 5x6mm ball detent it would be really convenient. It's hard to buy from OOD from outside the US, and they're expensive. Bambu printers sell the 5x6mm in their Maker's Supply hardware store, very cheap (like $2 for 10), and global. (EDIT though I just did it myself from the CAD file, thanks for providing STEP, it's very helpful). (edited)
Using printed bushings until the POM bearings arrive from PRC. Design works, but with caveats.
(1) Pull grip is physically weaker than the original. The screws tap into plastic, no captive hex nuts of the orignal and too thin for most heatsets. Some of the walls are thin as well.
(2) Top rail is a little loose, you can fix this by drilling a hole in the bottom and securing it to the top bar with countersunk set screws. You must do this if you want to usefully mount an optic/laser/camera on the front rail. (EDIT This is very difficult to do due to the thinness of the rail, so I would just treat the front rail as cosmetic or use glue; on the original rail, this drilling is easy).
EDIT: (3) After bolting down the rail, I just tried to attach a scope and recoil slots on the pic rail do not align with the upper (see the OP's photo and zoom carefully where the rail joins the upper magwell). Mine is ths same. So basiclaly, yes, this works to prime, but the top rail needs work. (edited)
Haven't exactly had the chance to fully put it through its paces but it was easy to print, fits snugly, matches the aesthetics of the blaster, and imparts a spin on the darts. Can't really ask for more.
