Shim that adapts the much more common 1.125" (1 1/8") threadless stems to clamp on to 1" steerers.

Cut down to match the height of your stem, or if smaller, make it the largest percentage below 100% possible. It would be much better to just go in the SLDPRT & extrude it further, then remove the excess.

Do not just leave this larger than the height of your stem or else the threadless adjustment doesn't actually work. Use 1" headset spacers (I uploaded these) for the rest of the steerer. If you leave it larger, the cap may compress shim against the bearings through the compression ring too much & give you terrible steering quality.

Never tested/printed. Use at your own risk. The plastic probably doesn't have enough room to deform & crack, & I think it's pretty good in compression, but it could break & prevent you from steering your bike, which is bad. Aluminum shims are readily available cheaply, so I would prefer to stake my life on those instead.