I had printed the rail designed by BacoTell99, but didn't like that it left a lot of gap between under the rail where the CPX-2's top is beveled. I cleaned up the geometry some, added the bevels to match the top, and removed the need for a set screw. You need to print both halves and press one in from each side. It should fit very tight on the top of the CPX-2 now. Your red dot's clamps will hold it together. You can glue it in place if you like, but with the redesign, I don't think it's necessary now. Print with the inside faces down at 100% infill. No need for supports but a brim might be helpful to keep it on your bed.

TronXY P802M

No

No

.2mm

100