Clamp for 12mm linear rail with opto endstop mount

A version of my clamp for 12mm linear rod with mounts for an opto endstop board commonly available on aliexpress.com.
There is two stl files. one with round mounting holes and one with slotted mounting holes to allow a small amount of adjustment of position.

requires:-
1 x M4 grub screw to clamp rail, a grub screw is prefered to provide clearance for the opto wires
1 x M4 injection nut for clamp part
2 x M3 injection nuts for opto board mount
these must be pressed into place with a hot