I had a client that wanted to use Optical Endstops on his Ordbot Hadron build. I couldn't find any mounts or flags here on Thingiverse so I designed these to fulfill the requirement.The T Nuts on the mounts use M3 Nuts and screws. I used 10 mm long on the Z axis mount and 20 mm on the X and Y mounts. These are designed to use the screw holes for the original mechanical endstops to hold the flags in place. Note how the optical endstop headers were soldered so they are oriented the same direction as the sensor. The Z endstop is the shorter T Nut file, where the X and Y will use the taller T Nut file. There's a deeper notch in the holder for the X axis than the ones for the Z and Y.