* Removed the 3 poles of the holes in the back that accommodate the pins of the more common version

* Adjusted the hole for the TCRT5000 head

* Moved the words to the bottom of the part

* Added a hole and a space for a nut to properly mount the sensor in the carrier

The carrier uses a M2x6 bolt and nut to secure the sensor inside. A washer can be made from cutting off a 1mm section of PTFE tubing. I stacked a normal metal washer on top, so the screw head doesn't just go through the PTFE washer. 

I made a v1.0 after some more adjustments of the TCRT5000 head hole