Lidar Encoder Pulley

Showing off the encoder pulley I just modeled. I've still got some sizing estimates to deal with, but it's getting pretty close. There's probably not enough clearance on the inside still for wiring, screw mount and top of arm enclosure.

I need to build the design the lower mount and encoder sensor arm. I decided to go with the standard H21A1, just like how some older smoke alarms work. I added a channel to mask the led and sensor of the other optical interrupter.