Optical sensor for BAL

Support for an optical sensor I made for my 3d printer. There is more explanation on a youtube video (in portuguese) here: https://www.youtube.com/watch?v=thTcLVUdXvY&t=6s

A discussion about this probe can be read at (in portuguese):

https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/reprapbr/ZjvedNwPv8k/KmZ8Rpo4AAAJ