Was playing with one of my Hobbies and thought it would be nice to make a line following robot. I had made the Round Robot last year. It was in the Arduino Robot Bonanza book written by Gordon McComb. The authors name for the original robot design was the "Teachbot". It is a great book for learning both Robotics and Arduino coding.
I had both the IR emitters and the IR photo-transistors but no way to mount them on the robot. This mounting bracket was designed to fit the front bottom edges of the round robot. Even though the bracket holds four pair of emitter/detectors, I was able to get by with only using the two center ones
It is not necessary to use supports when printing the top to the case, but I wanted the printed top to be the last part printed so I put support on the under side. I could have just flipped the case top over and printed it upside down, but did not want that flat printing texture you get from the bed.
In the pictures the Line Follower Bracket is Black PLA, and the Line Follower Bracket cover is Red PLA
I did some bench testing of my components first before designing the case. The case is designed to hold four sets of IR emitters and IR photo-transistor in the four rows (3/8" spacing between rows).
The Emitters and Photo-transistors are all 5 mm holes. These items were just friction fit into the lower part of the "line follower bracket". I used ribbon cables out the back to run between the mounting bracket and the top breadboard.