Mini Differential IR height sensing board attachment to Printrbot Plywood Wade's extruder

thingiverse

This is an attachment bracket for securing the Escher Technologies Mini Differential IR height sensing board to Printrbot's laser cut plywood Wade's extruder, as used on the PrintrBot Plus v1 (version 1303) 3D printer. With this sensor, three pieces of electrical tape are applied to my glass mirror printbed, and some adjustments are made to the Marlin firmware, allowing me now to have automatic bed levelling on my 2012 PrintrBot Plus! I could not find a perfect place to attach the sensor, with space for holes for two screws. As the sensor should measure the bed height with a resolution below 50 μm, it is crucial that it is rigidly attached to the printhead so it does not move. I end up drilling one hole in the plywood piece to the right side of the hotend. To make the attachment rigid, I design these two pieces (one goes on each side of the plywood piece) to prevent the circuit board from tilting, and giving it two attachment points. See the photos. I use M2 screws, the left part has traps for M2 nuts. The holes are made a bit big, because otherwise they ended up filled when I printed them on my printer. The sensor itself is connected to the unused E-stop connector on the Printrboard, and Marlin version 1.0.0-RC8 is used with three point bed measuring. Adding a 'G29' command after 'G28' in the G-code runs the bed levelling procedure before each print. I design this bracket in Fusion 360. How to Design This Bracket The design is made in Fusion 360.