8/18/15 Update I've added a new STL version with 'quick release.' This works great if you only need the caliper attachment occasionally. (Note... The rendering shows the updates, but the photos are of the old version) (Please, click the like button if you like it!) I printed this on a Robo3D using MatterHackers ABS. Extruder at 240 and bed at 90. Raft layers = 0, Solid Layers 4 top & bottom. Installation of the caliper requires disassembly to allow the slide to pass through the bracket. No other modification is required, however I did remove the depth rod.