Summary This is for testing how your printer handles narrow gaps when dual-printing dissolvable materials. Print, dissolve, and see if the middle piece can rotate freely. Download the pivot_test_04.stl for 0.4mm gap, or 05 and 0.6 for 0.5 0.6mm gap. If that doesn't fit your needs you can simply download the scad file, change the "gap" value to whatever you desire. The "gap" variable changes the gap size between the pivot and hole, as well as the vertical distance between three square parts. The image is early version of this thing, the gap is 0.4mm and my 0.4mm nozzle Replicator dual handles it well.