BCN3D Sigma bowden tube shim

thingiverse

This is yet another solution to the occasional problem with the Sigma printer bowden tube creeping out of the hot-end. I modified a previous creator's post to reduce the amount of plastic and amount of supports, but it was such a design as to suggest a weakening of the bowden tube. It also required to calibrate the printer each time the tube was removed and replaced. Too much work! I recently added (probably inappropriately) to that Thingy a metal shim to replace the threaded fitting:http://www.thingiverse.com/thing:1658562 The shim works great, but the construction was challenging, especially if one has no metal working tools and quality drill bits and a high speed rotary tool. Now that I have a simple design, I felt there was no reason it should be a problem to build in PLA, hence this Thingy. Print Settings Printer: BCN3D Sigma Rafts: Doesn't Matter Supports: No Resolution: 100 micron Infill: anything above 50 percent Notes: Use 0.100 for layer height, as the objective is to have a shim thickness of 0.9 mm. The OpenSCAD code is reasonably well commented (I hope) should modifications be necessary. Post-Printing No cleanup needed Pop the part off the build plate, slide it under the gripper ring. Be sure to push it to the very max, to get the edge of the shim opposite the opening in place under the gripper ring. The side "fingers" tend to splay during insertion, so the shim edge will lift the ring enough to get the fingers under. How I Designed This OpenSCAD makes for easy parametric design, if one uses good code practice. I had it easy, as the previous metal shim was marked with thickness and easy enough to measure the width as well as knowing the hole I drilled was 8.5 mm diameter. Perfect fit on the first shot.