BCN3D Sigma bowden tube shim

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:
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