One of the brackets for my speaker stands broke when a pint-sized visitor to our house gave the attached speaker a tug. I performed a field-expedient repair using duct tape and a zip tie, but it looked like trash, and given that I do have a 3D printer, I figured I would try my hand at fabbing up a replacement. After getting the critical measurements and hacking it up in Sketchup, this is what I came up with. This will fit any stand with a shaft diameter of ~13 mm, but specifically fits these: https://www.monoprice.com/product?p_id=3022

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2020.09.30 UPDATE: Added a v2 with a thicker collar as one I printed in PLA failed where the collar meets the bracket. The later iteration has held up for several months, so it should be good to go for PLA. The first version is probably fine if you are using ABS.