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WOW. This saved my printer. My printer would print fine on simple blocks and straight things, but whenever I tried to print something more complicated it would shift layers really bad. I tried to tighten my belts but I just couldn't get them any tighter. I printed this and put it on my Y belt and It fixed immediately.
Thanks so much for thinking of this! It saved me a lot of frustration.

HICTOP Prusa i3