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the original files were in 3mf now converted into STL. 

These will allow you to level your ender 3 and have it keep its level by locking the bed levelling knobs in increments. You need 4 of each model. One fits to the bed frame, the other fits to the bed levelling knobs. The thread pitch of the ender 3 bed screws is 0.7 mm and there are 14 increments per rotation, so each click corresponds to 0.05 mm.