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Ultimaker 3 Z endstop guard
A lot of plastic collects at the bottom of Ultimakers over time. When moving the Ultimaker 3, it's quite easy for this material to get stuck on top of the Z endstop, creating issues with bed levelling. I created this guard / ridge to prevent pieces from sliding there in the future.
Created based on manual measurements and the Ultimaker 3 bottom plate 3D model: