improved 3Drag z-axis endstop screw holder

🇪🇺 I've decided to move my 3D models to a different website. The files for this Thing can be downloaded here: https://www.printables.com/model/1233333 🇪🇺

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The standard 3Drag z-axis endstop is pretty inacurate. Just by moving the screw a little to the side, you'll change it's angle and screw up the z zero position - kind of literally.

This improved endstop screw holder let's you place two nuts in a straight line, holding the screw perfectly vertical. You can also use one ordinary nut + on