For easy adjust the higt of the z-end-switch. so i can set the high by diverent coutings af the mirror (blangk/kapton/bluetape) you need the 3 printet parts 1x M3x20 (or loger) 2x M4x50mm 1x M5x80mm 4x M5 nut 1x M5 security nut 1x Spring 9x35mm it is possibe thad you must sand the 1mm horizontal markers in the bottom part, There are different markers at the top-part. 2x smal markers 1x marker with a dot on top and 5 markers (they grow up) at the marker with the dot you must adjust with the screw 0,25mm distance betwen nozzle and heatbed (and fix it with ne conter nut at the top) so you had an offset from -0.2mm to +0,5mm To see the markers bether you can paint it with nail color or an edding.