CR10_Caliper-Gauge-Holder

This adapter is based on the brilliant idea of CallJoe: http://www.thingiverse.com/thing:2524206, using a Low Cost Automotive Caliper Buck.
I used his idea to make an adapter to clamp the caliper on the fan-case of the Creality CR10. You can check with it and linearize the 4 corner-points of the heating-bed and compare/adjust the measured "zero" to the (most used) level in the middle of the bed. If the middle doesn't match, tape the "holes" with painters masking tape (mostly 0,1mm), so that all