X axis caliper mount - prusa i3

Allows you to use your digital caliper to calibrate/test X axis on prusa i3.
Fast and easy, no more slow calibration prints.

Just put the open caliper in the mount, reset it to 0, then move the bed in the direction that closes the caliper. NOTE: make sure the bed move is less than the caliper opening, so that the caliper will not be closed completely, otherwise you can damage your printer.