Automotive Caliper mount for Petsfang Bullseye Creality Ender-3

Adapted from https://www.thingiverse.com/thing:2524206. His great idea inspired me to add this mechanism onto the Creality Ender 3 Petsfang Bullseye mount. Everything work fine! Mount the accessories, located one corner and press the caliper to Zero point. Then slowly move the head to each corner, and slightly tap on the caliper (due to the caliper is without spring feedback). Adjust all corners to have the same value, and you are good to go!