Bear 2.1 linear rails addon + 3dBrain purge mechanism
Description
This is my new step to add MMU to my Bear printer (source project found here: https://www.thingiverse.com/thing:4073421) it's ready for a extruder that uses bl-touch Because of purge mechanism it's no more possible to use couplers on Z stepper then original like Z stepper motors must be used. Due to this change I had to move back to original Prusa Nuts (here because x-end-motor is re-added). 3dBrain Purge mechanism is directly mounted to x-end-idler block. Also because of z mounts are near the bed than prusa right z motor mount has to be different from left to add missing space. *Please note that x-end-motor can also mount an endstop. On my printer I removed the sensorless homing but it's a personal choice, I also added all components to adopt such change*
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