Z-Motor Brake for 3D-printers with NEMA17 steppers
Description
Z-motor brake that prevents build plate from sinking by it's own weight, when power is off the Z-stepper. This can be useful during filament change and recovery after power loss. (A version for Ender-4, Integrated with Z-motor mount, can be found at https://www.thingiverse.com/thing:3449383) Brake arms are mounted floating, so there should be no influence on printing quality. Mounting: Assembled Z-Motor Brake with 2 x M3 x 18 and 2 x M3 nuts. Be sure everything moves freely. Unscrew two of the M3 screws that hold the NEMA17 stepper motor. Mount the assembled Z-Motor Brake with the screws. You may need a couple of longer screws. Place a spring on the tip of the two brake arms. It should only apply enough force, to prevent the build plate to sink by it's own weight. Needed Parts: 1 x Mount_XXmm.stl (where XX is the distance from mounting surface, to the center of the flexible coupler. Mount_12mm.stl will properbly work.) 1 x Break Shaft Lid.stl 2 x Breake Arm-XX.stl (where XX is the diameter of the coupler on the Z-axis) 2 x M3x18mm 2 x M3 nuts 1 x Spring of some kind, that pull the brake arms gently together. Only a low force is needed. You may also need 2 x M3 screws at bit longer then the ones used to mount the stepper motor.
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