D-Bot Stepper-mounted Z-axis Endstop

This is a custom bracket that can be mounted above the D-Bot's Z-axis steppers to stop the gantry from lowering beyond 40mm above the stepper. With the particular combination of parts on my build, this stops the gantry at about 325mm of Z height, slightly beyond the spec 320mm.

This is to solve the problem of having multiple Z steppers get out of alignment with each other. I'm running three, which just compounds the potential problem.

To align the steppers, I essentially z-home to zero, then lower the bed 310mm. At that point, I turn down the stepper current low enough to cause easy skipping. It then lowers the bed another 30mm, which lowers all three motors to the Z-stops evenly. Then the current is turned back up, and the bed Z-homed again.

This ensures bed leveling adjustments and mesh compensation stay accurate over time. Even if your controller can't be set up to do it automatically, you could do it manually when you want to verify they're all in alignment.

Install