MakerFarm Prusa i3 Servo Z Endstop

by CapnBry, published

MakerFarm Prusa i3 Servo Z Endstop by CapnBry Oct 20, 2013
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This is a replacement part for the MakerFarm Prusa i3 X carriage that adds the ability to mount a servo and microswitch to be used as the Z endstop. With this new "Z probe" the bed can be probed and autoleveled using the G29 function in Marlin.

The servo mount accepts an SG90 or MG90S 9g microservo. Insert the servo through the hole, add the printed arm (with the inset facing away from the servo), and insert the servo arm into the inset. Secure with the servo's screws and you're ready to go.

Designed to be printed with 2x 0.66mm walls, tested with 0.30mm layer height.

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Thanks for this one, Bryan!!

Does this design hit the wood on the left side of the x axis? I am currently using one that holds the servo horizontally and I lose about 12mm of print surface in the x direction.

No it does not hit the X end on the Z tower. It is designed so that the server slips in front of that piece with a decent amount of clearance to give you 100% of the X axis travel.

How do you wire up the servo to Ramps and does the firmware activate the servo?

There is a row of 3 pin connections on the RAMPS 1.4 labeled "servos". They need their own 5V power source applied at the 5V pin on the other side of the reset button. This is because even a small servo can pull an amp of power which the regulator on the Mega would not be able to supply (and it is not even connected because of this).

In Marlin you need to enable SERVO_ENDSTOP for your Z axis, as well as adjust any setting in the autolevel section of the config. My autolevel offsets are X=20, Y=0, Z=-3.90