Innovative and very high accuracy adjustable Endstop for Reprap Prusa and other models

by paolo68, published

Innovative and very high accuracy adjustable Endstop for Reprap Prusa and other models by paolo68 Jan 20, 2013
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This very simple tiny Thing allows a quick and very precise calibration.

This innovative approach consists in:

  • FIXING the endstop once and forever to the printer structure.
  • Doing the calibration by means of a small and accurate M2 screw (0.4 mm per turn) mounted on the part that moves towards the endstop.
  • Enjoying NO PLAY/slack.

Sample application - Prusa i3 Z-axis endstop (see pictures):

  • Z-Endstop fixed to the metal frame.
  • Thing holding the M2 screw fixed to the bottom of the right X-end.

Note: I have removed the metal lever from the endstop, leaving just the button; this improves the accuracy.


Print the uploaded STL file. If needed adjust the size parameters in the OpenSCAD file.

Additional hardware needed:

  • 1 x M2 screw
  • 1 x M2 nut
  • 2 x small wood screws

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You are absolutely right, done already (this is an old picture, sorry for that)

File the end of your screw flat, the deformed end from the rolled threading makes for uneven adjustment - as the screw rotates a different part of the 'point' makes contact with the switch button.

You are absolutely right, I have done it already (this is an old picture, sorry for that).

this one is probably the simpliest

Agreed. You're not only with Z-endstop solution.

There are enough solutions for Z-endstop already on Thingiverse.

Adjustable Z Endstop for Prusa
by kwixson
Adjustable Z Endstop for Prusa Mendel
Really High accuracy adjustable Z Endstop for Prusa
by jedynak

You are right, there are many solutions around, however so far none so simple, with such a fine resolution and without play/slack.
I think that most people concentrate on devices to move the endstop itself, while I FIX it to the structure; then I tune a screw mounted on the part that moves towards the endstop.

Your approach is the best option for our Prusa i3 (single-plate) which has plenty of space on the frame to attach a fixed endstop. And it's a lot easier to move the printer around without having any additional clips affixed to the z smooth rods.