Prusa i3 Rework Introduction

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Introduction | Bill of materials | Y-axis assembly | X-axis assembly | Connecting X-axis and Z-axis | Motor assembly

X and Y-axis motions | Heated bed assembly | Extruder assembly | Electronics and wiring | Marlin Firmware

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Prusa i3 Rework

Release status: working

PRUSA i3 Front.jpg
Description Prusa Mendel Iteration 3 rework based on the EiNSTeiN VARIANT.
License GPL
Author eMotion-Tech
Based-on Prusa i3
Categories Prusa i3 Derivate, Cartesian-XZ-head
CAD Models gitHub
External Link none

The Prusa Mendel i3 is the third version of the open source 3D printer Prusa Mendel. Our version is based on an aluminium frame cut by water jet cutter and threaded rods. Axis motion is made on linear bearings, belts and pulleys or threaded rods and NEMA 17 motors.

The purpose of this document is to provide a visual guide needed to build a Prusa Mendel i3 3D Printer.

The machine and the assembly instructions are licensed by GPL.

Infobox info icon.svg.png Not Open Source

This design claims to be Open Source, but was found to not comply with RepRap's lowest common denominator about what Open Source is:

Comes with sources sufficient to make a copy.

In particular, at least these item(s) were found to be missing:

  • OpenSCAD (source) files for the printed parts of the i3 Rework are not available on the GitHub repository, which is a clear violation of the GPL license and the Open Source spirit of the RepRap community, and also violates the copyright of their respective original authors. See the "Discussion" tab for more information.

There might be more items missing.

If you want to help improving this design, please find source files for these missing items and upload them to this wiki or link to the repository containing them. Then re-verify wether the above statement is true. In case you can answer this with a "yes", remove this message.


Assembly instructions

Overview of the Prusa i3 Rework.
  1. Bill of materials
  2. Y-axis assembly
  3. X-axis assembly
  4. Connecting X-axis and Z-axis
  5. Motor assembly
  6. X and Y-axis motions
  7. Heated bed assembly
  8. Extruder assembly
  9. CNC Assembly
  10. Electronics and wiring


This design was inspired by older designs:


This design changes several features from its parents.

  • Extruder upgrade: Magma Hotend (by Trinity Lab) support.
  • New cooling fan duct for Magma Hotend.
  • Y Idler with a tensioner system.
  • X End Idler with endstop holder.
  • Upgrade X End Idler in order to support 624 bearing.
  • Y Motor with endstop holder.
  • Addition of Z endstop Holder in situ.
  • Addition of a Dremel FlexShaft Attachment for 3 Axis CNC Milling.

Help and support

You can contact us with the following websites : eMotion Tech or par le biais de la rubrique Contact.

How to get it?

  • printable STL part files are available on Thingiverse and Github.
  • laser/waterjet cut DXF files are available on