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The V-Minion is a premium DIY kit for a small form factor Cartesian 3D printer, with big features.

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180x180x180mm Build Volume

Whilst many printers feature an ever-increasing build volume, the most common FDM prints are small. A smaller build volume means less moving mass, leading to faster and better looking prints.

3060 Extrusion Frame

Utilizing 3060 extrusion for its frame, the V-Minion is extremely sturdy. This allows for faster printing with lower vibration, all leading to better looking prints.

Linear Rail based Motion System

The V-Minion features linear rails on all 3 axes, providing smooth and quiet motion.

EVA Modular Print Head System

The V-Minion features EVA for its extruder and hotend carriage platform. This means you can use a wide range of extruder and hotend combinations, outside of the ones we supply. There are many options. EVA allows your printer to be open to updates in hotend or extruder technology in the future: every year there are new hotends and extruders which are released by so many amazing manufacturers. How cool is it that you get to simply re-print your print head and upgrate to a new hotend or extruder?

EVA is a project developped by Paweł Kucmus, read more about EVA in the official EVA project page.

Precision Milled Bed

The V-Minion features a custom made, precision milled, 5mm bed plate designed for exceptional flatness and heat stability. Going one step further, we have worked directly with Keenovo, industry leaders in silicone heaters, to develop a bed heater which is both high performance, and safe due to its built-in thermal protection.

Enclosed Electronics Case

All of the V-Minion electronics fit into the specially designed case. It has been designed to house the power supply, a Raspberry Pi, as well as your printer mainboard, all whilst providing cooling via a built-in 40mm fan. The default design supports the BTT SKR2, BTT SKR Mini and the BTT Octopus mainboards. The side panels are CNC manufactured from 4mm Polycarbonate, making them incredibly strong, but can also be printed if you prefer.

Spool Holder

The on-frame spool holder is designed to complement the V-Minion. Based upon the same 30 series extrusion as the rest of the printer, it keeps your filament close-by and makes moving the printer a breeze because the filament comes with you.


RatOS is developed in-house especially for our printers. It combines the power of the Klipper firmware, as well as several other open-source projects, to provide a stable and easy-to-use operating system for all your printing needs.



Build Guide

The V-Minion has a comprehensive step-by-step build guide in both static and animated forms. Each section is broken down into easy to follow steps, detailing the parts needed and how to assemble them. A fully animated build video is also provided, should you wish to see exactly how each part is designed to fit together.

Rat Rig Community

Rat Rig maintains an active user community on Facebook where you can connect with other users of Rat Rig products. Come join us to share builds, knowledge, mods, and stay up to date on all current and future products.

Rat Rig 3D Printer Community

Sample Prints / Parts

These images showcase 3D prints produced by V-Minion machines belonging to members of our community. Clicking any image will open the full size version.


The V-Minion is an open-source project which is a result of countless hours of collaboration between our design team, the 3D printing community, and our beta team, all of whom share their knowledge freely to help push the 3D printing space forward as a whole. Being developed by using such a vast array of knowledge means that it is difficult to trace back any one idea, thus making attributions difficult at best. Regardless, we would like to acknowledge the following people and projects for their contribution to the V-Minion. They are as follows (in no particular order):

  • Paweł Kucmus
  • João Barros
  • Eduardo Oliveira
  • Tomasz Paluszkiewicz
  • Mikkel Schmidt
  • Antonios Antzoulatos
  • Detlev Meinhard Friedrich Rackow
  • Lukas Sinitsch
  • Márcio Pereira
  • Dennis Jespersen
  • Marc Marschall
  • David Menzel
  • Thomas Ret
  • Mihai Stanimir
  • Harald Wagener


Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International

You may share, remix and mod the design. By default, you may not use the design and its derivatives for commercial purposes, but if you request a commercial license from us, we may (and most likely will) grant you one, as long as we deem your goals are aligned with the best interests of the project and its users.

The spirit of the project is to remove barriers to innovation and focus on pushing the technology, working as a collective, inspiring each other and experimenting with new ideas. We are happy to foster a rich ecosystem of suppliers and services that empowers users by offering them more options and alternatives.

Request a Commercial License