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EVA Carriages


EVA is a platform for MGN12 and MGN15 rail based 3D Printer carriages. Mainstream support fouses on Rat Rig 3D printers but it's customizable enough to support different systems.

If you are looking for guidance after you decided to use EVA Getting started is probably what you are looking for.

Rather lenghty video descriptions can be found on the YouTube playlist.


This manual is full of links to specific parts, but there is no need to download those one by one the full repository can be downloaded as a ZIP file.


Big thanks to the users - one example is that only thanks to your donations the Mosquito parts were possible.

If you want to support the project or just buy me coffee you can

The project also received or receives continous support from the companies we all know. Big thank you to:

Rat Rig Bondtech

Please go and buy something from them :)

MGN12 and MGN15

All listed assemblies are pointing to MGN15 variants but a smaller (and probably better) MGN12 variant is now also available. MGN12 is lighter so it's a good choice for a CoreXY system to make the X rail assembly lighter. Both variants are fully compatible with each other, which means that you only need to change the MGN rail, your top and bottom parts and you are set.


For Rat Rig V-core Pro the Easy Mod is required to change the X and Y rail orientation.

EVA is now officially used by Rat Rig in their products 🎉 :


Issues, problems, feature requests, requests for compatibility with different printers can be requested in the project's issue tracker.


One does not need a keen eye to see that this design is based on many different designs that are out in the wild - although all the parts here are made from scratch - their authors deserve credit (their work provided inspiration):

The following people deserve special credit for their amazing work - making some of the parts, providing guidance, testing parts, keeping me in check. Their input was a huge help so please do me a favor and check out their work:



If you need a more direct contact I'm on the Rat Rig Unofficial Discord Server.