Positron3D’s Prusawire Documentation
An unofficial Prusa MK3 and MK4 to Switchwire total conversion mod, from Positron 3D’s April Fools of 2025.
Current Release
Beta 1 (2025.B1) was released on 2025-08-21. There have been updates and improvements since then. Be sure to grab the latest STLs and documentation from the GitHub Repository.
Beta 2 is coming SOON(tm).
About
Nomad of Positron3D came up with this idea shortly after completing their Switchwire build. The idea started as a quick design exercise, to try and convert a Prusa MK4S frame into a Switchwire, using everything left over from a CORE One Upgrade.
As the first iteration wrapped up, I took interest in the project, and decided to take this April Fools joke one step further and build it into a reliable machine.
After months of hard work, please enjoy the build ❤
Who This Printer is For
Pick one of the following:
- You have an old MK3, MK3S, or MK3S+, and you want to teach an old dog new tricks and are on a budget
- You upgraded from MK4S to a Core ONE, and have a leftover frame. You are okay spending money on building a new printer with that hardware.
Additionally, the following says this printer is for you:
- You want to take your first steps into RepRap beyond Prusa, and Voron is an exciting route.
Technical Support
Prusawire, technically, does not count as a Voron Switchwire. We ask you kindly not to nag the Voron Design team for technical support.
Instead, please join the Positron3D Discord for support with your build, and maybe share your progress over there too.
Serial Numbers
We are accepting serials over on the Positron 3D Discord. Please submit your request to the #prusawire-serial-request channel over there.
Want to Support the Project?
First of all, thank you! Development costs have been mostly self-funded, with filament sponsored by Levendigs, and LDO Motors for providing the funds for the Prusa MK4 frame.
- Support Positron3D to fund future endeavors:
Credits
Many thanks to all the awesome people and companies that have made this possible.
Most importantly:
- Ella Fox, the architect of Beta 1 - who took Prusawire from a joke to a beautiful and powerful machine. Buy Ella a Ko-Fi
And also:
- Prusa Research - Cheers, Josef and the team for the MK3/4 platform on which this was built upon!
- Voron Design - Switchwire
- Positron 3D Team - Too many to name, you know who you are <3
- Early development team:
- Nomad’s Galaxy
- Koosh
- Birb
- Jason @ LDO Motors - Part sponsorship
- Levendigs - Part sponsorship
- Early access testers:
- Killa_Prints
- LinksLab
- Safe
- Silicon
- TheNexusAvenger
- torsten
- Contributors since Beta 1
- einarjh
- erikbuild
Team
Prusawire is currently maintained by the Positron 3D Team.
- Design Lead: @Safe-ty
- Documentation Lead: @erikbuild