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Prusa CORE: OneCAD data is out – but under a new flag!

Good news for all makers and optimizers: Prusa has released the complete CAD files of the frames for the new CORE One and the CORE One L. So if you've always wanted to take a virtual look under the hood or are planning precise accessories, you can now download the STEP files and Fusion assemblies.
December 28, 2025 by
Prusa CORE: OneCAD data is out – but under a new flag!
MEER 3D Technologies

Good news for all makers and optimizers: Prusa has released the completeCAD files of the framesfor the newCORE Oneand theCORE One LSo if you've always wanted to take a virtual look under the hood or are planning precise accessories, you can now download the STEP files and Fusion assemblies.

But the real bombshell lies not in the files themselves, but in the fine print.

The "Open Community License" (OCL) – What is that?

With this release, Prusa is moving away from classics like GNU GPL or Creative Commons and introducing theOpen Community License (OCL). Why? Because classic software licenses often do not fit one-to-one with physical hardware.

What is allowed:

  • Learning & Analyzing:Take a look at how the professionals constructed the frame.

  • Modding:Create your own extensions or modifications.

  • Spare parts:You are allowed to make parts for your own machine (private or commercial) yourself.

  • Workshop Planning:Integrate the model into your digital layout.

This is taboo:

  • Commercial reproduction:You may not sell complete printers (or remix kits) based on these files without a contract with Prusa.

Focus on "Right to Repair" and AI protection

Especially interesting: The license contains explicit clauses regardingRight-to-Repairand simultaneously protects the data from unsolicitedAI data mining. Prusa makes it clear: Whoever buys a printer owns the hardware and can do what they want with it. The license solely regulates the handling of the intellectual property of the digital plans.

My conclusion

Prusa is trying to strike a balance here: The community gets the resources it needs for modding, while "copycat manufacturers" are legally restricted. Whether the OCL will establish itself as a new standard in the industry remains to be seen.

What do you think of this step? A fair deal or too restrictive? Let me know in the comments!

Anyone who wants to take a direct look at the construction or start modding can find the files and all the details about the license here on GitHub:Prusa CORE One - Full CAD Assembly
Goodbye Single Color
For years, private 3D printing was primarily a single-color affair. Those who wanted more colors in their model had to either pause the print and manually change the filament – a tedious and often error-prone procedure – or rely on complex single-nozzle systems that allowed for color mixing but came at the cost of significant material waste (the "Prime Tower") and long print times.