Prusa launches CORE One skins contest for printable printer makeovers

Prusa has opened a contest that treats the CORE One+ and CORE One L less like finished appliances and more like blank shells waiting for a proper maker’s overhaul. The brief is broad enough to invite real experimentation: decorative covers, themed panels, magnetic accessories, frame add-ons, button covers, small props, or a full transformation into something entirely different.

That wide lane is the point. Prusa said the idea grew out of 3Demon Studio’s March 2026 skin concepts for the CORE One L, which pushed the printer into very different directions, including a TARDIS-style build, a dark steampunk machine, and a mushroom forest scene. The mushroom concept, posted to Printables on March 13, 2026, used a modular magnetic setup with mushrooms, moss, a wooden log frame, and a button upgrade. The model page lists 17 small magnets and 31 large magnets, a reminder that the best printer skins are usually more than cosmetic shells. They are systems.

Prusa also made the contest far easier to design for by releasing the CORE One and CORE One L CAD files under the Open Community License 1.0 on December 19, 2025. The files include full STEP and Fusion assemblies, and the license allows users to download, inspect, modify, and share derivatives. Businesses can use modified or unmodified designs internally, but they cannot commercially exploit the files without a separate agreement. For designers, that means less reverse-engineering and fewer guesswork measurements when building around the frame.

The functional rules are the part that separate a cool render from something you can actually live with on a workbench. Entries cannot interfere with printing, door operation, access to controls, or ventilation. That is the right line in the sand for an enclosed machine, because a skin that traps heat, blocks the front door, or turns a simple nozzle check into a teardown becomes dead weight fast.

The platform itself gives entrants room to go big. Prusa introduced the CORE One L on October 31, 2025 as an enclosed CoreXY printer with a 300×300×330 mm build volume, about 30 liters, or 1 cubic foot, of print space. Prusa says it delivers 200% of the print volume of the CORE One while being only 10% larger. That makes the CORE One L a natural target for showcase skins, especially the kind that turn a stock enclosure into a themed display piece without wrecking day-to-day use.

The prize structure keeps the contest grounded in the hobbyist reality of making things people will actually print. First place gets a Prusa CORE One+ kit. Second place wins 1,750 Prusameters, third gets 1,400, and five entries with the most makes, excluding the main prize winners and honorary mentions, each receive 500 Prusameters. Judging will come down to overall quality, printability, and originality, which is exactly how a printer skin contest should be judged. The flashy render matters, but on a real CORE One, the winning look is the one that still lets the machine breathe, swing open, and get back to work.