one piece keychain

Any FDM printer should handle one piece keychain just fine. It's been printed on machines like Bambu Lab A1 Mini, Prusa Mini+, Creality Ender 3, most FDM printers. A minimum build volume of 50 mm is recommended.

Nope — one piece keychain is print-in-place, so it comes off the bed ready to use. No supports, no assembly.

one piece keychain is available in STL format. These files can be opened and sliced using free software such as Cura, PrusaSlicer, Bambu Studio, or OrcaSlicer for FDM printing, or ChiTuBox and Lychee Slicer for resin printing. The download is provided through MakerWorld.

Yes, one piece keychain is available as a free download through MakerWorld. Always check the license on the original platform to understand commercial use, remixing, and attribution requirements.