btw, if it weren't for open source and especially copyleft enthusiasts totally driving the 3d printing movement from the beginning, we'd have none of this.
Instead it would be a glut of mutually-incompatible rent-seeking "model stores" crowing about how beneficent they are for "creating a marketplace" (in which they get a cut of all transactions)
It makes me so happy to see that nearly _all_ of the software and designs I have used for 3D printing so far is copyleft! 😍
Designing models:
OpenSCAD: GPL2
FreeCAD: LGPL2
Converting models to printer code:
Slic3r: AGPL3
Cura: LGPL3
The model files for the plastic parts used to build the printer itself (and derivatives like its predecessors and many clones): GPL3
The schematic for the "RAMBO" printer mainboard: CC-BY-SA
Its "Marlin" firmware: GPL3
The firmware used in my keyboard: GPL2+