3D printing with free software
I would like to experiment with and help my daughter to learn 3D printing. I noticed that on ryf.fsf.org there's the lulzbot printers: https://ryf.fsf.org/categories/3d-printers
They are quite expensive so I want to look for something cheaper - perhaps second hand. But, while I can find 3D printers that are open source hardwarewise, I haven't found information about ones that are running (exclusively) on free software. Also, maybe needless to say, it should be fairly easy to use for beginners.
Any recommendations?
Check here if you find something that suits your needs or a link to such a free software project :
https://www.instructables.com/howto/3D+printer/
This one looks pretty nice https://www.instructables.com/id/Edge-3D-Printer-an-affordable-open-source-3D-print/
I own a Prusa (specificly model MK2). Firmware for all their printers is released under GPL 3.0 . They also have a slicer, PrusaSlicer, that is libre software (forked from Slic3r). Their newest printer, MK3S, is $ 750.00 USD according to their site. They also released a smaller printer (called MINI) by the end of 2019 that is about half that prize (even I think you can still buy MK2 which would also be cheaper than MK3S). You should consider import taxes (if applicable) in the prizes for your conuntry however (I paid about $ 150.00 USD which I did not expect).
I bought my printer as a kit and learned much building it. Building instructions are very clear (you can see them online in their site). I have enjoyed my printer very much. By the way, I had zero experience in 3D printing when I bought it.
Finally, consider visiting reprap.org, in case you decide to build a printer on your own, getting the components by yourself. You can also get kits there from other companies.