Open-source still struggles with quality and consistency -- two things important in a medium where aesthetics are important.
That said, access to low-cost, high-resolution 3D printers (specifically resin-based printers) has enabled an explosion of the open-source Warhammer community (see https://www.reddit.com/r/PrintedWarhammer/ for one example) -- and oddly, it's exactly the free market that is allowing this to flourish through services like Patreon, where artists are financially rewarded by supporters who receive a steady stream of fresh new .stl's on a regular basis.
Open-source Magic the Gathering has struggled a bit, but there are still a good number of fan projects that have done very well. In particular, open-source game clients such as XMage have been open-source competitors to MTGO, and open-source fan-project expansions such as Star Wars: The Gathering have managed to keep a high level of quality and consistency: https://www.starwarsthegathering.com/
That said, access to low-cost, high-resolution 3D printers (specifically resin-based printers) has enabled an explosion of the open-source Warhammer community (see https://www.reddit.com/r/PrintedWarhammer/ for one example) -- and oddly, it's exactly the free market that is allowing this to flourish through services like Patreon, where artists are financially rewarded by supporters who receive a steady stream of fresh new .stl's on a regular basis.
Open-source Magic the Gathering has struggled a bit, but there are still a good number of fan projects that have done very well. In particular, open-source game clients such as XMage have been open-source competitors to MTGO, and open-source fan-project expansions such as Star Wars: The Gathering have managed to keep a high level of quality and consistency: https://www.starwarsthegathering.com/