3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: or !functionalprint@fedia.io
There are CAD communities available at: !cad@lemmy.world or !freecad@lemmy.ml
Rules
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No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
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Be respectful, especially when disagreeing. Everyone should feel welcome here.
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No porn (NSFW prints are acceptable but must be marked NSFW)
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No Ads / Spamming / Guerrilla Marketing
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Do not create links to reddit
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If you see an issue please flag it
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No guns
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No injury gore posts
If you need an easy way to host pictures, https://catbox.moe/ may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is 
Moderation policy: Light, mostly invisible
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Have you considered lasercutting or CNC milling as well? And what about lithophanes?
3D printers are highly accessible to people, even people with no technical knowledge can just buy one, download models and have it print successfully. Selling 3D printed parts pretty much only works if you do design as well and not many people request something like that. I don't think you can make a feasible business out of 3D printing alone.
And there is mechanical design and aesthetic design, which both are completely different practices. I mean things like making a TV mount or a tube holder vs making a detailed Warhammer 40K model. You need different software and skills for both of them and it consumes a lot of time to do well.
CNC milling and lasercutting is not as wide spread as 3D printing is so you could still end up finding people interested in objects made this way.