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 
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3D printing is extremely more accessible than it was 5 years ago. Most people who go to these craft fairs probably know someone who has, or has access to, a 3D printer. They are available at local libraries in many places. And most importantly, even $200-300 models are very reliable and easier to use now. These businesses are a dime a dozen on Etsy. YouTube has been flooded with videos of people saying "I made X in just one year 3D printing." Since OP knows how to design they probably should have focused on 3D design and printing services for businesses using engineering materials instead of craft fairs.
But that type of 3D printing is already ruled by CNC companies who can invest hundreds of thousands in the equipment, and have CAD experts. But even that has changed, as many companies are bringing engineering printing in house.
Rule of business: don't get into something anyone can do easily. This is why almost all restaurants fail within the first two years.