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: !functionalprint@kbin.social 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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Pre-edit: I just realized I never actually answered your question. I honestly don't know how most people go about finding someone to design and prototype, but judging by some of the responses here I think we'll get some good advice. Feel free to contact me directly if you want me to look into the draft.
What has been super helpful to me iwhen people come to me with requests is to send me the most detailed diagrams or images of any currently available offerings or a combination of them so I have a good starting point.
As a specific example, someone asked me to design a handheld door lock retainer to practice lockpicking. The overall shape and ergonomic design were up to me, but this image was provided which included very specific measurements for the lock:
Thanks! I found a design on printables, now I just need someone to print me like...200 of them. Hallelujah, no more paying DMC for their crappy product that only kind of works.