Similar to James I think the only solution if your talking cutting parts for other shops is to go out knocking on doors in your area. You likely know the shops that dont have the capacity so there may be some potential that they have investigated and the cost is too much or they are just set in their ways.
There is a lot in the archives here on the subject and I will warn you only of my own experience that it can be a real pain in the butt when you are cutting for especially a small conventional shop that is not really accustomed to machine cut parts and they have ways "theyve just always done it". I never had any intention of trying to panel process for other shops with our machine but it comes up occasionally but its mostly for shops that still hand scratch drawings on a note pad, usually and older guy in the shop that can cut cab parts out of his head, way oversized dados and they shove the mating part to the show-side of the dado, on and on. Some cabs are cut one way because they have a few sheets of xyz on the rack, others are cut another way if there is money in the job, on and on.
It becomes building construction libraries for each shops idiosyncrasies as they are usually in a total state of confusion if their routine is disrupted (faster, cleaner, better registration, more money in their pocket, etc.).
After that they will often times swear they can out-cut the CNC because they are remembering the one butt joint job they did and are discounting all the drilling, edge boring, flubbed parts, and so on. To those I just always say "do you wanna race?"... they immediately back down.
If you have some shops in your area that can feed you fairly clean files that are quick to the machine that would be handy but it this day and age it seems like those shops are already outsourcing or have a machine on the floor.
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