@Hudson Adams I'm very much against this form of supplying wargaming. To be honest, I have friends in the trade who do printing and two of them do Patreon services. After speaking with them, I don't see that it works out particularly well. At the moment printers for amateurs who just wish to print for themselves are expensive and require, as all printers, ventilation and if used to the advantage of the owner, high maintenance.
All my friends have at least 3 or 4 large machines. Some have free holdings with the machines stored in barns or outbuildings. Only one works in a garage. At least one machine seems to be down all the while and the work that they do is varied with only a small amount being modelling. Although they hold the licences for some products.
Each one has advised us that for our humble needs just ring but, although we pay, you can't always get it done when you wish. As a result of not wishing to abuse friendships we now no longer bother. If the system adopted by WGA allows the purchase of any individual item printed to be bought direct by people without their own printing facilities, this would be much better.
Rubicon does not sell files to the public but is starting a marvellous printing service which will see quality items made for tank tracks, spare wheels, jerry cans and multiple spare parts. These items will allow excellent quality conversions and improvements to their models. If WGA goes down this route with heads, arms, spare parts etc., that would be fantastic.
I think, at the moment, there is still poor quality in machines that the general public buy and a Patreon style service asks too much money to be forked out for little return.