Another category of 3D printable websites.

Here to signal you another category of 3D printable sites, the individual creator portals (sort of like Patreon but for one creator only) like;

https://3dmential.com

Cons;
Everything is for pay most of the time, noting for free, I agree sometimes the price is low, but still... not free.

Products of one creator alone, not a big host of creators to pick from.

There is no forum most of the time, so you can only interact with the content creator, annoying, right?

While all of the STL files for sale have being 3D printed more than once, most of the time is on the heavily modified machine of the content creator, which has no other twin on the planet, hence printing on whatever you own might require some tweaking with your slicer settings.

Also while you can hire the content creator to engineer, print and test for you something you and only you need, hence your intellectual property in the end (not cheap process thou), you cannot expect similar work done for third other parties to be available to pay cheap for in the portal, I guess you would not want your expensive experiment that came to a good end to be cheaply made available to just about anybody either, or maybe you do, cheers to you for that.

At this time I cannot personally think of any pros for visiting such a portal, but if you come up with some be sure to let me know.