Those are sweet. Hmmm, might have a winter printing project.
I reached out to a guy whose design I pretty much entirely reworked about licensing to sell because a couple people in a local group asked about buying one. He emailed me a release for Creative Commons Attribution only so I'm good to...
We deal with it a fair amount in the off road business since we're not just a bolt on shop and do custom mounts and brackets regularly.
Part of it in that industry is there are only so many ways to put a compressor under the hood of a Tacoma so designs are going to be similar. But my boss did...
I purchased a few parts off Etsy before I got my printer. If I get to the point of selling physical prints that might be the route I go. I'm still new enough to printing though I'm a ways off from selling anything.
I would have assumed that would be a problem with any of the free files places.
I've had to explain to a couple guys in a local RC group that I can't just mass produce and sell them the stuff I've made for myself without getting permission and/or paying for licensing.
The seller is usually...
Might be easiest to set up a group on Thingiverse or another. I would probably go with Thingiverse since most people that print are probably on there in some way and the interface seems more reliable than Cults.