This is an interesting point (taxation, or licensing fees) that I'm not sure others have brought up before. However, it is a logical extension to the idea that once a review/ban platform is in place, you could then pay a "fee" to the right people to let you print the desired item.
Let's assume that they're not blatant enough to slap on something called a production tax. Instead let's assume they're going to pass an "Environmental Recycling and Recovery Fee" and a "Emissions Control Fee", because, California, which of course, are just another form of production tax.
But frankly they could just do that by slapping those fees on filament just like the music industry got a tax passed to tax recordable media.
"The Audio Home Recording Act of 1992 (AHRA) amended the United States copyright law by adding Chapter 10, "Digital Audio Recording Devices and Media". The act enabled the release of recordable digital formats such as Sony's Digital Audio Tape without fear of contributory infringement lawsuits. "
https://en.wikipedia.org/wiki/...
I guess in the case you are proposing, then certain types of 3D printed shapes would be worth more than others? And who would define the prices, and who would get the revenue? I'm reminded of fraudulent music copyright takeovers on Youtube:
"The MediaMuv scam is not unique. YouTube scammers commonly claim a small percentage of song royalties, hoping to go undetected by targeting songs with multiple rights holders who likely arenâ(TM)t aware of how many royalties are being collected. However, MediaMuv was more âoebrazen,â Billboard reported, âoeoftenâ claiming âoe100 percent of royalties for master recordings or publishing.â
Through AdRev, MediaMuv collected royalties that belonged to other rights holders, who starting in 2017, began contacting MediaMuv and AdRev over MediaMuvâ(TM)s fake copyright claims that some believed were genuinely made in error."
https://arstechnica.com/tech-p...
Whenever a faceless entity controls the collection and disbursement of money, that pile of money is vulnerable to fraud.