The market is niche but not necessarily the profit pool. Dell buys PCBs from Foxconn who buys the components in large bidding processes from commodity vendors who probably are eking out basis points of profit. Whereas if someone’s making this for a hobby project or a piece of home decor they might be willing to pay $20 for the printing. Could be a very nice profit stream.
Second, I hadn't heard of the CC public patent license before, but it seems like a good way to go to keep an idea "free", rather than not pursue a patent.