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I usually post them in facebook marvel legends groups because there are thousands of people who collect action figures who may want one. Kind of a niche hobby lol. I may eventually set up a site or something.

That is way cool! I've watched several videos in past months of guys that get the large, yet plain action figures that look meh and then make them look real.
Does that type of stuff really sell?

Yeah. Customs sell well. Also what Ive bern doing has been selling well. Ive made probably 700ish by 3d printing accessories for action figures, super niche market