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I haven't got one. I'm unlikely to buy one for myself. (My son is 2 and a bit. I may buy one for him when he's old enough to make use of it.)

I am interested in them and I love reading about stuff people are doing with them and I see that they're an important innovation. But I'm happy for other people to be doing that stuff.

I have seen some 3d printed stuff that I wanted to buy. Someone made some ceramic mugs, and the first iteration was cool and clunky and not neat shaped. There are some cool puzzles and math toys too.

I'm in the same position. I like them intellectually, but so far I am >95% sure that if I bought one it would be used about as much as my inkjet printer is currently used. Part of it is that most of what I would personally want to build out of plastic is fairly macro-scale, and approximated surprisingly well by Legos.

Same here. Specifically, I'm not buying one until I can print circuit boards.