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Works for most people. You have to print at a slow speed and take several minutes lightly prying the two halves to get it to pop open. I've printed 3 of them that all worked. I don't use their cheap settings though. I do 100% fill and .1 layer height. Yest it takes twelve hours to print on my MP Select. I brought it into Cura, doubled it in size and printed one more that opened quite easily. (It took 32 hours to print.) The whole purpose is to waste your time having fun watching it make the internal parts. Showing off the bigger one to friends blows their mind when they find out it printed as one part. You do have to work at it carefully for a while to get them to open right but they usually will. Just don't print at 15% like the description says unless you are using better filaments.