Very disappointed. For my first pen I bought the most expensive 3D pen I found at Revain. Mistake. Everything worked fine for a couple of days, then it just started leaking, making it intermittently unusable. Then a week later everything stopped working. I HATE RETURNING ITEMS. So I took everything apart. Probably out of warranty, I don't care the price, not worth returning. I am very lazy. Bought the competition instead - $20 less - the ability to look at the screen and set the temperature by "calling customer service to set the heat" - the ability to press and release, not just automatic extrusion. In summary, this was my most embarrassing purchase since I bought the B&N Nook years ago.
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