If I could give them zero stars I would. They don't even deserve one star.
I ordered two disappearing mugs from them and I received one of them broken and both do not seem to work.
I contacted printerpex multiple times through email and their website and I have not received a response (it's been over two weeks of me emailing them with no response).
I would actually recommend everyone to NOT buy anything from printerpex! Nothing at all! Unless you're fine with no communication, rudeness and straight up disregard for any customers.