Too be honest mate I wouldn't worry. I had to send my fucking mod back. Same day I got it. The battery door wasn't sitting flush like not proper warped but enough for me to be pissed off. The battery sled which hides the chip was rattling around in the mod, I opened it and it was off and the clip at the bottom was broken. I ordered the black 510 connector and it came with stainless. No USB was included. He said to me that the door on 3d printed mods don't sit flush until they break in wh8ch is fair enough but this was more than it just not sitting flush. I went with the send 5 angry emails in a row technique to get a response. The mod it's self though was finished beautifully, flawless in fact. Just that battery door killed it. He's gonna send a new one out and possibly refund the money it cost me to send it back. What a joke.