My pen decided that its time to run noisy without a cartridge.... Runs as its supposed to and its pretty silent with the cartridge in it tho !!
I feel like it vibrates more too without the cartridge too !!

Im really tempted to try and open it up to clean it out... maybe its just dust or something in there... Did anyone managed to open one to its guts ? Is it hard to do so...? I know i opened some Thunders, and that was a pain in the ass and scratched the front plate ...