Hmm it vapes very well with the 3mm coil but I think the amount of coil and cotton in here is reducing the chamber too much and caused this thing of bubbling up into the chimney that is hated with the hastur mini. No liquid coming out the top at least, but I really dislike the sensation. 2mm for me, it seems (I’ve misplaced my 2.5mm drill bit!). Hopefully I’ll have 10 minutes to do it later.