A small adaptor for Dr. Perl junior active cole filters. The adaptor pieces are designed with openscad and are fully parametric. If you find the filters available in your place to have a different diameter simply install openscad (or do it anyway ist awesome) and tweak the diameter variables.An active cole filter [0] adaptor. I print them with 0.15 layerheight from PLA because i like that smooth surface. Let me quote the header from the openscad file here: "Better fuck stoned than drive drunk." -Socialist youth austria [1] This is a small adaptor piece that you can plug in an active cole filter on one end and the cigarette on the other end. These filters are really good, but if you roll cigarettes with them, they become much bigger that what you would normally roll. Also the filters are reuseable up to 4 times. Better for the environment, better for you. AAAAAAND: No. I do not promote smoking at all. Whatever it is you intend to smoke .. if you haven't started yet, don't get started. Nicotine is a super addictive poison. [0] http://www.vauen.de/de/filterinformation/dr--perl-junior-systemfilter-plus.aspx [1] http://www.sjoe.at/content/oest/themen/drogen/article/276.html