My ashtray at home got so dirty that I chose to just print a new one rather than clean it. The idea behind the 'earthquake' pattern is that it will look cooler as it gets dirty and fills with ash and tar (lol). There is also a hidden compartment inside the skull. The opening is underneath, seeing as most guests won't turn your ashtray upside down. I'd like to thank 'somesailor' for his great 3d scan "Grim Reaper", which I used in the design. Please leave a comment and/or post your prints! :)I recommend 100% infill, but if you choose to print at lower density you'll at least want to beef up your wall thickness and top layer thickness. Comments/print pics are much appreciated. :)