Customizable Ear Plug with currently 6 design: Solid, Hollowed, Star, Heart, Positive & Negative Sign. [UPDATE] 2013 / 04 / 12 !For dual-extruder: remeber to set "margin" parameter to zero.Hello :) All design has been tested with a diameter of 20mm and they work well. Smaller is possible but I think under 10mm for hollowed models and 4mm for solid model it is difficult... !For dual-extruder: remeber to set "margin" parameter to zero. Let me know if you have any problem, I will do my best to correct them, do not hesitate to propose new or improved design (* or English correction), this is a work in progress, new shape will come soon.