Summary This is a super loud dual tube whistle perfect for outdoor hiking and all around security. Using 0.2 resolution and 50mm/s the whistle can be printed in about 35 minutes. *** UPDATED -- 5/30/2016 -- updated for better performance. Print Settings Printer: Maker Select Rafts: No Supports: No Resolution: 0.2 Infill: 30% Notes: Printed with 30% infill and 1.2mm walls. This can be printed with more infill without much more time or filament.