Super fast flute (cover open end with finger for sound)
thingiverse
This easy-to-print flute produces loud sounds when you cover its open end while blowing into it. Additionally, it serves as an excellent tool for tuning your printer's minimum time per layer under Slic3r's Cooling tab (default is 15 seconds). I printed mine using a fan and 4-second layers, which turned out great in just 15 minutes. No support is needed, and you should scale the gcode output to avoid infill on round sections - two perimeters are sufficient with my 0.35 nozzle at 90% scaling. Contrary to the picture, a brim isn't necessary for printing this flute.
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