Modified Whistle

thingiverse

The Steam Train Whistle has a much stronger sound, requiring less air - when I compared the design differences, this whistle features significantly larger windways, so I transformed the rectangular windways into tapered sections that gradually narrow toward the chamber. The result is a much clearer sound for much less blowing now. I also added an option for finger-holes and a rope-ring on the second pipe, which I assume will be shorter than the first. Finger holes are simply a poor idea in an instrument this small, any air leakage from the chamber results in no resonance. This design has actual playable holes, is reasonably in tune, and seems to print fairly easily. Print Settings Printer: Flashforge Dreamer Rafts: No Supports: No Resolution: 0.14mm Infill: N/A Notes: I get the best prints with the "long side down" so the splitters are vertical, if they're horizontal I get some stringing there which interferes with the sound. These take right around 3 hours and 6 meters of material to print on "High Quality" settings in ABS. Post-Printing ABS Polishing: If you print in ABS, acetone vapor polish makes the part nice and shiny (and a little smelly for a few days), the rope ring is quite helpful to hold the part up when in the vapor bath. How I Designed This: SCAD online help: I am completely new to SCAD, so I took a look at some of their included examples and some online wiki pages that made it possible to make the modifications. At first, I was exporting the whistle in .stl from SCAD and then adding the ring in Blender, but it's not really that hard to add a torus in SCAD, if you take the time to learn about it.