Minnesota Loud Dual-tone Flat Whistle (Optimized)

An efficient Minnesota Flag remix of the 4mm "beta" loud flat dual-tone whistle by Jonas Daehnert. Only 12 color swaps for a double-sided flag. Jonas' 4mm beta whistle is hands-down the best resistance whistle we've tested so far, and had the most positive feedback. This remix customizes it for mass production of the double-sided MN flag—59 fit on a P1S build plate, 3g per whistle, 94% efficiency with prime tower and purge.

Tips for success.

Bambu machines: All profiles are set up just right. You just match the filament in the AMS and go.

Non-Bambu machines: If you are going to mass produce, it's worth following this guide to get setup once. Start by bringing a single whistle in. You'll do all color customizations on one whistle before cloning it out. You can disassemble to select colors, and then bind a colored whistle back into an assembly. This you can clone and layout on the plate. I use side plates to make smaller logical groupings such as rows, columns, or quads, and assemble those for cloning on the main plate. 0.4mm spacing is optimal and placing the purge tower over the purge line is not only acceptable but recommended. 

For any mass production, if you are using one of the machines that has the blocked out corner in the bottom-left for the filament cutter (X1, P1), the slicer may detect travel moves that cross it as out-of-bounds (a bug). So if you get weird out-of-bounds errors, move the parts further away from it. This is worked-around in the provided profiles, but similar issues may occur on non-Bambu printers with out-of-bounds regions.
 

Highly recommend these settings. These whistles will lose their "dual-tone" sound when not printed correctly.

0% infill
0.3mm first layer height
0.2mm layer height
0.63mm inner walls
0.63mm solid infill
0.42mm outer walls
2 walls
No supports, brims, rafts
Purge tower enabled
I like 1.4x flush multiplier for the filaments I'm using and recommend below.

Important:
External bridge infill direction for normal vertically oriented whistles of 90 degrees. Any whistles that you rotate horizontally to fit do an override on them for 180. As directed by the original author this makes the bridges go long-ways across the whistle and helps maintain the right airflow for the dual-tone.

Dark Blue Filament (Body): #002D5D
Polymaker Panchroma Matte Army Blue (best)
Elegoo Matte Navy Blue (best)
Polymaker Polylite Blue (a little too blue, but acceptable)

Light Blue Filament (Pentagon): #52C9E8
Bambu Matte Ice Blue (best)

Elegoo Matte Ice Blue (best)


White Filament (Star): #FFFFFF
Polymaker Polylite White (best)
Any other white filament