1:1 scale Federal Model A siren (revamp!)

here's a revamp of my previous 1:1 model A that was made in tinkercad. this one is very accurate as well as proportional! made in OnShape. Huge thanks to Marryfluffy2020 for help in testing parts!

self to note: don't expect the parts to work on a real model A siren. some parts were made for functioning rather than accuracy.

hardware:

15 M3 by 5 screws

2 M8 by 30 screws (make sure to use a nut! this will tension what position the horn faces)

1/2 " clamp for junction box

and a 775 12V DC motor.

put 2 M3 screws on the shaft of the rotor! this will secure it at best from torque.

plastic weld the 4ths horn sections if your printer is not big enough for a full size horn.

PRINT INFO:

rotor - 100% infill, turn the walls up to 1000 in slicer. or use supports.

stator: 50% infill

motor cover: any infill, this part is optional.

intake: 20% infill

outer horn: 100% infill

motor housing: 50% infill

spacers: 20% infill 

mount: 90% infill for best reliability

i hope you have good experience with this model!! i would like to see your builds if possible, which can be done by posting in “makes and comments” or tag @TheModel2TOfficial on youtube!

demo video: 

https://youtu.be/X0AKSPHp1Ec?si=x_hA9YcP6OD_gy_v

model AV option is here! This is the intake, intake bracket, and motor housing to make my A an AV! https://www.printables.com/model/1489129-model-av-accessories

update 6-20-26 V3 revamp is posted! untested, so print at risk! it should work.