Randco Master Blaster 3000 PPD Emergency Air Horn
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The MB3k is a perfect device for warding off varmints or unsavory people, hailing boats or for ordering another beer.
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Model information
- Source
- Printables
- Category
- Audio
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
I had compressed air horns, but the canisters are expensive and wasteful. I need something that will make a lot of noise when I'm on the sailboat, riding a recumbent trike or when charged by aggressive dogs.
This air horn is extremely loud, so don't point at people at close range. I take no responsibility for injury caused by irritated onlookers or loss of hearing.
** Updated: I added an upgraded version with retainers that allow you to add a camera shoulder strap for EDC. Also, I had to replace the left strap retainer .3mf as there was an error with it.
Parts
- Fabin 12v air horn (you can use either high or low tone, I used low)
- Momentary switch
- DeWalt 12v battery adapter
- 3mm and 4mm Voron inserts
- 4 x 3mm pan head screws and 2 x 4mm pan head screws
Printing
- I chose to print the right side enclosure with text up, using supports, to get a smooth exterior finish
- I printed with an OPXL5H, .4 nozzles, input shaper, .20 structural layers, Polymaker Polylite PETG, 10% gyroid infill
Assembly
- Very straightforward
- Heat 3mm Voron inserts for the shell retainer screws and 4mm inserts into the bottom of the shell for the battery holder
- Screw the battery holder to the bottom of the right side enclosure
- Solder the red wire from the switch to the red wire from the battery holder
- Solder the black wire from the switch to one of the horn spades
- Solder the black wire from the battery holder to the remaining air horn spade