Randco Master Blaster 2000 Train Air Horn

I completely redesigned the Master Blaster air horn to support a simpler design consisting of 2 hollow shells that house most of the components. This air horn is seriously loud, and caution is urged. This particular air horn has a definite ‘train-like’ sound, as opposed to other types of horns. I designed the new and improved MB2k to use simpler switches and remote controls. The MB2k is designed to accept standard 20v DeWalt rechargeable batteries. The handle is contoured to better fit a hand and the 2 shells fully enclose all wiring and electrical components. The OEM terminal block ensures a reliable and direct electrical connection to the battery.

I included an image showing parts layout inside the left shell.

Parts requirements

1. Air horn
2. Trigger switch
3. Remote control
4. DeWalt OEM battery terminal block
5. Voron inserts, 3mm
6. 2x 6mm x 25mm pan head fine screws
7. 1x 3mm x 40mm pan head screw
8. 2x 3mm x 18mm pan head screw
9. 2x 3mm x 16mm pan head screw
10. 1x 3mm x 12mm pan head screw
11. Miscellaneous electrical wire
12. Quick disconnect connectors (if desired)

Print notes

1. I printed the 2 shells on an OPXL5H
2. Polymaker polylite yellow and black PETG
3. Input shaper, .4 nozzles, .20 layer height, 20% gyroid infill, 3 perimeters, organic supports (enforcer)
4. I tried using PLA for supports, but the Polymaker yellow filament was cranky, so I used PETG for supports. ymmv

Assembly notes

1. Important! Be sure to tack glue 2x 6mm nuts into the horn retainer posts before assembly
2. Important! Be sure to insert the compressor retaining bolt into the compressor slot before assembly
3. 3mm Voron inserts were used in the left half shell
4. The remote control receiver is screwed down with a 3mm x 6mm pan head screw
5. I used quick disconnects for wiring because I'm shaky, ymmv
6. I tinned the trigger switch wires before screwing in place to make a more tidy bend around the screws
7. I soldered wires to the OEM terminal block for safety
8. I replaced the included 6mm horn retainer screws with 6mm x 25mm pan head screws because I like the look better
9. When attaching the 2 halves together, pay attention to sneaky wiring that might get pinched
10. A circuit diagram is attached, as is a wiring routing image
11. There should be plenty of room to run wiring internally
12. I put a tiny smear of silicone lube in the air hose to simplify connection

Usage notes

1. This puppy is extremely loud and will cause hearing damage if mis-used. You are fore-warned and I do not accept responsibility for mechanical or hearing damage or assaults from angry bystanders.
2. The advert says these are 150db. Given the random zombies I saw staggering around I do believe the MB2k will wake the dead.
3. I use various sizes of 20v batteries.
4. My main use for this is to scare away deer that are forever destroying shrubbery. Many folks use these for sporting events, car races or weddings if you want to be 'that uncle'.