Christmas lights Heli

A Christmas lights fire fighting Helicopter.    It features a few prints that are described in detail as per links below.   A simple MDF cutout is spray painted, some LED strips placed around outline.    The various components could be adapted to other stuff.  Hopefully the build is self explanatory from the photos and files.   Attached here are the load bearing holders and gears.  The bearings used are basic skateboard bearings.   You can buy the bearings very cheaply by purchasing a cheap skateboard which provides 8 bearings, washers and bushes.   Other files and description can be found at:-

Main rotor slip ring here https://www.prusaprinters.org/prints/103824-robust-2-pole-slip-ring-horizontal-mount

Tail rotor slip ring here https://www.prusaprinters.org/prints/103779-2-pole-slip-ring-perpendicular-mount-light-duty

Infinitely adjustable/expandable Timer cam switch here https://www.prusaprinters.org/prints/104362-infinitely-adjustable-and-expandable-timer-switch

I used a small geared motor purchased from Jaycar for the tail rotor with 4mm shaft https://www.jaycar.com.au/70rpm-12vdc-reversible-gearhead-motor/p/YG2732

For the main rotor I used a larger geared rotor with 6mm shaft from Jaycar https://www.jaycar.com.au/55rpm-12vdc-reversible-gearhead-motor/p/YG2738

No doubt you can find cheaper equivalents at Aliexpress etc

For the other effects I used a standard store bought waterfall light system and switched the power on/off with the cam timer for the water bomb effect.  The fire,  water pump, rainbow lake and rotor lights by WS2812 LED strips and Arduino's is thanks to "Tweaking for all" https://www.tweaking4all.com/hardware/arduino/adruino-led-strip-effects/

Sharp eyed people will notice the rainbow effect is not changing on the rotor and this is because of too light gauge wire with a long run.  Heavier gauge wire fixes this.

Quick video here