July 25, 2022
Description
Summer season started here in germany.
It's hot and and I wanted to cool down.
Using water.
My cheap watergun broke and I wanted to build my own.
An electric one with a big tank, a good range and cheap parts.
This is the result.
It has a 1,2 L water tank and a range around 8 meters, depending on the nozzle and battery level.
It is also possible to "quick charge" the water tank, by pressing the tank under water.
For this feature the pump should be sealed with enough silicone :)
You will need:
Solder the Li-ion in series and connect the BMS according to its schematic, connect the output of the boost converter to the BMS and connect the VCC and GND pins from the USB C breakout to the boost converters input.
Connect the output from the BMS with the water pump and connect the button in series between the pump and the BMS.
I covered all the electronics with clear varnish and a second coating with silicone.
I screwed the nozzle adapter directly into the tank.
The lid is a bit loose, so I glued it permanently on the handle with superglue.
I also mounted the PCBs with superglue.
The cables and the hose is mounted with zip ties.
I included the STEP file, if you need to change something.
I printed all the parts with PETG except the nozzle adapter, min. 3 walls and 75 % infill. The nozzle adapter is printed in nylon, but you can also print all the parts in PLA or ABS or whatever .The tank adapter may be too unstable if you print it in PLA. It may then need to be reworked. But it is srong enough, printed in PETG, to hold a full tank while running in a water fight.
The handle should be printed with the chamber for the button facing the print bed, so you need less support.
The handle should be printed with the long, flat part facing down.
The other parts do not need support.
License:
Creative Commons — Public Domain
JannisJFry
