Mini Airboat
The build process for this is on YouTube at the following link:
This project is a small 3D printed airboat that uses an 8520 Electric Motor and 55mm Propellers, AAA battery Pack with on/off switch and Solder Sleeves. The parts can be found on amazon at the following links:
Motors/Props:
https://www.amazon.com/gp/product/B078NL9KQQ/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
Battery Packs:
Solder Sleeves:
Some of these parts are interference or close fit, so you will want to do this on a well calibrated printer.
As always, be safe and adhere to best practices when handling the motors and such. The prop cover helps but tiny fingers could still find their ways into the propeller if they tried.