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What did you do to protect the PLA because PLA sucks water. after glueing it all together when i put it in water it becomes 10% heavier after 15 min (in water) ?
The exterior was protected with 5 layers of polurethan varnish. Still it becomes 10% heavier.
The only thing i can do is spray paint on it. But because it is al glued together it is almost impossible to spray paint in the inner parts. For example where you put the lights and left and right motor.

Marnix

PS: The electronics are ready. I'm using a raspberry Pi 3 and a Pixhawk. i also include a leak sensor and a water pressure sensor. The raspberry picam 1080P is mounted also on a tilt gimbal.