This is my speedboat III , it is 39cm long (85,09% of full scale) so the hull could be printed in one piece with my cr10. I have sliced it with cura using 2 walls, 0.3 layers, 10% infill, 7 bottom layers and no supports. Inner compartment is sealed with epoxi/alcohol mix and oitside with transparent acrilic spray. I am running a 1806/2300kv , 30A speed, 3S 1300mah batt. The stand is a remix of https://www.thingiverse.com/thing:1933766, and its available at https://www.thingiverse.com/thing:3078363 . I designed it to be printed without supports.