A small R/C speedboat that uses the circuit board and battery box from the Smartibot kit along with a cheap toy outboard motor and micro servo.

You can get your Smartobot kit here:
https://www.kickstarter.com/projects/460355237/smartibot-the-worlds-first-ai-enabled-cardboard-ro/faqs

I got the outboard motor here:
https://www.alwayshobbies.com/model-boats/running-gear/hobbies-hi$9speed-outboard-motor-for-model-boat-or-dinghy

Ultimaker

Ultimaker 2

No

No

1mm nozzle, 0.4mm layer height

100%

To attach the outboard motor to the circuit board I drilled a hole in the front, passed two wires through and soldered them to the positive and negative contacts in the battery box. I screwed the other end of the wires into the screw terminals on one of the DC motor connections on the circuit board. I glued part of a servo horn onto the front of the outboard motor and connected it to the horn on the servo with a piece of stiff wire.