It stands 180 millimetres.
20 printed parts and one silicone cord. No battery, no motor, nothing to charge. Keep scrolling to wind it up.
Two turns. Twelve centimetres.
A 180 millimetre robot duck that runs on one silicone cord. Wind the knob on its hip 2 turns, set it down and let go. It rolls 12.6 centimetres, coasts to a stop, and waits to be wound again.
how far it goes: 126 mm, drawn to scale beside a 180 mm duck
One eye, one bill.
A purple ring around a dark lens, a small sensor beside it, and a wide yellow bill under a near-black rim. Five of the 20 parts are just the head.
Wind the hip.
The knob is one end of a hollow axle running right through the duck. 2 turns is its whole budget — the cord inside will not take more.
One cord, threaded through.
A silicone cord runs down the middle of that axle, tied to a fixed anchor at one end and to the axle's own crossbar at the other. Twist the axle and you twist the cord. That is the motor.
Let go.
The cord unwinds, the axle turns, and the 20 mm drive wheel pushes off the floor. The two 12 mm rollers at the back just trail along on their pins.
12.6 centimetres.
One knob turn is one wheel turn is 63 mm of floor. 2 turns, 126 mm, then it stops — small enough to run across a desk and not off the far side.
Thirteen parts make a duck. Seven make it go.
The build splits its own files into two groups, and the split turns out to be the product: the half you look at, and the half you wind.
On the floor.
It is a floor toy first and a desk toy second: 87 × 38 × 180 mm, 94.0 grams, and a turning circle of exactly nothing — it only goes straight.
20 parts, eight hours, one cord.
20printed parts
94.0 gof PETG
8.0 hon the printer
- Overall
- 87 × 38 × 180 mm
- Standing height
- 180 mm
- Material
- PETG, four colours
- Drive wheel
- 20 mm, one, at the front
- Rear rollers
- 12 mm, two, free running
- Wind
- 2 turns of the hip knob
- Travel
- 126 mm, then it stops
- Not printed
- one silicone cord
The cord is the wear part and it is meant to be replaced. Winding is a job for adult hands: hold the knob until the duck is on the floor, then let go.