Climbing Robot

Climbing Robot

This is a fun little 3D print that might be interesting for newcomers to the 3D printing game. The design is based on the mechanical principle of a traditional wooden toy that lets the robot climb up the string if you pull on it.

You can get “Climbing Robot” Merch here.

Parts List

The STL files are available for download here on github.

Besides the printed parts you will need an elastic band and a string.
I used a elastic band as commonly available for textile work. A normal rubber band might work too but is probably not as long lasting. In any case the band can’t be wider than 5mm (0.19 in) and thicker than 1mm (0.04 in).
Not everything will work for the string as the correct amount of friction in the robots “hand” is crucial for the climbing action to work.
The model is optimised for a ca. 3mm (0.1 in) or a ca. 2mm string. There are two versions of the clamp available for download. From my experience a coreless braided string works best.

Additional materials


The model is optimised for printing with a 0.4mm nozzle. The sloped surfaces look best with a 0.2 layer height but larger layer height wont be a problem. Most of the models parts are optimised for printing without support and all are oriented correctly in the STL files for optimal printing.
The following parts need extended settings.



The video above contains step by step assembly instructions if needed.

If you printer is tuned to produce precise dimensioned part the robot should friction fit together without glue. Otherwise just use glue or tune up the fit with a file or sanding paper if the parts are too large.

Explosion dagram

Tuning the clamping mechanism

In general the clamp should clamp just hard enough to hold up the robots own weight. Use a round file to smooth the bottom of the groove the rope runs through in clamp-p1.stl’ to remove all the printing striations. Apart from that it’s important that the hole through the “shoe” is large and smooth enough to let the rope slide through without friction. A good way to achieve this is to bore out the hole with a fitting drill. I chose a 3.5mm drill for the 3mm rope I used.

You’re done. Have fun

A Flying Jellyfish

This contraption, built by applied mathematicians Leif Ristroph and Stephen Childress of New York University, is not the first small ornithopter — a flying machine capable of hovering by a flapping-wing motion, such as that of dragonflies and hummingbirds. What distinguishes Ristroph and Childress’s craft from other flapping insectoid biomimikry robots is that it can remain stable in flight using the movement of its wings alone, without the need for additional stabilizers or complex feedback control loops to avoid flipping over.