Miniature Robotic Hand for NinjaFlex by Open Bionics

by openbionics, published

Miniature Robotic Hand for NinjaFlex by Open Bionics by openbionics Mar 25, 2015
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This is a miniature robotic hand made by Open Bionics while exploring the idea of making fully functional items in a single print.

You push the base of the hand to make it open and when you release it springs shut. It makes a fantastic business card holder and is also great at grabbing onto things and picking things up.


It prints in a single piece out of NinjaFlex (knuckles down).

At Open Bionics we're working hard on making affordable robotic hands.

Follow us at @openbionics for more cool stuff.

Check out our website www.openbionics.com to see more of our work.


We print using Lulzbot 3D printers (a TAZ 2, a TAZ 4 and an A0-101). The Cura profile we use is included in the source files. These need to be printed really slowly as they have very tall islands with small printbed contact area.

From our experience you need to keep the travel slow - around 60mm/s and the print speed around 10mm/s to get these little guys to print! Layer height seems to work best at 0.2mm.

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lo imprimi 2 veces y cuando intento usarlo no me funciona, sale distinto la mano que en la foto aparece en rojo

does semi flex work?

I have to say - amazing job designing this! I checked layer by layer and you clearly thought this through...very clever. I'll give it a print on my Form 2 and see how it goes!

Has anyone tried making a bigger scale of this print? Would it work?

We did, on the Massportal and it works, with primalloy from Verbatim perfect.

awww so cute and very good nice job keep up the good work

What was the we weight in grams

Printed this out on a standard Makerbot Repli 2X - no modifications to the extruder head. Worked through 4 models before finally managed to get very good printing quality. Using standard FennerDrive NinjaFlex with the following settings: Extruder temp: 245C, Cool Bed (room temp), 0.6mm Retraction distance, 150mm Travel Speed, 60% Infill. The key to good results, we found, was increasing Travel Speed and increasing Retraction distance. We're going for 1 more model with the Retraction distance set to 1.5mm! End results are very fine hair-like starands which break-off almost as soon as you use the mechanism (sheer brilliance, by the way). Easy to clean-up too.

...and what printer did you use to print this? That hand looks pretty good!

50% Infill on a LulzBot A0-101

Your print looks much better than mine. Can you post or send me your slicer settings? Also , what hot end did you use?

Hi, what % infill did you use?

Could it be easily modified to function in reverse? As in pulling to close the hand and pushing to open?

it is possible to print with abs? or i need a flexy ? thank you

Hi Ambrosie,

You need flexible filament, we used NinjaFlex > http://www.ninjaflex3d.com/

Very cool! Now I need to get some flexible filament!

FYI - I think that this would be a perfect entry for the Flexible filament contest that MyMiniFactory is having right now.

We saw that! Would we need to print in a specific flexible filament to enter?

As I understand it, they print all of the entries for voting. After seeing that Gyrobot got good results from another flexible filament, I expect that your design should work in the Verbatim filament that they will likely use for printing it.

Cool design!
It´s only one piece?

Thank you! Yes, it prints in one piece.

Great design, thanks for posting

No problem! Enjoy making!