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For a University course I would like to print a modified version of a so-called Fin Ray gripper. The effect I want to obtain can clearly be seen around 1:45 in the first video on this page: http://www.festo.com/cms/en_corp/13706.htm

What material is flexible enough to handle these deflections?

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Hi there !

I think, that “Semiflex” by FennerDrives would be appropriate for this purpose, however the original “Ninjaflex” material has more friction, which might be better.

Ninjaflex will have the right amount of grip, but is too flexible. It seems like the “ribs” in the gripper are stiffer, then the outer part.

I would recommend, to print the ribs in 2-4mm thick ABS and the outer part out of Semiflex, upon demand you could weld on a Ninjaflex cover over the Semiflex part to give even more grip.

I have Ninjaflex and ABS in stock and also offer Semiflex (due to the low demand I buy it on demand and have only a little bit in stock).

Please start an enquiry on my hub, if you want to team up with me, to realise thie project.

The link to my hub: www.3dhubs.com/siegen/hubs/marius

I can print in multiple materials at the same time, which would allow for a hybrid print out of Semiflex and ABS.

Additionally I do offer acetone smoothing, to strengthen the ABS part.

If you don’t have the 3d model, this is no problem, as I work with professional CAD software and can design the part for you. To give the gripper different properties I could alternate the placement and amount of spikes, thickness of the outer part and much more.

Kind regards,

Marius Breuer

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Hello Marius, thanks for your quick reply. A combination of Semiflex and ABS seems perfect to me! Ninjaflex would probably be a little bit too flexible.

I would need the part in Enschede the 20th (21th latest). Is that a possibility if we team up?

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This should be possible, please start an enquiry to discuss the details.