A variation of the GrabToy++ : Mad Cobra with double the frames so that it closes into a circle when extended.
Make sure you select the proper slack according to your printer capabilities. There are two versions of the Cybalobsta: one with 0.5mm slack and another one with 0.25mm slack. Use the 0.25mm version if you have a high-end printer.
If you are in doubt of which version to choose, print the HingeSlackTest model first. If the .25 hinge works you can go for the 0.25mm slack version, otherwise print the 0.5mm one.
You can of course edit the scad file and set the slack parameter to any value you want, then render the model to an STL file and print that one.
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