2CO

The object of 2CO is to make a burr knot with three pieces which are two C's and one O. However the whole should be assembled inside an enclosure with edges on top. And if this isn't burdensome enough, the requirement is that the O piece is must be mounted horizontally ie. coplanar with the bottom.
In difficulty, we give 2CO three stars.

Get 2CO here: Order your customized puzzle locally printed via the Treatstock hub.

Get the STL's here: Order the STL's for DIY 3D print via Paypal and receive the files by email.

price/$10.13