Flexible holding hose

Update: ok at least in PLA i think they're not good enough to hold some angle as they are. Maybe in ABS/other materials you tighter versions have more grip. The idea is probably workable at least as attachment strategy in PLA too.

Update: [see my deriv](http://www.thingiverse.com/thing:98953), for it aimed more at attachment strategy.

They’re basically two hollow spheres, except with one has slots in the side so it can flex to shrink, this makes them easier to fit together with larger a