2x2x2 Slim Hendecagonal (Undecagonal) Prism

This is a set of eight extensions to be glued to a 24mm 2x2x2 to make a slim 2x2x2. However, the slim 2x2x2 is then modded into a hendecagonal. I have a whole series of different shapes of slim 2x2x2s on this account. For a 24mm 2x2x2, I recommend the 'Mini Eastsheen', although the one for sale at the Cubicle is fine as well. I have not made one of these yet, no-one has in fact (at least with my design)! It however is exactly the right size in CAD software. I guess some cleanup work may be neede