I designed the 3D printed parts in a way so that you can wind the dipole Wires and the Coax Wire on the middle Piece.

http://www.thingiverse.com/thing:2257598

You also will need 8 Isolators.

http://www.thingiverse.com/thing:2256546

 

 

The Settings of the 3D Prints are not that important.

I have printed my Parts with 20% Infill and it worked fine.

 

Best Wishes

Hoonse