Wing Tube/Spar Clamp

I have had a couple requests for CF wing-tube spar clamps like the ones used in the X-UAV and Zeta foam planes. Some time ago I had a "rough" landing with one of my older FX-61 wings so I took the spar clamp out and made a few prototypes. Mine are a little different because I wanted them to be easily printable and durable in just about any print filament. The pieces shown on this page are done in PLA and appear they will work very well but I would recommend ABS or POLYMAX for the toughness and U