The printer cost me about $1700 CAD, there is probably less than $0.20 CAD in plastic per piece, at med resolution it takes about 40 minutes to print.  The black and white ones on that rig are 3/4" and made from ABS. I also made a handful of ~1/2" ones for 1/2" aluminium square tube as well.  Structurally I am pretty sure 1/2" would do a 3 or 4 card rig but I happened to have some 3/4 kickin around so I used it instead of buying new 1/2.  I did blue PLA, white and black ABS if I have time I'll post a few pics of the pieces by themselves without the aluminium.