It's two linked together to save on the printing costs. It's still a little rough. The underside is pretty devoid of detail. I don't want to add to much more because it will up the volume and the price. Right now these two together will cost roughly $7.50 to print. Throwing in a box of guardians to make the riders, a squad of 6 would cost about $60. Still a bit more than I'd like, but it does save $20 bucks off of buying 6 Jet bikes directly from GW.
It may be cheaper to print off a single set, and then cast more with a basic resin casting kit from the hobby store. The lack of underside detail may be beneficial in that case since I could get away with using a one sided mold.
Though getting the Guardians to make the riders are still the bulk of the cost.