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I received a request from a TFW2005 forum member to design Powerglide-style wing-mounted booster-guns that would be compatible with Combiner Wars aircraft, Air Raid in particular. Some people have been modding Air Raid figures to look like Powerglide, but with the ability to become a deluxe combiner limb.
The booster-guns come in pairs and are compatible with 5 mm ports where clearance issues with the rest of the item do not exist. These even work on Alpha Bravo and look especially nice in his helicopter mode, so maybe he can keep up with his fellow Aerialbots for once! I tried to make the item so that they can be hand-held like pistols, too.
I have tested this model first with Shapeways' white and flexible material, but then with my very own, new-to-me Monoprice Select Mini V2 printer in white PLA. The item shown was printed with my personal printer. If my ~$200 printer can print this thing fine, so can Shapeways' multi-thousand-dollar printers!
In the unlikely event that there are any issues with the booster-guns fitting loosely, I recommend trying a coating of your favorite floor or nail polish to tune the fit.