For those interested, my shapeways order just arrived.
Ordered a bunch of them during the week with free shipping.
I got
the wing things/gun for CW Hod rod and Runabout
5mm peg pistol X4
the cannon for TR Megatron
4mm peg (with 5 mm on the top) pistol for classic Hot rod
Cannon for the old legend Brown Megatron
Cannon clip and G1 helmet for TR galvatron
They all turn out pretty well aside from some white spots where you have to cut the parts from each
other.It appears colors in 3d printing are coated later after the item is built.
The only one that gave me some issue is the TR Galvatron cannon clip. The peg is a bit too big for the hole on the arm, and forcing it well stress the plastic. The hole for the cannon is too tight, it wrapped cannon's peg at the top a bit.
I ended up shaven them all down and use nail polish to thicken some over shaven parts.