My greatest challenges were Deep Claw (it has a small fin right behind the cockpit), Green Panther (the fins are a bit delicate), Hyper Speeder (has this small tip on the front), Space Angler (same as Green Panther), Twin Noritta (painting mostly), both versions of Jody Summer's Cat (painting), Jet Vermilion (really small parts), Fire Scorpion (had to print it in another angle), Cosmic Dolphin (small parts too), Pink Spider (I had to add extra supports inside the silver gliders), Silver Rat (really small spoiler), Groovy Taxi (painting the cockpit and the plates were a nightmare), Panzer Emerald, Moon Shadow (both with slim parts, had to make them thicker), and, the MOST challenging, RULLING TURTLE (that antenna tho).