Made two runs of this one...it is so cute! My grands are going to love this!!! 1st run, was done on an Ender3 V3 KE, using Sparkle Green Rainbow PLA. (The blemish on the top of the shell was my goof...I accidentally kinked the filament at the last few layers.) The default size was enough to show some of the color shift...gradually getting darker towards the top. 2nd run, done on an Ender3 V3+, I started with Sun Yellow PLA, then swapped back to the Forest Rainbow, at the end of layer 51. On my setup, layer 51 is the very last layer that touches the flippers...double check your own setup before attempting a filament change, as actual layer numbers may differ. The head for both is Grass Green PLA. Both were printed with .4 nozzle, 300mm/sec speed (30mm/sec start layer), retraction enabled, no ironing. Not sure of the time on the KE; the print time for the V3+ was around 1h 20m, at the default size.