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If combining existing designs and custom designs, merging bodies will be your friend. Often, designs you find online will be .stl or .step files, which are covered in triangular surfaces (i.e., you don’t have a large flat surface on which to cut and extrude), so they are difficult to edit. For exampleInstead, to make the Hello Kitty cupcake for Ride the Cyclone (Summer '25), a Hello Kitty head was found online, a cupcake base was custom-designed, and the two bodies were overlapped and mergeda new body, move it to overlap with the .stl body, and combine.
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Hello Kitty Cupcake (Ride the Cyclone, Summer 2025)
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(2)
(3)
(1) Two separate .stl files were downloaded online (a hello Kitty head and a cupcake base). The two bodies were overlapped and combined into one in Fusion360.
(2) The piece was printed in black (yikes) so a first layer of white paint was applied after sanding.
(3) Final product