It's been a long time since I made a custom figure with a full Jazwares figure (the commissioner went through the trouble to find one) and by his request I only used hand sculpting techniques to customize her, no 3D printed parts at all. Her echidna dreads and tail are made with apoxie, her legs are swapped out with Knuckles' and a Boom Sonic's feet, and she has a skirt made from a little piece of T-shirt fabric.