If you haven't already, using .svg files in slicers works great and can be an awesome way to start designing without using Cad. Free vectorizing software is out there and I'm sure someone can recommend in the comments, but it will get you started. I pay $10/m for Vector Magic because I use it daily and it allows me some editing options free versions do not. Import your files like any other object in Prusa/Bambu/Orca and the slicer will give the svg a body that you can resize and print. Sometimes you get a surface glitch where 2 surfaces are intersecting, split your body to objects, change the color of each body, then assemble. This also skips paint which can take a lot of time to get right.