Recently, I've written a new open-source software named PixelModelMaker.
PixelModelMaker allows you to use simple forms to draw on a 2d canvas. You can then raise each pixel's depth and see the outcome in 3d. One can export the image and 3d model to continue using other software such as Blender.
The idea came from KenShape software which is also available at https://tools.kenney.nl/kenshape.
How to make a 3d cassette tape using Pixel Model Maker:
Source code is available on Github. Mac & Windows downloads are on the Github release page as well.