You can make those with Blender easily. Using Blender to design a small object to send to a 3D printer is like using a bulldozer to build a sand castle. You can do it, but it’s overkill.

"[Blender] is daunting at first ... Once you've created a 3D model, it can be sent to 3D printers, computer-controlled routers — commonly called Computer Numerical Controlled (CNC) routers — or even ...

You need a 3D printer, but it doesn’t actually print the paper. Instead, you use the printer to create a mold that can form paper pulp you make out of recycled paper and a blender. [Aidan ...