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.
So you have a 3D printer and need to print something ... Blender is a tool for organic and sculptural forms. Want to print out a plastic tree? Blender is a great tool. Want to model some Greek ...