Where to get simple 3D shapes (box, cylinder, sphere…) URDF models for robot simulation?

I am working on a robot with a simulator. I need very simple plain 3D shapes, for example a 3D plane, rectangular box like a beam, some cylinders, etc. Anyone know where I can find these or if I could make a URDF of my own in a an hour or so? Unfornately I could only find a random shape files for URDFs.

submitted by /u/AwkwardRound
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