Cylinder and cube calibration object

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I needed an object to check to make sure everything was still calibrated and test circles as I've been printing ovals. So, I created this. It is a 20mm cube with a 20mm cylinder on top. Created in Tinkercad.

I am using an Anet A8, and at the time of publishing this, I am still printing ovals. I have done the follwing:

Printed and installed:
Top frame braces
filament guide at extruder
drag chains
bed spri