Calibration Tube and Sphere

I got tired of there being a lack of basic calibration objects out there. These are super simple. Just resize and place anywhere you want to test your printers calibration.

Why such a simple shape for calibration?
Well if your machine has bad belt tensioning or y-axis shift, or even z-banding, it becomes a headache to figure out what exactly is wrong. Even worse you need to do repairs and all you have in your tool box for test prints are super complicated objects that don't address the bar