Quick 8MM Calibration for X Y Z

This part I designed helped me calibrate my cheap printer. Slots and holes are meant for 8mm sized linear rods to fit. Although, use the entire X/Y measurement (30mm * 30mm) to set steps, then rod should fit (very) snug into hole, and rods should slide in and out of slots with minimal resistance. This part utilizes a concept of setting steps to exterior specs to get correctly rationed interior specs.

If needed this part could be flipped to sit on vertical axis to set very accurate Z steps, bu