Just made this to pinpoint any issue with my Prusa Mendel. It should work to test out any machine (in theory of course).
I created a 140mm one (since my calipers only go to 150mm) to check my Prusa Mendel, but I made one at 90mm too for the MakeBots out there.
The circle (which is half the size: 140mm object = 70mm circle) should be pretty hi-res so you can check if your belts are loose and stuff.
This also helps check the level of your build platform.
I used this object to really fine tuning my printer and seems to get things more accurate when measuring a printed object than just the carriage movements.
Print it out and measure.
--- X & Y should measure to either 140mm or 90mm
--- Z should be 30mm (the tower in the middle)
--- The circle (outer diameter) should measure half the total size of the object you chose (70mm or 45mm)
--- Measure the consistency & thickness of the outer edge to find any issues with your build platform.
- Adjust printer X, Y, Z values if needed
- Repeat step 1 & 2 until perfection is reached.