Calibration Cube XYZ with bridging and thread test

Yet another calibration cube! Calibration cubes are a good way of giving you information of your printer's strengths and weaknesses. In addition 3D printed threads are becoming much more reliable and have been a feature I have been implementing more in my designs. This cube's separate insertable Z-screw will show you if your printer needs a little more tuning in it's overhangs. When printed correctly, the screw should be very smooth to insert. For more info on calibrating your p