This is a calibration device for accelerometers, gyroscopes and magnetometers capable of doing 20 unique attitudes with 45 degrees (skewed) or 90 degrees (straight) of separation resulting in 320 potential poses for a mounted device.
8 yaw poses x 8 pitch poses x 4 straight roll poses +
8 yaw poses x 2 horizontal pitch poses x 4 skewed roll poses
For a complete calibration device you will need to print:
The purpose of A-parts is to show the gravitational vector for alignment of the calibration device. I suggest about 30% infill for all parts except A-3. For reasonable application A-3 should be printed with at least 50% infill in order to increase mass.
B-1 & B-2, B-3 & B-4, A-2 & A-3 & A-4, 2x C-2 & B-1 and 4x C-2 & C-3 are supposed to be glued together.