Since I am currently working on upgrading the macros and calibrating the CR-30 printer, I created a few small boolean test blocks. If the printer is calibrated correctly, the blocks should fit together smoothly, and their measurements should match those of the original STL file.

The block is small, measuring 6.5 mm, but you can scale it to your preference (for example, scaling to 200% would make it 13.0 mm).