20mm magnet tubes, gridfinity 2x1 base

Extension of the tubes and gridfinity bin from https://makerworld.com/en/models/1183692-magneto-gridfinity-magnet-washer-battery-holders I have magnets larger than the maximum diameter supported by the original design, so using the original blank tube and cap as reference, I created a larger tube that can fit a 20mm diameter magnet. I included tubes labeled for 20x2 and 20x3 magnets. I also included a 2x1 gridfinity storage bin (7 units high) that can fit two of these 26.5mm tubes. The holes in the bin are 27.9mm in diameter, if you want to generate some other type of holder.