Gridfinity holder for a set of radius gauges, specifically:

• 1 to 7 mm
• 7.5 to 15 mm
• 15.5 to 25 mm
• 25 to 50 mm
• 52 to 100 mm

I got mine from AliExpress but they seem fairly common. I've uploaded two sizes:

• Shallow - Minimum height, to save on filament and print time. This is the one I printed for myself and is shown in the pictures.
• Full - Standard 42mm height for a gridfinity bin, for those who prefer a consistent level across bins.