Somewhere to put all your awesome ring gauges (from https://www.printables.com/model/1470066-ring-tolerance-gauge-15mm-40mm-in-01mm-increments)

Available in two sizes

Printing

• PLA/PETG
• .20mm 
• ≥5% infill
• no supports or brim

Other

As always, let me know if you want other sizes, or have ideas about how to improve!