This stencil lets you determine your personal ring size and test if your 3D printer is calibrated correctly in terms of dimensions (X and Y).

The sizes on the stencil are ISO (8653:2016) sizes and mean the inner circumference of the ring in millimeters. They are common in European countries like Austria, Belgium, Denmark, Finland, France, Germany and Sweden (to mention some).

Table:

48 = 15.3 millimeters (internal diameter)

50 = 15.9 mm

51 = 16.2 mm

52 = 16.5 mm

53 = 16.8 mm

54 = 17.2 mm

55 = 17.5 mm

56 = 17.8 mm

57 = 18.1 mm

58 = 18.4 mm

59 = 18.8 mm

60 = 19.1 mm

62 = 19.7 mm

64 = 20.3 mm

66 = 21 mm

68 = 21.6 mm