Summary

Tapered rings that may be conveniently used as cutting/marking guides about the circumference of rocket body tubes. The STLs supplied here worked well for on my printer but you'll probably want to use the Customizer to generate files specifically for your own printer tolerances.

Outer diameters for Estes body tubes (Ref: http://www.estesrockets.com):
BT-5: 13.8mm
BT-20: 18.7mm
BT-50: 24.8mm
BT-55: 34.0mm
BT-60: 42.0mm