Ring with geometrical butterfly, inner diameter 20mm, Good result with an Ender-3 (FDM) printer but I think the result would be even better with a res...in printer.
#ANYCUBIC3D
3d model print parameters
Printed with an Ender-3 under Cura
Layer: 0.12mm
Printing speed: 20mm/s
Bracket: yes, 59 ...