Slightly modified the spinner ring http://www.thingiverse.com/thing:188275 to show an ECG trace. I printed the ring in Colorfabb Copper and Brass filament (0.2mm layer). Better print the new thicker spinner. It's more resistant to polishing this file is for a US ring size 6.5 This is for medicine addicted! ;-)Print with 1 perimeter, layer 0.2mm, 100% infill. If you print with colorful brass and coppefill: 80 mm/sec and 210°C Polish with: sandpaper 280, 400, 600 then 1000 steel wool and then polish with metal polish cream enjoy!!