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!!