Is there any convention on how to mark an all metal hotend to distinguish it from a hotend with a PTFE tube in the heatbreak? Once assembled for a German Riprap 3D printer, they look exactly the same on the outside. I'm trying to decide on a way of marking them to indicate the difference.
Exposed part of heatbreak between heater block and heatsink
Easy to see PTFE tube on nozzle side of heatbreak (all metal hotend has an all metal heatbreak with no PTFE)
Even after removing heatsink, PTFE tube is difficult to see in heatbreak (all metal hotend has an all metal heatbreak with no PTFE)
Nozzle end of all metal heatbreak