A steel and copper holder for 3d printer nozzles. They go in hot and cool off against the metal. The labels are millimeters for the measured extrusion width when the nozzle is clean. Total size: 8"x1" inches, holds/labels 8 nozzles. The nozzles go to a SeeMeCNC Rostock Max. SeeMeCNC sells undrilled nozzles allowing the user to drill to custom sizes.The copper wire was threaded through holes in the steel to create 1"x1" compartments. Holes were drilled with a bench press. Edges were bent back and hammered flat to avoid cuts.