Nozzle Wear Estimator
Abrasive filament eats through a nozzle far faster than standard plastics — here's roughly where yours stands.
Why abrasive filaments are so hard on a nozzle
Carbon fiber, glass fiber, and metal-fill filaments all contain hard particulate suspended in the base plastic, which continuously scrapes against the nozzle's inner bore as it extrudes — brass is soft enough that this wear shows up in tens of hours rather than the hundreds or thousands a standard filament allows.
Hardened steel and ruby-tipped nozzles exist specifically for this
A hardened steel nozzle resists abrasive wear far longer than brass, though it also transfers heat slightly less efficiently, which can matter for some high-flow setups. A ruby-tipped nozzle puts a wear-resistant synthetic ruby insert right at the tip — the single point of most extreme wear — and holds up longest of the common options when abrasives are a regular part of the print queue.
Watch for the real symptoms, not just the hour count
A worn nozzle's actual bore diameter grows slightly larger than its rated size, which shows up as inconsistent extrusion width, slightly under-extruded-looking prints even with correct settings, or a widening of the first layer beyond what the slicer expects. Treat the estimate here as a planning guide for when to inspect closely, not a hard replace-by date.