From E3D:

Our most advanced nozzle yet. ObXidian is our latest abrasive Nozzle offering, specifically designed for printing fibre-filled polymers. Unlike other abrasion resistant Nozzles, ObXidians copper alloy construction has a similar thermal performance to Brass, making it a true drop-in replacement. Just use the same slicer profiles as for your Brass Nozzles.
With a wear resistance that is orders of magnitude higher than any other E3D nozzle, ObXidian is really hard. Several orders of magnitude harder than Nozzle X and indeed any other generic hardened steel nozzle. This is achieved by pairing a tool steel insert with our new E3DLC coating. This specially formulated coating also embeds non-stick properties into the Nozzle itself. Meaning considerably less plastic build up around the Nozzle.
Please note:
– We do not recommend the use of abrasive materials with nozzle diameters smaller than 0.4mm.
Key features:
– Material: Copper/Hardened Steel Assembly with E3DLC coating.
– Input diameter: 1.75mm
– Maximum temperature: 300C
– Nozzles Sizes: 0.4mm, 0.6mm

ObXidian

With a wear resistance that is orders of magnitude higher than any other E3D nozzle, ObXidian is really hard. Several orders of magnitude harder than Nozzle X and any other generic hardened steel nozzle.

This is achieved by pairing a tool steel insert with our new E3DLCcoating. This specially formulated coating also embeds non-stick properties into the Nozzle itself. Meaning considerably less plastic build-up around the Nozzle.