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V6 Hardened Steel Nozzle -1.75mm x 0.25mm-0.8mmDesigned to resist the abrasion of materials filled with abrasive particles which act like liquid sandpaper on your nozzle. Carbon-fibre is a particularly abrasive and well known example for which these nozzles are ideal. Materials filled with metal powders can also be abrasive, as can glow in the dark pigments. Hardened steel nozzles are nearly impervious to wear and should last as long as your printer. Hardened steel nozzles are also very resilient to being damaged by things like crashing into glass, bulldog clips or getting mangled when you're too lazy to find the correct size 7mm spanner and use pliers instead, we know you do it. You can use a wire brush to clean a hardened nozzle without damaging it.Hardened steel is somewhat less thermally conductive than brass, however, in our testing this does not seem to have a noticeable impact on actual performance and print speed. Probably because the limiting factor is the conductivity of the filament, not the nozzle. If you are experiencing under-extrusion when switching over from brass or copper, we recommend that you increase your print temperature slightly until the results are deemed acceptable. Hardened nozzles are brittle, it is extremely hard to break one but if you do manage, they tend to crack rather than deform. Hardened steel nozzles are so hard that they can score and damage even glass print surfaces if dragged across the surface with force.Hardened steel nozzles are good utility nozzles, suitable for abrasive filaments such as wood fills, glitter fills and metal fills. Even glow-in-the-dark filaments will abrade brass so our Hardened Steel nozzles are a great, lower-cost option when you can’t stretch to a Nozzle X. Rated to a maximum temperature of 500°C. Please note this nozzle is not suitable for printing abrasive filaments at temperatures above 350°C.