High temperature print head (HT90)

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The Prusa Pro HT90 comes with a high-temperature print head that can be installed in the printer.

The print head can print up to 500 ºC. This printing temperature covers most available materials, including PEI (Ultem). The nozzle is also abrasion-resistant.

When starting the print, the print head has a manual flap adjustment for the cooling fan. The flap controls the airflow from the cooling fan, from closed to (fully) open. 

Before the start of a print, the printer shows the recommended adjustment, based on the loaded GCode.

Nozzle

The high-temperature print head has a 0.6mm Revo high-temperature, high-flow, abrasion-resistant nozzle. The nozzles are composed of copper with a hardened steel tip, and coated with chromium nitride.

The nozzle can be changed by screwing and unscrewing by hand, no tools should be used. For that, follow the instructions here: Nozzle replacement (HT90) [Tłumaczenie w toku].

• Recommended cleaning methods:
  • • Cleaning filament
    • Warm pull
    • Cold pull
    • Brass brush for the outside
• Non-recommended cleaning methods:
  • • Needle
    • Steel wire brush
    • Brow torch

The hardness of the HT-Abrasive coating can cause small particles to detach from the bristles of the brass brush and create dusting over the nozzle. This will give the nozzle a brass-coloured sheen. However, the coating itself is still very much intact, and there will be no compromise to wear performance.