Regular printer maintenance (HT90)

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The Prusa Pro HT90 is engineered for maximum efficiency and reliability. However, it is still a mechanical device with components that require regular maintenance. Follow the guidelines below to keep your printer in perfect condition for as long as possible.

Flexible steel sheets

The Prusa Pro HT90 can use three types of print sheets, Textured, Satin, or PA nylon. 

Textured sheet

Never clean a textured sheet with acetone! This will create micro-cracks in the PEI layer which will cause significant surface deterioration over time.

The surface of this sheet is covered with a special polymer (Ultem) to ensure perfect adhesion. The powder-coated steel sheets are better for printing objects with materials such as PETG, CPE, or Flexfill (TPU) which tend to adhere too much to a smooth surface, but can be more easily removed from the textured one. For all details and considerations of the Textured sheet, please see Textured steel sheet.

Satin sheet

Never clean a satin sheet with acetone! This will create micro-cracks in the PEI layer which will cause significant surface deterioration over time.

The Satin sheet further expands our line-up of print sheets. Its powder-coated surface with a lightly textured matte finish offers an optimal level of adhesion and is fully compatible with a wide range of common and less-common filaments. For all details and considerations of the Satin sheet, please see Satin steel sheet.

PA nylon sheet

Do not clean the PA nylon sheet with acetone, IPA (isopropyl alcohol), or other alcohol-based solvents (window cleaners, Windex, etc.), as this will damage the surface. Wash the special sheet before every print with clean water (use a wet cloth or sponge), then dry it. Greasy stains, such as fingerprints, can be cleaned with water with dishwashing soap. 

The special PA nylon sheet is made for printing polyamides (Nylon) since their adhesion to standard PEI sheets is generally very poor. The sheet comes with a matt texture, similar to the satin steel sheet with a PEI surface. The sheet is compatible with most polyamides and PETG, other materials may have insufficient adhesion and should be printed on our standard PEI sheets. For all details and considerations of the PA nylon sheet, please see PA nylon sheet.

Keeping the printer clean

After several hours of printing, various types of debris can start to accumulate in the printer chamber, such as filament pieces, dust, broken support remnants, etc.

Always ensure that all parts of the printer are clean. You can use a brush, a small broom, or a vacuum cleaner to remove the debris. 

Do not clean the printer while it is printing. Clean the printer only after all parts have cooled down and the printer is turned off.

Nozzle cleaning

It is fundamental for the hotend and nozzle to be clean. Check the recommended methods and instructions for cleaning a nozzle used in a high-flow print head, and in a high-temp print head. 

Filter replacement

The top part of the printer's chamber contains a housing with a HEPA filter. This filter needs to be replaced or cleaned regularly. Follow the procedure in the dedicated filter replacement article.