General maintenance: Bearings, Fans, Extruder driver gear, Electronics & PEI.

Updated 10 days ago ​by Tomáš Chvalina

In general there are only a few parts you need to care of. And as prevention is the best way how to prevent future failures. We highly suggest to take care of these parts as suggested in the 3D Handbook or bellow.


Every couple hundred hours, the smooth rods should be cleaned with a paper towel. Then apply a little bit of general purpose machine oil on the smooth rods and move the axis back and forth a couple of times. This cleans the dirt and increases longevity.

If you feel the axis is not running smoothly anymore, bearings can be taken out and greased on the inside (they need to be removed from axis because the plastic lip will prevent the grease from getting inside). Super-lube, or any other multi purpose grease, will do. 


Both fans should be checked and cleaned every couple hundred hours; dust or plastic build-up can decrease their efficiency or even damage them. Computer cleaner spray will get the dust away and tweezers can be used for little plastic strands. 

Extruder driver gear

The hobbed drive gear on the extruder motor shaft can have build-up of filament shavings in the grooves and cause under-extrusion. A small brass brush is an ideal tool to clean the grooves, but a regular toothpick will do the job as well. Check and clean from the access window on both sides of the extruder assembly. Clean what you can, then rotate the gear and repeat. Nothing needs to be disassembled. Clean when you see signs of missing plastic in the objects, e.g. missing lines of extrusion. 


It is good practice to check and eventually reconnect the electrical connectors on the miniRAMBo board or Einsy miniRAMbo board. Do so after first 50 hours of printing and then every 150-200 hours. 

PEI rejuvenation

PEI can lose its adhesive powers after a couple hundred hours. Wipe it thoroughly with acetone when you see models getting loose to restore the adhesion. You can find more information how to take care of the PEI surface in PEI print surface preparation.

Do not hesitate to contact us at if you would have any following questions.

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