Prusa Research i3 MK2.5, Руководство пользователя

Страница: 59 / 70

The nozzle cooling fan is made by
​
Noctua
​
. These premium fans are known for their superb
quietness and exceptional performance.
You can turn off the monitoring of Noctua fan in
​
LCD menu
​ ​
-
​ ​
Settings - Check fans
​
.
12.1.3 Extruder drive gear
The Bondtech extruder gears 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.
The Bondtech extruder gears are made from hardened carbon steel. As the gear meshing
section is constantly turning during operation it needs lubrication to reduce wear, lower the
friction and to reduce noise.
​ A lithium based grease ​ is recommended to be used. ​ Oil is not
recommended ​ since it might spread to the section where the filament is fed to the hotend.
After extensive use it is recommended to remove, clean and inspect the gears. This is also a
good time to also put some grease on the needle bearings in the secondary gear to keep the
friction low.
12.1.4 Electronics
It is a good practice to check and eventually reconnect the electrical connectors on the
miniRAMBo board. Do so after the first 50 hours of printing and then every 150-200 hours.
12.1.5 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.
12.2 Print surface preparation
Print surface preparation is described in
​
6.2.2 Flexible steel sheet surface preparation
chapter.
12.3 Filament sensor
The optical filament sensor detects the presence of filament and also its movement. Make
sure you are running the latest firmware as we have increased the FPS of the sensor and
improved its reliability. The filament sensor can detect:
● Running out of filament
● Filament getting stuck - jammed nozzle
59