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

Updated 3 weeks ago ​by Martin Lexa

In order to prevent any possible print failures, we highly recommend taking regular care of the following parts (as suggested also in the 3D Printing Handbook you have received with your printer).

Rods and bearings

After a few hundred print-time hours, or, by contrast, in case the printer stands idle for a few weeks in a dusty room, the smooth rods should be cleaned with a paper towel. Then apply a little bit of lubricant on the smooth rods and move the heatbed/extruder back and forth a couple of times. If you feel the axis is not moving smoothly when moving it by hand from one side to another, you can take the bearings out and lubricate them on the inside (they need to be removed from the smooth rod in this case).

As for the type of lubricant, the best option is to use our lubricant (available in our online store). Using oils such as the WD-40 is not optimal, as the thin substance may not bring as much lubrication as needed. On the other hand, denser greases may accumulate dust over time, which may cause even more damage to the bearings at the end of the day.

According to our testers, the best lubricant is a homogeneous, soft grease with lithium additives, As for some third party products, GLEIT-µ HF 400 or Mogul LV 2-EP are great. In general, Super-lube or any other multi-purpose grease will do fine as well.
Please refer to this guide for more information about how to apply the lubricant.

Fans

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 (canned air) will get the dust away and tweezers can be used for little plastic strands. 

Both extruder and part cooling fans measure current RPM (Revolutions Per Minute). Because of that, they can detect any problem that will cause the fan to slow down, like a piece of filament getting stuck in it. If you get a fan error, check that it can rotate freely; clear any

debris that may be stuck in it. You can turn off the monitoring in the LCD menu - Settings - Check fans for example if you replaced one of the fans with a replacement not supporting RPM sensing.

Extruder driver gear

The hobbed drive gear on the extruder motor shaft can have a 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.

In case the gears are noisy, you can again use the same homogeneous, soft grease with lithium additives, such as the one available on our online store. Apply a tiny amount of the grease only to the teeth protruding outwards, MAKE SURE THE GREASE DOES NOT GET INTO CONTACT WITH THE FILAMENT.

Electronics

It is good practice to check and eventually unplug and re-plug the electrical connectors on the mini RAMBo board or EINSY RAMBo board. Do so after the first 50 hours of printing and then every 150-200 hours. Special attention should be paid to the cables from the PSU (power source) and heaters. Make sure it's all connected firmly all the way in.

PEI print surface preparation

PEI can lose its adhesive powers after a couple hundred hours. You can wash it with soap and dish soap and water, remember to wipe it dry afterward! You can find more information on how to take care of the PEI surface in PEI print surface preparation.


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