Ultimaker S5 Pro Bundle - Check for Debris in the Front Fan of the Print Head; Check the Quality of the Nozzle Cover

Ultimaker S5 Pro Bundle user manual 37
5.8 Check for debris in the front fan of the print head
The front fan cools the print cores during a print. This helps to prevent the heat from the nozzle
traveling too far upwards.
The fan takes in air from the front of the print head and directs it towards the print cores. Sometimes the airow
causes thin strands of lament to be sucked into the fan during a print. If strands accumulate in the fan, they
can decrease the eective cooling and eventually obstruct the fan and prevent it from spinning. Especially high-
temperature materials, such as CPE+, PC, and ABS are sensitive to this.
To check the front fan, rst gently open the front fan bracket. Blow into the front fan to see if it smoothly
spins. If it does not move at all, or stops spinning abruptly, carefully clear any obstructions from the front
fan with some tweezers.
Make sure that the print cores are completely cooled, and the printer is turned o before
performing this check.
Some lament debris can also be visible from the outside of the print head. Make sure to remove this too.
If the fan is still not spinning after removing visible lament debris, it should be replaced.
5.9 Check the quality of the nozzle cover
The nozzle cover shields the print cores from cold airow from the fans, helping the print cores to maintain a
stable temperature while printing. The cover also helps to prevent backow of material into the print head when
something goes wrong during printing.
The heat of the nozzles may cause wear on the nozzle cover over time. It is recommended to check the
quality of the cover at least once every three months. The accessory box of the Ultimaker S5 contains three
spare nozzle covers.
Examine the bottom of the print head to see if the holes where the nozzles come through are still round and the
cover still forms a good seal. Also gently open the fan bracket to check the other side of the nozzle cover.
If the nozzle cover looks like it needs to be replaced, please follow these instructions.
Remove the old cover
1. First, remove both print cores by going to the conguration overview and selecting Unload for both print cores
2. Close the print head fan bracket, and manually place the print head in the front center of the printer
3. Peel away the front corner of the nozzle cover, and pull it out of the print head fan bracket