Ultimaker 3 Extended Guida

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Maintenance

How to perform a hot and cold pull

February 04, 2020 10:10

Cleaning filament can be used to clean the print core by applying hot and cold pulls. Hot

pulls are used to get the biggest parts of degraded material out of the print core and are

necessary when a print core is clogged. With a cold pull, the remaining small particles

will be pulled out, ensuring the print core is completely clean.

Preparation

Navigate to the print core cleaning procedure on your printer:

Go to

Preferences

→

Maintenance

→

Print head

→

Print core cleaning

on Ultimaker

S-line printers

Go to

System

→

Maintenance

→

PrintCore

on the Ultimaker 3

Select the print core you want to clean:

print core 1

or

print core 2

Select the material you want to use for cleaning:

Cleaning �lament

or

PLA �lament

Wait for the printer to heat up the print core and to retract the filament until its end is

visible in the Bowden tube

Remove the Bowden tube from the print head. First, remove the clamp clip and then

push down on the tube coupling collet while pulling the Bowden tube upwards, out of

the print head.

Con�rm

to continue

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How to perform a hot and cold pull – Ultimaker... https://support.ultimaker.com/hc/en-us/articles/...

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Hot pull

Insert the filament into the print head until you feel some resistance

Hold the filament with pliers and gently apply pressure to the material for ±1 second

so that it extrudes from the print core or until it cannot be pushed any further, and

directly pull the filament out with a quick, firm pull

Cut off the tip of the filament that you have just pulled out.

Check the color and the shape of the tip of the filament and compare it with the

image below. The goal is to have a clean tip

Repeat this procedure until there is no more degraded material visible on the tip of

the cleaning filament. The tip of the filament should look as clean as the example

below

Caution:

Use pliers to prevent injuries to your hands in case the material breaks.

Caution:

Do not use a needle to unclog the CC print core. If the point of needle

touches the ruby, this can irreparably damage it.

How to perform a hot and cold pull – Ultimaker... https://support.ultimaker.com/hc/en-us/articles/...

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Once the tip of the filament is clean, manually flush some filament through the print

core with pliers and take it out again.

Con�rm

to continue

How to perform a hot and cold pull – Ultimaker... https://support.ultimaker.com/hc/en-us/articles/...

3 of 7 12/15/20, 2:15 PM

Cold pull

Insert the filament into the print head until you feel some resistance

Hold the filament with pliers and gently apply pressure to extrude some material.

Con�rm

to continue

Maintain pressure on the filament with the pliers for the duration of the progress bar

Release the filament and wait until the print core has cooled down

Grab the filament with pliers and pull it out with a quick, firm pull.

Con�rm

to continue

Take a look at the tip of the filament and see if it has a clean, cone-shaped tip like the

example to the right.

Con�rm

to continue

How to perform a hot and cold pull – Ultimaker... https://support.ultimaker.com/hc/en-us/articles/...

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Tip:

If the tip of the filament is not clean, go back to hot pull or cold pull to repeat the

How to perform a hot and cold pull – Ultimaker... https://support.ultimaker.com/hc/en-us/articles/...

5 of 7 12/15/20, 2:15 PM

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Reassembly

Insert the Bowden tube into the print head and secure with the clamp clip.

Con�rm

to

continue

Wait for the Ultimaker printer to finalize the cleaning procedure

cleaning steps.

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

Print core cleaning maintenance schedule



Print core troubleshooting



How to perform a hot and cold pull



Print core cleaning maintenance schedule

How to perform a hot and cold pull – Ultimaker... https://support.ultimaker.com/hc/en-us/articles/...

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

Cleaning the Ultimaker 3



Check the quality of the silicone nozzle cover



Check for residue in the front fan of the print head



Check the tension of the short belts

How to perform a hot and cold pull – Ultimaker... https://support.ultimaker.com/hc/en-us/articles/...

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