The fans on each side of the print head activate during a print. This ensures that the current layer of filament is properly cooled before the next layer begins. Most materials require this extra cooling to retain optimal print quality.
If the fans do not activate during a print, they need to be replaced. The following steps describe how to correctly replace the model cooling fans:
⚠ Caution: Make sure the filament is removed, the Ultimaker is turned off and power supply disconnected before you start the replacement.
- 1 or 2x 1313 Model cooling fan
- 2.0 hex screwdriver
- Phillips screwdriver
- Blue tape
- Cutting pliers or scissors
- Electrical or duct tape (optional)
- Print head alignment aid
- 15 minutes
1. Remove the clamp clip
- Place the print head in the front-right corner.
- Use your fingernail to remove the blue clamp clip.
2. Remove the Bowden tube
- Press down on the white tube coupling collet.
- At the same time, pull the Bowden tube upwards, out of the print head.
3. Remove the print head from the printer
- Pull the Y print head shaft forward so it snaps out of the sliding blocks.
- Tilt the left and right sliding blocks so that the X print head shaft also comes loose.
- Rotate the print head 45 degrees so you can lift the print head and shafts out of the printer.
- Place the print head shafts aside.
4. Loosen the print head housing
- Loosen the four thumb screws and remove them from the print head.
5. Remove the linear bearings
- Take the three pieces of the print head housing apart and remove the two linear bearings.
- Slide the first braided sleeve clip upwards over the Bowden tube and move the print head housing parts upwards too to keep them out of the way.
✔ Tip: The print head parts can easily slide downwards again over the braided sleeve and get in the way. Use some tape to keep them in place.
6. Remove the shrink sleeve
- Pull the braided sleeve out of the shrink sleeve.
- Use cutting pliers or scissors to cut the shrink sleeve open. This is necessary to be able to reach the fans’ plugs.
⚠ Caution: Be very careful to not cut any wires when cutting open the shrink sleeve.
7. Disconnect the fans
- Move the braided sleeve upwards to expose the fan plugs.
- Disconnect the model cooling fans connected to the green-yellow wires.
⚠ Caution: The wires of the fans, and in particular their connections to the plugs, are very fragile. Only handle the connections by their plugs and avoid putting pressure on the wires to avoid breaking any connections.
8. Loosen the model cooling fans
- Firmly hold the fan bracket.
- Use a Phillips screwdriver to remove the four screws from each model cooling fan.
1. Attach the new model cooling fans
- Place the fans on the fan bracket, making sure that the wires are on the back side of the print head.
- Use a Phillips screwdriver to tighten the bolts.
✔ Tip: The screws are self-tapping, but may require some downwards pressure to be secured properly.
2. Connect the fans
- Connect the model cooling fans to the green-yellow wires.
✔ Tip: It does not matter which model cooling fan is connected to which plug.
3. Slide the braided sleeve down
- Slide the braided sleeve down again over all the connectors.
✔ Tip: To make sure that the end of the sleeve stays in place after reassembly, a piece of tape can be put tightly around the end of the braided sleeve, to replace the shrink sleeve. Use electrical tape or duct tape, not blue tape.
4. Place the bottom print head housing segment
- Put the bottom segment of the print head housing on the hot end, with the opening for the linear bearing on the back and front.
- Place a linear bearing in the part, while keeping all the wires in the back-left corner.
5. Place the middle print head housing segment
- Put the middle housing part on top of the linear bearing.
- Place the other bearing on top, still keeping all the wires in the back-left corner.
6. Place the print head housing top
- Put the top part of the print head housing over the linear bearing, with the tube coupling collet towards the front.
- Put the four thumb screws through the print head housing and loosely secure them.
✔ Tip: While assembling the print head housing, continuously pay attention to the cables at the back of the print head. Make sure that the heater cartridge, PT100 sensor and the fan wires stay in position. If they overlap, this may obstruct the rotation of the hot end fan.
7. Align the linear bearings
- Check the inside of the linear bearings and rotate them until they are correctly oriented.
- The linear balls inside the bearing should be in an X pattern. This is to evenly distribute the weight and pressure of the print head over the bearings, which benefits print quality.
8. Tighten the thumb screws
- Completely tighten the two thumb screws in the back of the print head by hand.
- Place the print head alignment aid in between the hot end top and hot end bottom.
- Tighten the thumb screws so that the tool sits firmly in between the hot end parts but can still be taken out easily.
9. Insert the print head shafts through the print head
- The longer axle is the X print head shaft, it goes through the upper linear bearing.
- The shorter axle is the Y print head shaft, it goes through the lower linear bearing.
10. Replace the print head back in the gantry system
- Put the print head in its original position and align the print head shafts with their sliding blocks.
- Make sure that the ends of the axles are all in between the belts.
11. Secure the X print head shaft
- Tilt the left and right sliding blocks to be able to place the print head shaft X in the notch. Make sure that the end of the shaft is 1 mm from the left panel.
- While supporting the bottom of the sliding block, push down on the end of the shaft until it clicks into place. Do this for both sides.
✔ Tip: Check if the print head shaft X is activating the Y limit switch. If not, remove print head shaft X and click it in place further to the left.
12. Secure the Y print head shaft
- Tilt the front and back sliding blocks to be able to place the print head shaft Y in the notch. Make sure that the shaft is exactly in the middle.
- Pull the end of the axle upwards until it clicks into place. Do this for both sides.
✔ Tip: Check if all four sliding blocks are completely upright and not tilted.
13. Insert the Bowden tube into the print head
- Press down on the tube coupling collet in the print head.
- Push the Bowden tube all the way in.
14. Ensure the Bowden tube is correctly inserted
- Let go of the tube coupling collet and gently pull the Bowden tube, along with the tube coupling collet, approximately 2 mm upwards.
- Hold the tube coupling collet up with your fingernail.
- While holding the tube coupling collet up, push the Bowden tube down again.
15. Secure the clamp clip
- Place the blue clamp clip around the tube coupling collet to secure the Bowden tube.
16. Divide the clips
- Evenly divide the clips over the Bowden tube and braided sleeve.
- Make sure to keep the braided sleeve on the left of the Bowden tube.