Unclogging
Clogs can occur at various points in the filament path, including the nozzle, heat break, PTFE tube, and extruder gears. This guide will walk you through diagnosing and resolving clogs to ensure smooth filament extrusion.
Before you begin - safety and risk
Read the Safety - Before You Begin article to understand the hazards involved in working on the Vision Miner 22IDEX V4 - including electrical, thermal, mechanical, and chemical risks. All procedures in this wiki are provided as recommendations only. By choosing to follow any procedure, you do so at your own risk.
Common Clog Points
Clogs typically occur in four locations:
- Nozzle: The most common clog location, particularly when switching between high- and low-temperature materials.
- Heat Break: Clogs can form due to heat creep, where inadequate cooling allows filament to expand and block the path.
- PTFE Tube: Rarely clogs but can occur if molten filament retracts into the tube and solidifies.
- Extruder Gears: Can clog, especially when printing flexible materials or if molten filament reaches the gears, causing them to jam.
Tools and Materials
- Nozzle Torque Wrench 7mm
- Nozzle Cleaning Needle Set (0.3-0.4 mm)
- Gripping tool for the hotend
- 1 mm steel rod for clearing blockages
- Hotend Heat Break (if replacement is needed)
- Screwdrivers (for extruder disassembly)
- Camera or phone (for documenting wiring before disconnection)
1. Remove the nozzle
Preheat before removal
Always preheat the hotend to the filament's printing temperature before loosening the nozzle. This prevents the plastic from hardening and seizing the nozzle threads.
-
Preheat the tool head to the filament's printing temperature.
-
Hold the hotend with a gripping tool to prevent it from spinning.
-
Carefully loosen the nozzle using the Nozzle Torque Wrench 7mm.
-
Remove the nozzle and attempt to extrude filament. If the filament doesn't extrude, the blockage may be further up in the system.
2. Check for clogs above the nozzle
- Try to extrude filament without the nozzle attached. If extrusion fails, the blockage is in the heat break or higher.
- Insert a 1 mm steel rod from the top of the hotend and gently push through to clear any blockage. This can help push the clog out of the system.
Use needle from intake end
If the clog is near the nozzle opening, use a Nozzle Cleaning Needle Set from the intake (wider) end instead of forcing a rod down from above.
3. Remove the heat break
Cool down before disassembly
Let the machine cool down and turn it off before removing the heat break. Working on hot components risks burns and component damage.
-
Allow the printer to cool down completely and turn off the power.
-
Move the extruder's filament tension lever to the leftmost position to allow the filament to move freely.
-
Loosen the heat break holding screw and gently pull the hotend down.
-
If wires obstruct removal, disconnect them from the distribution block. Take pictures to remember their positions before disconnecting.
- Unscrew and remove the heat break. More details about disassembling the head are in the Hotend Disassembly article.
If the heat break won't come out cold
If the heat break cannot be removed while cold, preheat the hotend to help free it. Use appropriate tools to handle the hot components safely.
4. Disassemble the extruder
- Remove the fan shroud screws and then the screws on the front of the extruder.
- Check for filament binding or obstruction in the extruder gears.
-
Remove the two screws on the bottom of the extruder to release the 3D printed interface plate.
-
If filament removal is difficult, preheat the tool head to soften the filament, then pull it out from the extruder.
- Pull the interface plate out and inspect the filament path for any blockages.
5. Reassemble and test
- After clearing the filament path, reassemble the components in reverse order.
Replace damaged components
Replace components if worn extruder gears or deformed PTFE tube are found. For heat break replacement criteria, see the FAQ below.
- Move the extruder's filament tension lever to the right into the optimal position for the selected filament.
- Load filament and test extrusion. The filament should extrude smoothly without skipping or grinding.
FAQ
Support
If you could not find an answer here, reach out to our support team.