One of the Z Ball Screws Does Not Rotating
1. Make sure that the motor wires plugs are correctly in. Disconnect and reconnect them. Sometimes one of the pins inside the motor connector is bent.
2. Make sure that the pulley on the motor is connected tightly to the shaft.
3. Make sure that the Z motor wires are firmly attached to the driver socket in the controller board.
4. Cross check the wires. Disconnect the other two motors and connect one of these wires to the motor that is not rotating to see if there is a faulty connection.
5. Release the belt that attaches the motor to the screw and try to rotate the screw manually.
6. Replace the Z driver with one of the spare drivers.
Under extrusion happens when the hot-end is not extruding enough plastic-- this could be either a consistent or inconsistent phenomenon.
Consistent Under Extrusion
Fragile prints and/or perimeters that not touching each other are signs of a consistent under extrusion.
Please check the following options:
1. Increase the printing temperature -- in some cases, a semi-clogged nozzle may provide higher flow rate at higher temperatures. Go up to 230°C with PLA to check if this helps. If so, replace the nozzle.
- A clogged nozzle may be due to dust on the filament. Use a dust filter at all times. Insert the filament through a small piece of foam to remove any particles of dust on it.
- Do not leave the hot-end at a high temperature during non-use. Whenever you are not printing, shut down the hot-end heater. Keeping it hot will degrade the filament inside the nozzle, carbonizing it inside the nozzle.
2. Check the diameter of your filament-- it might be thinner than 1.75 mm. If so, configure the slicer software to the right filament diameter.
3. Try increasing the extrusion multiplier parameter in your slicing software. Try adding 5% (1.05 in the settings) and test the effect.
Slic3r - Filament Settings (Third tab)
Simplified3D - Extruder Settings (first tab)
Inconsistent Under Extrusion
This will appear as cracks and noticeable weak layers in your prints. Usually, these type of problems are hardware related. Please check the following:
1. Extruder related
- Loose drive gear
- Loose heat block: please check if the heat block is firmly attached to the heat sink
- Check the tension on the extruder's lever spring
2. Hot-end related
- Possibly a loose particle inside the nozzle, you can clean the nozzle or, in extreme cases, replace it.
- Replace the short PTFE inside the hot-end. Make sure is not too short.
- Check the hot-end fan. Is it working smoothly? Is it covering the lower fin of the heat sink?
- Temperature stability: run the print via Pronterface and check if your temperature is stable. If not, please contact support.
- Leaks: check for plastic build up on top of the nozzle, above or below the heat block. If you see leaks, disassemble the hot-end, clean it and put it back together again.