3D Printer Maintenance: What to Check and When

Most printers give small warnings before something breaks: a belt that has gone slightly loose, a nozzle with plastic building up on the tip, an extruder gear clogged with dust. If you check these at regular intervals, most faults such as layer shifting, a clogged nozzle and first-layer problems never happen. The list below shows what to do and how often. Most items take only a few minutes.

Safety first

• Switch the printer off and unplug it for mechanical work and electrical checks.
• Do not touch the nozzle or bed until they have cooled. Wear gloves for any task that has to be done with a hot nozzle.
• Do not open the power supply. The capacitors inside can hold a charge even after the plug is pulled.

Before every print

• Check the bed: If there is dust, a fingerprint or plastic residue on the surface, wipe it with isopropyl alcohol (IPA).
• Check the nozzle tip: If plastic is stuck to the tip, clean it with a brass brush or tweezers while the nozzle is hot.
• Check the filament path: Does the spool turn freely? Is the filament tangled?

Weekly maintenance

If you run a few prints a week:

1. Deep-clean the bed. Wash the PEI plate with warm water and dish soap and dry it well. This removes the oily film that IPA cannot.
2. Clear the dust. Brush or blow dust off the printer and out of the fans.
3. Check the extruder gear. Clean plastic dust from the teeth with an old toothbrush.
4. Watch the first layer. If it starts to degrade, check the bed leveling and the Z offset.

Monthly maintenance

1. Check belt tension. Belts should show slight resistance when pressed with a finger. A loose belt causes ghosting and layer shifting.
2. Check the screws. Screws on the frame, toolhead and bed carriage work loose with vibration. Go through them one by one with a set of hex keys.
3. Check the pulley set screws. If the screws on the motor shaft pulleys loosen, the axis loses its position.
4. Check the wheels and rails. On V-slot wheels, look for play, flat spots or cracks. Adjust the eccentric nuts.
5. Clean and lubricate the Z lead screw. Remove old grease and dust and apply a thin coat of the lubricant the manufacturer recommends. Too much attracts dust.
6. Clean the linear rails and rods. Wipe with a lint-free cloth and apply a very small amount of the recommended lubricant.
7. Check the fans. The hotend fan and part cooling fan should spin smoothly and quietly. If you hear rattling or they slow down, clean or replace them. A stopped hotend fan leads to clogs.

Every three months, or as needed

1. Check the nozzle. Replace it if the hole is worn or the tip is deformed. Check more often if you use abrasive filament (carbon fiber, glass fiber, glow-in-the-dark).
2. Check the Bowden tube. The nozzle end of the tube degrades from heat over time. If the end is melted or narrowed, cut it square or replace it. Make sure the tube fittings sit tight.
3. Check the cables. Look for wear, crushing or loose connections on moving cables, especially the bed and toolhead cables. The bed cable connector is one of the points most affected by constant movement.
4. Update software. Update your slicer and, if needed, the printer firmware. After a firmware update, check that your calibration values were kept.

Yearly, or after a major change

1. Repeat the calibrations: E-steps, PID and flow.
2. Evaluate the build plate. PEI wears over time, and adhesion drops in shiny areas. Replace it if needed.
3. Check frame squareness. Make sure the frame is upright and square.
4. Check electronics cooling. Clean the control board and power supply fans of dust.

Maintenance checklist

Supplies you need

• Isopropyl alcohol (90% or higher) and a lint-free cloth.
• A set of hex keys and small wrenches.
• A brass wire brush and an old toothbrush.
• The lubricant or grease the manufacturer recommends.
• A spare nozzle and a cleaning needle.
• A spare Bowden tube (for Bowden printers).

Do not forget the filament

Filament is part of maintenance. Damp, dusty filament both ruins quality and clogs the nozzle. Keep filament in a sealed box with silica gel. Here is how: How to dry and store filament.

Frequently asked questions

Which lubricant should I use?

Use the manufacturer's recommendation. In general, a light grease is used on Z lead screws, and a light machine oil or PTFE-based lubricant on linear rails and rods. On V-slot systems with wheels, do not lubricate the profiles the wheels run on.

What should I do if I will not use the printer for a long time?

Take the filament out and store it in a dry box, and cover the printer to keep dust off. When you start using it again, check the bed leveling and Z offset.