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Clean Nozzle

Interval: Every 14 days (every 5 spools PLA/PETG, every 2 spools CF)
Difficulty: Easy
Time: 10 minutes
Applies to: C235, C335, C435

Why

Carbon buildup and filament residue accumulate inside the nozzle, causing:

  • Under-extrusion
  • Stringing and oozing
  • Inconsistent first layers
  • Partial clogs that clear and return

What You Need

  • Acupuncture needle (0.3mm or 0.35mm)
  • Cleaning filament or nylon filament for cold pull
  • Brass wire brush (optional)

1. Heat to printing temperature

Heat the nozzle to your usual print temperature (e.g., 210C for PLA).

2. Push cleaning filament

Manually push cleaning filament (or nylon) through the hotend until it comes out clean.

3. Cool down to 90C

Let the nozzle cool to 90C (for nylon) or 80C (for PLA).

4. Pull firmly

Pull the filament out with a firm tug. The tip should come out with a clean cone shape carrying debris.

5. Repeat

Repeat 2-3 times until the pulled filament tip is clean.

Method 2: Needle Clean

1. Heat the nozzle

Heat to 210C.

2. Insert needle from below

Carefully insert the acupuncture needle into the nozzle opening from below. Move it up and down gently.

3. Extrude

Push some filament through to flush out debris.

Mark as done

On your SmartPad: Menu > More > Maintenance > Clean Nozzle > Done

Tips

  • With carbon fiber filaments, clean every 2 spools — CF is abrasive
  • If you switch between materials often, do a cold pull at each switch
  • A brass wire brush on the outside of the nozzle removes burnt filament