Nozzle set

The G1 uses interchangeable nozzles that determine the line width (extrusion width) and therefore the speed and detail of prints. The nozzle screws onto the bottom of the barrel.

Available sizes

The full nozzle set sold for the G1 is 1 mm, 1.8 mm, 3 mm, 5 mm, and 8 mm (see the Ginger shop).

Nozzle	Line width	Best for
1 mm	Fine detail, slow prints	Small objects, high detail, delicate structures
1.8 mm	Fine-medium	PETG and rPLA with small nozzle (lower Feeding Zone temp needed)
3 mm	General purpose	Most design objects, standard production
5 mm	Medium-large	Larger parts where 8 mm is too coarse
8 mm	Large, fast prints	Furniture, large structural parts, fast prototyping

Nozzle material

The G1 nozzle is made from hardened stainless steel, designed for:

• Glass fiber (GF) reinforced materials
• Carbon fiber (CF) filled materials
• Recycled pellets with abrasive fines

No special nozzle upgrade is needed for abrasive materials — the standard nozzle handles them.

Layer height rule

Set layer height to approximately 50–70% of the nozzle diameter:

Nozzle	Recommended layer height
1 mm	0.4–0.7 mm
1.8 mm	0.9–1.25 mm
3 mm	1.5–2.5 mm
5 mm	2–3.5 mm
8 mm	3–5 mm

Exceeding this ratio causes the nozzle to drag on the previous layer, leading to apparent “layer shift” or surface defects.

When to replace the nozzle

Signs of a worn nozzle:

• Inconsistent line width even after Rotation Volume calibration
• Visible scoring or denting at the nozzle tip (from collision with the print or bed)
• Extrusion becomes irregular without any change in material or settings

A nozzle can also be damaged by:

• Crashing into the bed during homing (if Z offset is incorrect)
• Printing at excessive speed above Max Volumetric Speed
• Physical impact

Installation requirement: PTFE tape

Every new nozzle must have PTFE tape (teflon tape) wrapped for 3 turns around the thread before installation. This seals the thread against the barrel and prevents molten plastic from leaking along the thread during printing.

Caution

Omitting the PTFE tape causes plastic leaks along the thread. Always apply 3 turns before installing any nozzle — new or reinstalled.

Replacement procedure

The easiest way to replace the nozzle is to use the built-in CHANGE_NOZZLE macro from the printer display:

1. From the KlipperScreen display, open Macros and run CHANGE_NOZZLE
2. The guided procedure walks through 5 steps — it positions the printhead automatically and manages temperatures
3. See the full step-by-step guide: Nozzle replacement

If performing the replacement manually:

Caution

Always heat the nozzle to printing temperature before removing it. Removing a cold nozzle can strip the threads.

1. Heat all zones to printing temperature (e.g. 220°C for PLA)
2. Hold the barrel with a wrench (do not apply torque to the barrel body)
3. Unscrew the old nozzle counterclockwise
4. Thread the new nozzle on finger-tight while hot
5. Tighten gently with a wrench — do not overtighten
6. After cooling and reheating, re-check tightness
7. Recalibrate Z offset and first layer — a new nozzle changes the Z reference

Ordering

Spare nozzles are available from Ginger Additive:

• 3 mm nozzle: ~€25 + shipping (price as of 2024)
• 5 mm nozzle: available on request
• Other sizes: check the Ginger shop

Related notes

• Layer shift and quality issues — layer height vs nozzle size ratio
• Nozzle and barrel clog — cleaning a clogged nozzle
• Barrel clog purging procedure — full purge when nozzle is severely blocked
• Z offset and first layer — recalibrate after nozzle change
• Max Volumetric Speed — maximum flow rate per nozzle size