Bambu Lab A1 Nozzle Size: 0.4 mm Included, 0.2, 0.6 and 0.8 mm Options Explained

What the A1 nozzle sizes mean in practice

Bambu Lab’s specification table has one nozzle line: 0.4 mm Stainless Steel included, followed by the optional diameters. Counted together, that is four sizes: the one in the box and three alternatives. The table below puts the four side by side and shows what Bambu Lab states for each. A blank means Bambu Lab’s documents say nothing, and this page does not fill it in.

Default, standard or stock nozzle size: 0.4 mm

If you are asking what comes in the box, the answer is the 0.4 mm nozzle, and its material is stainless steel. Every other size is a choice you make, not a part that ships with the printer. The packing list on Bambu Lab’s wiki also shows a Combo version that adds the AMS lite body. The nozzle line comes from the A1 specification table, which this page reads as the printer’s own figure.

Which material comes with which size

Bambu Lab’s nozzle page lists an A Series Nozzle in Hardened steel / Stainless steel, in sizes 0.2, 0.4, 0.6 and 0.8 mm, with a maximum printing temperature of 300 °C, and names the A1 among the printers it fits. It does not say which size is offered in which material. So this page confirms the four diameters and the two materials, and it does not pair them: if you want a particular size in hardened steel, check the product listing for that size before you order.

Nozzle diameter and layer height are separate questions

The sources behind this page give no layer height range for the A1, and none per nozzle size. Which means this page cannot tell you the thinnest or thickest layer for 0.2 or 0.8 mm. That range comes from your slicer profile for the nozzle you fit.

Nozzle size and filament: what Bambu Lab states

Bambu Lab’s specification table sorts filaments into tiers. Rated Ideal are PLA, PETG, TPU and PVA. Rated Not Recommended are ABS, ASA, PC, PA, PET, Carbon/Glass Fiber Reinforced Polymer. These tiers belong to the printer, not to a nozzle diameter: the table does not give a separate list for 0.2, 0.6 or 0.8 mm.

The nozzle does enter the picture for fiber-filled filament. Bambu Lab’s A1 FAQ says PLA-CF/GF and PETG-CF/GF (carbon or glass fiber filled) are not recommended with the stainless steel nozzle, and that they become possible after replacing it with a hardened steel nozzle. The nozzle included with the A1 is stainless steel, which means the 0.4 mm nozzle in the box is not the one Bambu Lab points to for these filaments. The A Series nozzle list does include hardened steel, and that is the material the FAQ names for the swap.

For ABS, ASA, PC and PA, the FAQ’s reason is not the nozzle: the open-frame design and lower chamber temperature reduce interlayer strength and raise warping risk. The same FAQ allows small, low-infill models. The FAQ also states “We don’t recommend enclosing the A1.” So a different nozzle size does not change that part of the story.

The hot end behind the nozzle

The specification table lists the hot end as All-Metal, with a maximum temperature of 300 °C. Bambu Lab’s nozzles page gives the same 300 °C for the A Series nozzle in both materials and in all four diameters, so the ceiling does not change with the diameter you pick. Bambu Lab’s nozzle compatibility table also lists an A1 Series Hotend as a unit that fits the A1 mini, the A1 and the A2L. The nozzles page also says the A Series nozzle is easily detached from the heating assembly, which it presents as making replacement as hassle-free as possible; it does not list a tool or a step-by-step procedure.

Several other numbers also stay put when you change the diameter. The table states a maximum speed of 500 mm/s and a maximum acceleration of 10000 mm/s² for the tool head, a build volume of 256*256*256 mm³ and a maximum build plate temperature of 100 °C. Bambu Lab gives no separate speed figure for each nozzle size, so this page does not either.

The practical reading is simple. The nozzle question on the A1 is a choice among four listed diameters, with 0.4 mm stainless steel as the one that ships, and the main nozzle-related caution Bambu Lab states is about fiber-filled filament and the stainless steel nozzle.