“0.4 mm” describes an outlet size. It does not identify the mounting system. Before ordering, match the replacement to the hotend that is actually installed.
Fill in this compatibility card
| Field | What to record |
|---|---|
| Printer and hotend | Exact model, plus any hotend upgrade |
| Nozzle system | The manufacturer’s part family or part number |
| Adapter | Whether one is required and which one |
| Filament and diameter | Required abrasion resistance and supported outlet size |
| Installation | The matching service guide, not a generic nozzle-change video |
An adapter can change the answer
Prusa documents a Nextruder V6 Nozzle Adapter for compatible Nextruder-equipped printers. The adapter is a distinct component: a V6 nozzle is not interchangeable with a complete Nextruder nozzle simply because the outlet diameter matches.
The seller says “fits Prusa”
Ask which nozzle system and printer configuration the claim covers. Save the part number and compatibility statement with your order. A brand name is too broad to resolve an adapter requirement.
I have an aftermarket hotend
Start with that hotend maker’s compatibility information. The printer’s original nozzle list describes the factory configuration and may no longer identify the correct replacement.
I want a different outlet diameter too
Treat fit and print settings as separate checks. Once the hardware is matched, select the appropriate nozzle profile. Our 0.4-versus-0.6 mm guide explains the print-planning trade-off.
Ready to order?
You should be able to name the exact part, any required adapter and the installation guide. If one of those is unresolved, finish that check before disassembly. A spare is useful only when you can identify where and how it fits.
