> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.simplyprint.io/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Nozzle doesn't match (size, type or volume): a queue nozzle mismatch

# Nozzle doesn't match (size, type or volume): a queue nozzle mismatch

A free printer won't pick up your queue item, and the inspector (or the printer) says the reason is the nozzle. It's a quick fix.

## What this means

SimplyPrint uses **tags** to route the right files to the right printers - so a job only runs on a printer that can actually print it correctly, and you don't waste time and filament printing something on the wrong setup. A file or queue item can be tagged with details like its material, color, nozzle size and bed type, and SimplyPrint also checks things like whether the model fits and whether the printer can run the file. When a printer doesn't meet one of the item's requirements, the two won't match, and the item won't start on that printer.

In this case, the item needs a specific nozzle and the printer has a different one. Nozzle size (for example 0.4mm vs 0.6mm) is an exact match and is checked by default; nozzle type (like hardened steel) and nozzle volume (like high flow) are also matchable but are off by default.

## How to fix it

- Fit the nozzle the item needs on that printer, then update its nozzle in SimplyPrint.
- If the item's nozzle tag is wrong, correct it on the item.
- If you don't care about nozzle type or volume, leave those two checks off (they already are by default).

## Learn more

| For every reason a printer won't take a queue item, and how the inspector pinpoints which one, see the full guide.

[Why won't my printer print this queue item? Using the queue inspector](https://help.simplyprint.io/en/article/why-wont-my-printer-print-this-queue-item-using-the-queue-inspector-1ue6woy/#2-nozzle-size-type-or-volume)