Anycubic error 10537 (Slice / Nozzle Size Mismatch) appears on the Kobra 3, Kobra 3 Combo, Kobra X, Kobra S1, and Kobra S1 Max when the printer detects that the nozzle diameter encoded in the G-code file does not match the nozzle diameter configured on the printer itself. The mismatch causes the printer to refuse the print job before it starts, preventing the under- or over-extrusion that would result from mismatched flow calculations.

What the Error Means

Modern Anycubic firmware embeds a nozzle diameter check at the start of every print job. When you slice a model, the slicer records the nozzle size you configured — for example, 0.4 mm — inside the G-code file header. The printer reads this value and compares it to its own nozzle setting. If the two values disagree (such as a G-code file prepared for a 0.4 mm nozzle sent to a printer set to 0.6 mm), error 10537 is raised. This situation arises most often after swapping to a non-standard nozzle without updating the slicer profile, or after loading a G-code file originally prepared for a different machine.

Step-by-Step Fix

1. On the printer touchscreen go to Settings and locate the Nozzle Diameter setting. Note the exact diameter displayed — this is the value the printer will accept.
2. Open your slicer (Anycubic Slicer, Cura, or other) and navigate to Printer Settings > Extruder > Nozzle Diameter. Set it to match the value you found on the printer’s settings screen.
3. Re-slice the model with the corrected nozzle diameter. Do not attempt to use the existing G-code file — the nozzle size is written at slice time and cannot be changed in the file after the fact.
4. Save the new G-code to a USB drive or transfer via Wi-Fi, then load and start the print from the printer touchscreen.
5. If you have physically installed a new nozzle (for example, upgrading from 0.4 mm to 0.6 mm), update the Nozzle Diameter setting on the printer’s menu to reflect the installed nozzle before re-slicing. This step is easy to forget after a hotend swap.
6. Verify the print starts without error 10537 and that the first layer extrusion width looks correct for the installed nozzle.

Parts Required

No replacement parts are required for this fix — error 10537 is a software configuration mismatch.

If error 10537 persists after re-slicing with a matching nozzle diameter, contact Anycubic support to rule out a firmware-side configuration issue.

Frequently asked questions

What does Anycubic 10537 mean?

Anycubic error 10537 (Slice / Nozzle Size Mismatch) appears on the Kobra 3, Kobra 3 Combo, Kobra X, Kobra S1, and Kobra S1 Max when the printer detects that the nozzle diameter encoded in the G-code file does not match the nozzle diameter configured on the printer itself. The mismatch causes the printer to refuse the print job before it starts, preventing the under- or over-extrusion that would result from mismatched flow calculations.

How do I fix Anycubic 10537?

Anycubic error 10537 means the nozzle diameter in your slicer does not match the printer's setting. Fix the mismatch in Anycubic Slicer on Kobra 3, Kobra X, and Kobra S1.