Prusa error 13530 (Marlin Request Timeout) appears on the MK4 and as #26530 on the MK4S. A firmware request sent to the Marlin motion planning layer did not receive a response within the expected time limit, causing the print system to halt.

What the Error Means

Prusa MK4-family printers run a dual-layer firmware architecture: a high-level Buddy board layer handles the UI, network, and file management, while the Marlin motion layer manages G-code execution and stepper motor control. These layers communicate over an internal interface. A Marlin Request Timeout means the high-level layer sent a command or request to the motion layer but did not get an acknowledgment in time — a scheduling race condition. This is almost always a transient firmware-level event rather than a hardware failure. It can also be triggered by G-code files containing commands or timing patterns that stall the motion queue unexpectedly.

Step-by-Step Fix

1. Restart the printer. This is the primary fix — a clean reboot resets both firmware layers and clears any stuck state between them. Most users never see this error repeat after a restart.
2. Update firmware to the latest release. Inter-layer communication scheduling issues are typically addressed in firmware updates. Download from prusa3d.com/drivers and install via USB. Check the release notes for fixes related to motion communication or timeout handling.
3. Inspect the print file for unusual G-code. If the timeout always occurs at the same point in a specific print, open the G-code file in a text editor and examine the commands around that layer height. Unusual dwell commands (G4), large arc moves, or very long continuous extrusion segments can stall the motion queue. Re-slice the file with updated PrusaSlicer settings.
4. Contact Prusa Support if the issue persists after a firmware update. Provide the firmware version, the G-code filename, and whether the timeout occurs at a consistent print layer.

Parts Required

• No replacement parts are required for this fix — this is a firmware or G-code issue

If a firmware update does not resolve recurring timeouts, contact Prusa Support at help.prusa3d.com with your printer model, firmware version, and a sample of the G-code file.

Frequently asked questions

What does Prusa 13530 mean?

Prusa error 13530 (Marlin Request Timeout) appears on the MK4 and as #26530 on the MK4S. A firmware request sent to the Marlin motion planning layer did not receive a response within the expected time limit, causing the print system to halt.

How do I fix Prusa 13530?

Prusa error 13530 means a firmware request to the Marlin motion layer timed out. Learn how to restart and update firmware to clear this transient scheduling fault.