Original Prusa MK3.9S | Prusa Knowledge Base

Upgrade to MK3.9S from MK3/MK3S/MK3S+

Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade

12 chapters

Moderate

Begin assembly

Upgrade to MK3.9S from MK3.9

Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade

8 chapters

Moderate

Begin assembly

Get started with MK3.9S

How to update firmware (CORE One L, CORE One, MK4/S, MK3.9/S, MK3.5/S, XL)

On the Prusa CORE One L, Prusa CORE One/+, Original Prusa MK4/S, MK3.9/S, MK3.5/S, and XL, the firmware is flashed using a USB flash drive. This is valid for all ways of firmware…

Prusa Connect and PrusaLink explained

Prusa Connect and PrusaLink are two remote printing solutions developed in-house by Prusa. Its origin is in the management system used in our record-sized print farm located in…

Shipping information

Current lead time estimates for new orders Updated: December 10th, 2025 --> The dates are only an estimation…

Fix common issues

Changing or replacing the Prusa Nozzle

Replacing the Prusa Nozzle on your printer varies depending on the model of your printer. This article provides an overview of the different methods to replace the Prusa Nozzle,…

Warping

When printing large objects, you can sometimes run into an issue with the corners of the object being lifted from the bed – mostly when printing with high-temperature materials…