![Introduction](https://cdn.help.prusa3d.com/wp-content/uploads/2024/08/bdc79bdd67e391f0368b498c8e8d4642_painted.jpeg)
⬢This guide will take you through the Hotend assembly replacement on your Original Prusa MK4S or MK3.9S.
The following instructions are compatible with all Prusa Nozzle diameters.
⬢All necessary parts are available in our eshop prusa3d.com.
Note that you have to be logged in to have access to the spare parts section.