⬢The Filament guide is an optional accessory for your Original Prusa MK4 printer. When printing tall objects with a full filament spool, this accessory prevents filament tangling if it falls off the spool to the side.
⬢Where to get the Filament guide?
⬢Factory-assembled printers include the guide (marked E1) and fasteners in the package.
⬢A G-code pre-sliced for PLA (marked R1) can be found on the bundled USB flash drive.
An editable 3MF file can be found on Printables
or in the drivers' package.
Note that marking on the printed parts is either Ex for factory printed, on Rx for self-printed. The geometry is the same.