Prusa i3 MK3S: Changing Materials

If the filament is not loaded in the extruder, skip to the next step

On the prusa interface select the unload filament option

Select the material you are unloading

Generally is PLA or PTEG

Wait for the extruder to heat up

The extruder and print bed will get hot during this process

Press the knob and wait for the filament to finish unloading

Ejecting filament removes it from the MMU, if there is no filament loaded, skip to the next step

Select "eject filament"

Select the filament number you wish to remove

The MMU will push the filament forward

Cut the tip at a 45 degree angle

There is typically a bulbous end which can get stuck in the PTFE tube

Pull the filament from the PTFE tubes on the 8 ft shelf above the machine

Wind the filament back onto the spool

Thread the end through the two holes on the spool

Store the filament spool in a cool dry place preferably in a bag with silica packets

Cut the filament at a 45 degree angle

Feed the filament through one of the PTFE tubes above the printer

Select "load filament"

Select the filament number you are loading

The MMU will have a blinking light above the filament number selected

Slowly push the filament through the PTFE tube until you can feel the MMU's drive gears grab the filament

Select "Load to Nozzle"

Select the material type

Typically PLA or PETG

Wait for the machine to finish preheating

Select the corresponding filament number you wish to load

The machine will then load the filament to the nozzle