This article describes the menu system BEFORE firmware 3.9.0 for the Original Prusa i3 MK3S.

Controlling the LCD screen is done by a single control element: a rotational knob that you press to confirm the selection. By single pressing the control button on the information screen, you enter the main menu.

The reset button is placed directly under the control knob. Pressing the reset button equates to quickly toggling the power switch (hard reset). It is useful when the printer exhibits weird behavior or you see a failed print that requires immediate cancellation.

Shortcut: Quick access to Move Z-axis function - While on the Info-screen, press and hold the Control knob for 3 seconds

Main screen

Nozzle temperature (actual / desired temperature)
Heatbed temperature (actual / desired temperature)
Progress of printing in % - shown only during the printing
Status bar (Prusa i3 MK3S ready. / Heating / file_name.gcode, etc.)
Z-axis position
Printing speed
Remaining time estimation

Shortcut: Quick access to change Printing speed - While on the Info-screen, spin the knob either direction, more than one rotation, and see the percentage change.

Hierarchy of the LCD-menu

- Info screen (Main info-screen)

- Live adjust Z (during the printing process only)

- Tune (during the printing process only)

Speed
Nozzle
Bed
Fan speed
Flow
Change filament
Mode

- Pause print (during the printing process only)

- Stop print (during the printing process only)

- Preheat

PLA - 215/60
PET - 230/85
ABS - 255/100
ASA - 260/105
HIPS - 220/100
PP - 254/100
FLEX - 230/50
Cooldown

- Print from SD

- Filament autoload (Load filament if Filament autoload is off)

- Unload filament

- Settings

Temperature
- Nozzle
- Bed
- Fan speed
Move axis
- Move X
- Move Y
- Move Z
- Extruder
- Disable steppers
Filament sensor - On / Off
F. autoload - On / Off / N/A
Fans check - On / Off
Mode - Normal / Stealth
Crash detection - On / Off
HW setup
- Steel sheets
- Nozzle d. - 0.25 / 0.40 / 0.60
- Checks
  - Nozzle - warn / strict / none
  - Model - warn / strict / none
  - Firmware - warn / strict / none
Mesh bed leveling
- Mesh 3x3 / 7x7
- Z-probe nr. 1 / 3 / 5
- Magnets comp. - On / Off
Lin. correction
Temperature calibration - On / Off
RPi port - On / Off
Live adjust Z
Select language
SD card - Normal / FlashAir
Sort - Time / Alphabet / None
Sound - Loud / Once / Silent / Assist

- Calibration

Wizard
First layer calibration
Auto home
Selftest
Calibrate XYZ
Calibrate Z
Mesh Bed Leveling
Bed level correction
PID Calibration
Reset XYZ calibration
Temperature Calibration

- Statistics

- Fail stats

Last print
Total

- Support

Firmware version
XYZ calibration detail
Extruder info
Sensor info
Belt status
Temperatures
Voltages

Original Prusa i3 MK2.5S

Printer description

Mini RAMBo electronics wiring (MK2S, MK2.5, MK2.5S)

LCD menu i3 (pre firmware 3.9.0)