Prusa Research i3 MK3S+

unverified library/marlin/prusa-mk3s.hal.yaml

Id	prusa-mk3s
Manufacturer	Prusa Research
Model	i3 MK3S+
Driver	marlin
Hazard	high
Limits	unconfirmed The library file holds suggested limits for extruder_target, bed_target, fan_speed, home (action), pause (action), resume (action), cancel (action), and no person has confirmed those limits yet. How a person confirms the limits

Control channels
Channel	Max	Step	Rate per s	Unit	Confirm	Limit
extruder_target	215	1	10	degC	confirm	suggested
bed_target	60	1	5	degC	confirm	suggested
fan_speed	100	1		%	none	suggested

Actions
Action	Arguments	Confirm	Limit
home	axes x, y, z, xy, all	confirm	suggested
pause	none	none	suggested
resume	none	confirm	suggested
cancel	none	confirm	suggested

Read channels
Channel	Type	Unit	Every
extruder_temp	number	degC	2 s
bed_temp	number	degC	2 s
position_z	number	mm	on request
sd_printing	bool		5 s
sd_progress	number	%	5 s

openhal: "0.1"
device: { name: Original Prusa i3 MK3S+, model: i3 MK3S+, manufacturer: Prusa Research }
id: prusa-mk3s
match:
  usb: ["2c99:0002"]
  usb_class: cdc
connect: { marlin: auto, baud: 115200, timeout: 5 s, settle: 2 s, autoreport: 2 s }
read:
  extruder_temp: { unit: degC, every: 2 s, range: [0, 300] }
  bed_temp: { unit: degC, every: 2 s, range: [0, 130] }
  position_z: { unit: mm }
  sd_printing: { type: bool, every: 5 s }
  sd_progress: { unit: percent, every: 5 s }
write:
  extruder_target: { unit: degC, min: 0, max: 215, step: 1, max_change_per_s: 10, confirm: confirm, suggested: true }
  bed_target: { unit: degC, min: 0, max: 60, step: 1, max_change_per_s: 5, confirm: confirm, suggested: true }
  fan_speed: { unit: percent, min: 0, max: 100, step: 1, suggested: true }
actions:
  home:
    description: Home the axes with G28.
    args:
      axes: { type: enum, values: [x, y, z, xy, all] }
    require: ["sd_printing == false"]
    confirm: confirm
    suggested: true
  pause: { description: "Pause a print from the SD card (M25).", suggested: true }
  resume: { description: "Resume a paused SD card print (M24).", confirm: confirm, suggested: true }
  cancel: { description: "Abort the SD card print (M524).", confirm: confirm, suggested: true }
safe_state:
  - { extruder_target: 0, bed_target: 0, fan_speed: 0 }
interlocks:
  - if: "extruder_target > 0 degC"
    require: "extruder_temp < 280 degC"
    message: "The hotend reads above 280 degC. Check the thermistor before heating."
watchdog:
  heartbeat: 5 s
  on_loss: safe_state
hazard: high
notes: >-
  Suggested limits. A person must confirm every limit before this device can be written.
  The MK3S+ runs Prusa firmware, which grew out of Marlin and answers the same G-code over USB. The limits
  suit PLA, with the hotend at most 215 degC and the bed at most 60 degC. Raise them for other filaments
  only after a supervised print.
provenance: { source: library, by: OpenHAL starter library, at: 2026-10-25, verification: { status: unverified } }