Fwiffo's Voron Klipper Config

This repository contains the configuration options for Klipper, Mainsail/Fluidd, Moonraker, etc. for my Voron printers (currently two V0.1 with a V2.4 coming in the future.)

Along with printer-specific configs, there are a number of macros, etc. that others might find useful.

Fancy PRINT_START and PRINT_END macros

The PRINT_START macro simplifies the slicer configuration in addition to adding a lot of automation and functionality.

Heat soak

When I previously wanted to do a heat-soak to warm up the chamber before printing ABS, I would set the temperature, but would then forget to go back and start the actual print. I added some macros to manage heat soaks automatically.

You can run SET_HEAT_SOAK TIME=[time in seconds] TEMP=[temperature] to request a heat soak at the start of the next print. The soak time and/or temperature will be shown on the printer display. I recommend putting options for this in the temperature pre-set menu in Mainsail/Fluidd (e.g. 35° heat soak).

The next time you start a print, after the bed has warmed up, the print will wait the specified time or until the specified chamber temperature is reached (or both).

Improved heater behavior

Generally, the hotend warms up much faster than the heated bed, so if you start heating them at the same time, the filament sits there cooking needlessly. This can actually cause problems with some filaments, and also wastes energy.

The PRINT_START macro waits until the bed is nearly up to temperature (and until after any heat soak has been completed) before turning on the hotend heater. Both the bed and hotend will get up to temperature at about the same time.

Improved homing behavior

To avoid wasting time, the start macro only homes the printhead at the start of print if it's not already homed. It then centers the printhead over the bed to making heating as even as possible. Immediately before starting the print, it then homes again to account for any movement/expansion during heating.

The second homing can be disabled with the SKIP_HOME parameter to PRINT_START in case you're printing with multiple filaments in succession. This reduces the chance of misalignment. There is also a STAY_HOT option for PRINT_END to keep the heaters on.

Per-print or per-filament settings management

If you set custom speed limits or pressure advance for a specific filament or print using SET_VELOCITY_LIMIT or SET_PRESSURE_ADVANCE the defaults from your config will be restored at the end of print, or if the print is cancelled.

Automatic Nevermore management

If you pass the filament type to the PRINT_START macro, it will automatically set the fan speed for the Nevermore air filter (if present). You can also set the speed in your filament custom gcode (e.g. NEVERMORE SPEED=0.5). The Nevermore turns off automatically 5 minutes after printing has completed.

Slicer Start G-code

; Stop PrusaSlicer and SuperSlicer from injecting separate
; temperature gcodes.
M104 S0
M140 S0

PRINT_START TEMP=[first_layer_temperature] BED_TEMP=[first_layer_bed_temperature] FILAMENT={filament_type[0]}

; Fiddle with these options if there are quality issues.
; SET_VELOCITY_LIMIT VELOCITY=200
; SET_VELOCITY_LIMIT ACCEL=8000
; SET_VELOCITY_LIMIT SQUARE_CORNER_VELOCITY=5

Slicer End G-code

PRINT_END

Filament Start G-code

; Pressure advance (needs to be tuned per filament)
; SET_PRESSURE_ADVANCE ADVANCE=0.020

; Uncomment to override the filament-type default
; NEVERMORE SPEED=0.8

Other functionality

• Lots of status/LED updates during startup/printing/pause/resume/end/cancel
• Jerks printhead at end of print to remove string
• Parks the head in a useful place automatically based on printer geometry

Fancy functionality for V0 display

• Nevermore fan speed, if present - alternates with part cooling fan speed
• Chamber temperature if a chamber sensor is present - alternates with bed temperature
• Filename during printing (with scrolling) - alternates with M117 status
• Time remaining during printing, if available from M73, otherwise estimates based on print progress
• Elapsed time at end of print
• Time requested for heat soak (or remaining time) if a heat soak is requested or in progress
• Screensaver!

Acceleration limits

The max_accel configuration option and SET_VELOCITY_LIMITS ACCEL=... commands in Klipper don't actually set a maximum or limit to acceleration; they just set a default. Acceleration values produced by your slicer (M204) simply override them.

This is inconsistent with other limits set in Klipper firmware (velocity, build volume, temperature, etc.) and contrary to their naming and the Klipper documentation. Generally, firmware limits are provided to protect the printer in the event of an inadvertant slicer misconfiguration, but since the acceleration settings are ignored, they serve no purpose.

This is apparently intended behavior (20210430).

To make things work as expected, I've overriden M204 to respect these limits.

Misc. quality-of-life macros

• Macro to conditionally home the printer only if it's not already homed
• Useful automatic parking macro and improved homing behavior
• Smart printhead-centering macro
• Macro to set fan speed only if it exists to make it easier to share macros across multiple printers
• Mini-afterburner appropriate filament load/unload macros

PARK_USEFULLY [SPEED=6000]
HOME_IF_NOT_HOMED [SPEED=6000]
CENTER_PRINTHEAD
SET_FAN_SPEED_IF_EXISTS FAN=fan_name SPEED=0.5
LOAD_FILAMENT
UNLOAD_FILAMENT

Other things

• Reasonable starting points for lots of V0 settings
• A corrected thermistor configuration for Keenovo bed heaters
• Configuration for adxl345 accelerometer for input shaper
• Configuration for Klipper expander, Nevermore air filter, and BME280-family environmental sensors