K3 Bed Fan Mount

Printers/K3/Rudis1261_Bed_Fan_Mount/Config/BedFans.cfg

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+# https://github.com/VoronDesign/VoronUsers/blob/master/printer_mods/Ellis/Bed_Fans/Klipper_Macros/bedfans.cfg
+############### Config options ##################
+
+[gcode_macro _BEDFANVARS]
+variable_threshold: 100		# If bed temp target is above this threshold, fans will be enabled. If temp is set to below this threshold, fans will be disabled.
+variable_minimum_chamber: 40 
+variable_fast: 1.0		# Fan speed once bed temp is reached  
+variable_slow: 0.2		# Fan speed while bed is heating
+gcode:
+
+########## Bed Fans #########
+
+[fan_generic BedFans]
+pin: PD15 # Change me
+#cycle_time: 0.05
+kick_start_time: 0.5
+
+########## Aliases #########
+
+[gcode_macro BEDFANSSLOW]
+gcode:
+	# Vars
+	{% set SLOW = printer["gcode_macro _BEDFANVARS"].slow|float %}
+
+	SET_FAN_SPEED FAN=BedFans SPEED={SLOW}
+
+[gcode_macro BEDFANSFAST]
+gcode:
+	# Vars
+	{% set FAST = printer["gcode_macro _BEDFANVARS"].fast|float %}
+
+	SET_FAN_SPEED FAN=BedFans SPEED={FAST}
+
+[gcode_macro BEDFANSOFF]
+gcode:
+	SET_FAN_SPEED FAN=BedFans SPEED=0
+
+############ Command overrides ############
+
+# Override, set fan speeds to low and start monitoring loop.
+[gcode_macro SET_HEATER_TEMPERATURE]
+rename_existing: _SET_HEATER_TEMPERATURE
+gcode:
+	# Parameters
+	{% set HEATER = params.HEATER|default("None") %}
+	{% set TARGET = params.TARGET|default(0)|int %}
+	# Vars
+	{% set THRESHOLD = printer["gcode_macro _BEDFANVARS"].threshold|int %}
+
+	{% if HEATER|lower == "extruder" %}
+		M104 S{TARGET}
+	{% elif HEATER|lower == "heater_bed" %}
+		M99140 S{TARGET}
+	{% else %}
+		{action_respond_info("Heater %s not supported" % HEATER)}
+	{% endif %}
+
+	# Set fans to low if heater_bed temp is requested above threshold temp, and kick off monitoring loop.
+	{% if HEATER|lower == "heater_bed" %}
+		{% if TARGET >= THRESHOLD %}
+			BEDFANSSLOW
+			UPDATE_DELAYED_GCODE ID=bedfanloop DURATION=1
+		{% else %}
+			BEDFANSOFF
+			UPDATE_DELAYED_GCODE ID=bedfanloop DURATION=0 #	Cancel bed fan loop if it's running
+		{% endif %}
+	{% endif %}
+
+# Override M190 (Wait for Bed Temperature)
+# As a bonus, use TEMPERATURE_WAIT so we don't have to wait for PID to level off.
+[gcode_macro M190]
+rename_existing: M99190
+gcode:
+	# Parameters
+	{% set S = params.S|int %}
+	# Vars
+	{% set THRESHOLD = printer["gcode_macro _BEDFANVARS"].threshold|int %}
+
+	{% if S >= THRESHOLD %}
+		BEDFANSSLOW																# >= Threshold temp: Low speed fans while heating 
+	{% else %}
+		BEDFANSOFF																# < Threshold temp: Turn bed fans off
+	{% endif %}                                        
+
+	M140 {% for p in params
+	  %}{'%s%s' % (p, params[p])}{%
+	  endfor %}																	# Set bed temp
+
+	{% if S != 0 %}
+		TEMPERATURE_WAIT SENSOR=heater_bed MINIMUM={S|int} MAXIMUM={S|int + 5}	# Wait for bed temp within 5 degrees
+	{% endif %}
+
+	# Post-heating fan speeds
+	{% if S >= THRESHOLD %}								    
+		BEDFANSFAST																# >= Threshold temp: Higher speed fans after heating finished
+	{% endif %}
+
+# Replace M140 (Set Bed Temperature) to just be an alias of SET_HEATER_TEMPERATURE (which has associated bed fan logic if enabled)
+[gcode_macro M140]
+rename_existing: M99140
+gcode:
+	# Parameters
+	{% set S = params.S|float %}
+
+	SET_HEATER_TEMPERATURE HEATER=heater_bed TARGET={S}
+
+# Replace TURN_OFF_HEATERS
+[gcode_macro TURN_OFF_HEATERS]
+rename_existing: _TURN_OFF_HEATERS
+gcode:
+	BEDFANSOFF
+	_TURN_OFF_HEATERS
+
+################ Monitoring loop #####################
+
+# Turns bed fans to "fast" speed once target bed temp is reached.
+[delayed_gcode bedfanloop]
+gcode:
+	# Vars
+	{% set THRESHOLD = printer["gcode_macro _BEDFANVARS"].threshold|int %}
+	{% set MINIMUM_CHAMBER = printer["gcode_macro _BEDFANVARS"].minimum_chamber|int(40) %}
+    {% set CURRENT_CHAMBER_TEMP = printer['temperature_sensor Chamber'].temperature|int(0) %}
+
+	{% if printer.heater_bed.target >= THRESHOLD %}			   			    # Continue only if target temp greater than threshold.
+      {% if CURRENT_CHAMBER_TEMP <= MINIMUM_CHAMBER %}                          # Only have the fans on, until the desired ambient is reached
+		{% if printer.heater_bed.temperature|int >= (printer.heater_bed.target|int - 1) %}
+			BEDFANSFAST															# If within 1 degree of target temp: Higher speed fans
+		{% else %}
+			UPDATE_DELAYED_GCODE ID=bedfanloop DURATION=5						# If temp not reached yet: loop again
+		{% endif %}
+      {% else %}
+        BEDFANSOFF
+      {% endif %}
+	{% endif %}

Printers/K3/Rudis1261_Bed_Fan_Mount/README.md

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+## K3 Bed Fan Mount
+
+I designed and added these a while back to help speed up heating my chamber. It draws hot air from the bed and blows it downwards. Creating a bit of circulation in the chamber. I do feel it has made a difference, but it's hard to quantify. This is totally one worth doing if you have the stuff laying around.
+
+![image](./Images/Top.png)![image](./Images/Bottom.png)
+
+### You need
+- 6 Heatset inserts 5mm X 4mm
+- 2 Drop in M5 nuts
+- 2 8mm M5 bots
+- 4 20mm M3 bolts
+- 2 40x20mm blower fans like from an old Creality
+
+### Print settings
+- 0.2mm layers, 30% infill, grid
+- Would suggest ASA
+
+### Config
+
+Using Ellis [BedFan script](https://github.com/VoronDesign/VoronUsers/blob/master/printer_mods/Ellis/Bed_Fans/Klipper_Macros/bedfans.cfg). I don't believe I changed much from the original.
+
+Just be sure to update the pin your bedfans would use, include the config and you should be sorted.
+
+[./Config/BedFans.cfg](./Config/BedFans.cfg)
+
+```
+# ./Config/BedFans.cfg:14
+pin: PD15
+```
+
+### More images
+
+![image](./Images/Image0.jpg)
+![image](./Images/Image1.jpg)
+![image](./Images/Image2.jpg)