Chamber Heater Mounting Bracket- Angled

Safety First! 

110V PTC heaters have live mains voltage on the heating coil. Only for use by those knowledgeable and comfortable with mains wiring. HIGHLY Recommend a thermal fuse as the minimum safety precaution.

Chamber heaters are all the rage now!

After success with a DIY enclosure and a simple solution to mount a PTC heater to my Ender 5, I quickly worked up to the wonderful ZeroG Mercury 1.1 mod including the 275mm bed and Hyrda Z motion system. This mounting bracket was further developed to fit both Ender 5 Pro Stock Z and the aforementioned ZeroG mod. Full clearance for Z travel in both cases. Over 150 hours of testing with the majority printing ABS and ASA. My pictured part (with all those hours of use) is of a previous design, the uploaded files have the heater 3mm moved away from the printed legs to ensure clearance between the printed part and the housing of the heater. (I trimmed the prototype and didn't feel like printing it again)

This bracket allows the mounting of 60mm fan PTC heaters. I mounted this low in the chamber for easy wiring and to ensure the build volume was somewhat uniformly heated-- You can slide this up or down a 2020 or 2040 extrusion to fit your needs.

The 250 watt heater from Amazon really runs at 650 watts peak and about 350 watts stable. The chamber of my M1.1 with a “top hat” and rear shelf controls at 50C with no issues for hours on end- much of that with the heater off after initial heating. The bracket mounts with the fan flowing toward the center of the build volume to help circualtion. The heater housing screws with M3 hardware to Voron size (M3 x 4mm thick) heat set inserts. Use your favorite extrusion hardware to fasten the bracket to your frame.

Fusion 360 model is uploaded. Functional, but messy. Feel free to remix.

Print Settings/Materials:

ABS/ASA and other high temperature materials are suitable.

PLA / PETG NOT recommended. It may work for testing, but will warp at higher chamber temps.

I used 4 walls, 4 top/bottom, 45% infill, .2 layer height, .4 line width on the final version --ensure your overhangs and cooling are on-point. (Cut the model in your slicer to test as the legs are overhangs and quick layer times)

Print with the flat face down (imported orientation is not useful). No supports needed.

BOM:

(2) M3 x 4mm depth “Voron” style heat set inserts

(4) M3x10mm DIN 921 screws ( 2xBracket to 2020, 2x Heater Housing to Bracket)

(2) M3 printed hammer nuts (Or equivalent) 

(2) M3 Nuts (Only needed for printed 2020 hardware)

(1) PTC Heater of choice with 60 mm fan ( https://www.amazon.com/dp/B07NYX5DKD?psc=1&ref=ppx_yo2ov_dt_b_product_details ) For reference

(1) Chamber Thermostat (70C) wired in the mains circuit to protect in the event of SSR failed closed https://www.digikey.com/en/products/detail/cantherm/B12A07005AEDA0GE/1840624

(1) 24VDC control - 120 VAC 10A Load SSR https://www.fabreeko.com/products/omron-g3nb-210b-1-solid-state-relay-ssr?_pos=1&_sid=e3c259291&_ss=r

(1) Chamber Thermistor - 3mm cartridge style 104-GT2 in the Fabreeko M1.1 Kit

(1) Chamber Thermistor Mount - Wonderfully simple and effective for 3x15mm cartidge thermistors https://www.printables.com/model/410596-voron-chamber-thermistor-mount-2020-extrusion

Config: Using Kalcio (Danger Klipper)

[heater_generic chamber]
gcode_id: chamber
heater_pin: PA3 #HE1 #BTT Octopus Pro V1.1 Pin- Adjust as needed
sensor_type: ATC Semitec 104GT-2 #From Fabreeko Kit
sensor_pin: PF5 #T1 #BTT Octopus Pro V1.1 Pin- Adjust as needed
min_temp: 10
max_temp: 80
Max_power: 1.0
control: pid
pid_Kp=63.418 #Borrowed from Qidi Q1 settings
pid_Ki=1.342  #Borrowed from Qidi Q1 settings
pid_Kd=749.125 #Borrowed from Qidi Q1 settings
pwm_cycle_time: 0.016 #for 60Hz Power to avoid pulsing lights

[verify_heater chamber] #Borrowed from Qidi Q1 settings
max_error: 150
check_gain_time: 480
#hysteresis: 5
heating_gain: 0.5

[heater_fan Chamber_Fan]
pin: PD12 #Port:Fan2 12VDC #BTT Octopus Pro V1.1 Pin- Adjust as needed
Heater: chamber
Heater_temp: 26.0
shutdown_speed: 1.0

#[heater_fan SSR_Fan] #Best to cool the SSR if you can.
#pin: PD15 #Port:Fan5 24VDC
#Heater: heater_bed, chamber
#fan_speed: 0.75
#shutdown_speed: 1.0

[gcode_macro M141] #pulled from OrcaSlicer guidance 
gcode:
   SET_HEATER_TEMPERATURE HEATER=chamber TARGET={params.S|default(0)}

[gcode_macro M191] #pulled from OrcaSlicer guidance 
gcode:
   {% set s = params.S|float %}
   {% if s == 0 %}
       # If target temperature is 0, do nothing
       M117 Chamber heating cancelled
   {% else %}
       SET_HEATER_TEMPERATURE HEATER=chamber TARGET={s}
       # Orca: uncomment the following line if you want to use heat bed to assist chamber heating
        M140 S110
       #TEMPERATURE_WAIT SENSOR="chamber" MINIMUM={s-1} MAXIMUM={s+1}
       #M117 Chamber at target temperature
   {% endif %}