Forced Convection fans for Voron Trident
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Heat up your camber more by pointing fans at the bed.
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- Printables
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- Voron Parts & Upgrades
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- Creative Commons — Public Domain
Attention, do not play with heaters. Make sure you have all safety features activated and you have a working thermal runaway protection as well as a physical overtemperature switch. Use at your own risk.
You need (BOM)
- 2x 60x25 or 60x20mm fans. Mine are 24V and start up at 4V, which is what you want.
- 8x M3 thread inserts
- 8x M3x8 countersunk screws
- 2x M3x10 socket head cap screws
- 2x M3 T-Nut
By pointing some very low rpm fans at your heated bed you can heat up your chamber to improve ABS printing. I recommend to keep the RPM low as this is a slow heat process and the bed temperature should still be stable.
In klipper, you can add the fan as a closed loop heater to automatically speed control them. if you do this make sure the PID is tuned very bad as this could lead to the two systems oscillating. I also recommend to check what happens if the door is open by accident or the fans are somehow stuck at 100% PWM even they are limited in klipper.
[heater_generic chamber]
heater_pin: PD14 # Replace with the fan’s control pin
sensor_type: Generic 3950
sensor_pin: PF5 # This links to the chamber thermistor
control: pid
pid_Kp: 6 # 36.345 (original tuned)
pid_Ki: 0.15 # 0.456 (original tuned)
pid_Kd: 0.0 # 723.715 (original tuned)
min_temp: 0
max_temp: 80
max_power: 0.2 #keep this low but your fans need to be able to spin.
pwm_cycle_time: 0.005[verify_heater chamber] # this is needed so klipper does not error out. Do NOT do this on actual real heating elements.
max_error: 120
check_gain_time: 120
hysteresis: 50
heating_gain: 1