Building the C-Bot 3D printer: Part 23 : Filament Cooling Fans
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(Note: Since I posted this, I upgraded the fans to more powerful models. See that here.)
Total time: About 2 hours.
Based on previously printed calibration cubes, I knew I couldn’t do any serious printing until I got my filament coolers installed: I printed out the pair of them, bolted some 12v 40mm fans to them, ran the wires, and quickly realized I didn’t know how to tell Marlin & the Rumba board they existed.
Long story short, this is how I wired all the fans on the board:
- The extruder cooler fan is plugged into the Rumba’s ‘Extruder2’ / pin 6 (I hijacked it, since I don’t have multiple extruders).
- The filament cooler fans (one on each side of the hot-end, that this post is about) are plugged into the Rumba’s ‘Fan0’ / pin 7.
- The two case fans (that cool the stepper drivers) are plugged into the Rumba’s ‘Fan1’ / pin 8.
Then in Marlin:
Configuration_adv.h : #define CONTROLLERFAN_PIN 8 // Rumba Fan1: Case stepper driver cooling fan #define EXTRUDER_0_AUTO_FAN_PIN 6 // Rumba Extruder2 : Extruder cooling fan pins_RUMBA.h: #define FAN_PIN 7 // Rumba Fan0 : Filament cooling fan
Once that was uploaded, the filament coolers got to work immediately:
My only concern is they don’t feel like they have enough ‘oomph’: They’re 12v, .1A, if I buy any more in the future I think I’ll look for something with a higher CFM rating. But for the time being, they work! And as you see, some real printing is starting to happen…
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