Attach/define such a fan to one of the connectors FAN0, FAN1, or FAN2. Many slicer programs will introduce fan control G-codes to run the fan strongly for layers that print quickly, and only start running the fan after the first few layers.
That said, excessive cooling can cause problems with first layer adhesion or even interfere with a new layer's bonding to the previous one. Printing PLA (and perhaps other plastics) benefits from additional cooling of printed layers, particularly when layers are printing quickly. We recommend you use the FAN1 connector for a thermostatically-controlled hot end fan, because on the Duet 2 WiFi / Ethernet in RRF 2.x it defaults to being on at power up, to provide maximum safety if you restart your Duet when the hot end is hot.Ī thermostatically controlled hot end fan will be turned on automatically when you auto tune any heater that it monitors. This sets fan 1 to run any time the temperature of heater 1 is above 45 Celsius. Plug your fan into one of the PWM fan pins, and configure it as a thermostatic fan for the appropriate heater by putting the appropriate M106 G-code in config.g. Duet boards support this mode of operation. This fan should be on any time the hot end is hot enough to melt plastic, but can safely be off when the hot end is cool even if the rest of the machine is on. However, a current 'blip' that goes over this limit for a few seconds while the fan starts up should not harm them.Īs mentioned above, many hot ends require a fan to keep the heatsink cool, so that the filament remains solid until it passes through the heat break into the melt zone. See table above for our recommendations on continuous current draw.Each controlled fan can be configured in firmware as a gcode controlled fan or as a thermostatically-controlled fan.Mixed-voltage setups are not directly supported, but the Duet switches the fans' connections to ground, so you may be able to connect each fan's positive side to the appropriate voltage and its negative side to the appropriate pin on the Duet.
Intel 4 pin fan pinout software#
This gets around the issue of Slicer software not supporting multiple part cooling fans. If you have a multi-tool setup, you can define the print cooling fan of each tool as part of the tool.This is the easiest configuration to use because it's what most G-code slicing software (and the firmware, in RRF 2.x and earlier) expects by default. Our intention is that in a 3D printer with a single print head, you define/use Fan0 for the print cooling fan and Fan1 for the heatsink fan.(Versions before 0.8 had 5 fan connections see the Duex hardware page for details) For Duet 2 WiFi and Ethernet, the Duex 2 and Duex 5 have 6 further PWM controllable fans (FAN3 - FAN8).You can supply a different voltage to the centre pin of the 3-pin jumper, pin V_FAN_A or V_FAN_B, to run fans at different voltages.
V FAN A controls FAN0, FAN1 and the always-on fan pins, V_FAN_B controls FAN2.
Intel 4 pin fan pinout plus#