Anyone with ramps an dualextrusion here? Where do you connect the pins?

3D Printing
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1

Anyone with ramps an dualextrusion here?
Where do you connect the pins? Or do you have one of these shields for thr fan? I mean the printcoolingfan.

2

In configuration hhb need configure a pwm pin for this use and attach on it a simple tip120. Currently I’m out of house can’t help too much . How marlin u use?

3

@Mauro_Manco yes i use marlin. Maybe you can look it up when at home?

4

i have marlin setup in an EEB configuration (extruder0, extruder1, bed) for the 3 mosfets. and both my hotend fan and my layer fans are connected to 12v constantly.
since i either use the layer fan during the entire print, or not at all i have a small on/off switch soldered to the layer fan on my wire split board.

i’ve also added a sliding wall to my layer fan so i can constrict fan flow if i need it to be lower, but i can’t remember the last time i’ve used it. for the filaments i’ve used (pla, petg, abs, nylon, tpu, pc, etc…) it’s either on or off the whole print.

5

@Tom_Keidar yeah ok but id like gcode control over my fan

6

I have an expantion board for upto 5 extruders for RAMPS. Allows you to use EFB mode.

7

ok - yeah, everything was mixed in my head… have not looked at this for a long time.
looking at the schematics - it looks like d4, d5, d6 (where the “servo” pins are) are all hardware pwm pins, so you can use them and connect a mosfet.
to control them - looking at reprap’s gcode guide, it looks like you can assign any pin a value with M42, e.g: if you have the mosfet connected to pin 5 it’d be M42 P5 S[0-255]

8

sorry @VolksTrieb 'i’m there… ok if use RC version of marlin open pins_ramps.h and on
#elif ENABLED(IS_RAMPS_EEB) // Hotend, Hotend, Bed
#define HEATER_1_PIN RAMPS_D9_PIN
#define HEATER_BED_PIN RAMPS_D8_PIN

need add define of fan pin
#define FAN_PIN 4

that permit to use D4 output (in servo connector) pwm to pilot a transistor as tip120 or little (fan no want too much powers) as switch .

9

fast and rude schema.
missing/deleted image from Google+

10

@Mauro_Manco thx. Yeah have some lightweight mosfets here that wont use much switching energy. Thx for the help sir!