custom built 3d printer

yuval

hi guys, im a student and im trying to complete a project that a couple of students started and never finished
its custom built 3d priner with 2 toolheads.
everything moves ok, i think they used the configarator
the whole thing is quite a mess and i would actually love some assistent.
first question
ive connected the layer fan to out 7
"M950 F2 C"out7" Q500
M106 P2 S1 H-1 "

its a normal 12v blower.
for some reason the fan heats up but doesnt spin

same with the heater fan
M950 F1 C"out4" Q500 ; create fan 1 on pin !out5 and set its frequency
M106 P1 S1 H1 T45

doesnt turn on at 45

but the other fan works great:
M950 F0 C"out6" Q500 ; create fan 0 on pin !out4 and set its frequency
M106 P0 S1 H1 T45

both extruder fans are same, so in dont understand why one would work and the other wouldnt

both heaters works fine and heats up aobve 45c

o_lampe

@yuval You have mapped both extruder fans to the same heater (H1) so they should both spin when heater 1 exceeds 45°.

The layer fan that doesn't spin but gets hot, might be damaged. Did you test it on an 'always on' fan port or directly from a 12V PSU?
If the fan is OK, check the wiring to 'out7'.

yuval

@o_lampe hi, i fixed the heaters, and the fan was connected reveres polarity

now, i have different problem after everything heats up perfectly

usually if i want to use tool head number 1 i just add t0 to the gcode, and then everything normally, same with t1

but in this reprap firmware, seems like in order to move 2nd print head i need to send u100
i mean, the second tool head is a whole new axis.
what slicer know how to deal with it?

Phaedrux

Is it an IDEX printer?

dc42

@yuval said in custom built 3d printer:

but in this reprap firmware, seems like in order to move 2nd print head i need to send u100
i mean, the second tool head is a whole new axis.

It sounds to me that you have an IDEX printer. If that's the case, then in the M563 tool definition command for tool 1 on config.g you need to tell it to map X axis commands to the U axis. See https://docs.duet3d.com/en/User_manual/Machine_configuration/Configuration_IDEX.

yuval

@Phaedrux yes