I’ve been looking at the MPCNC guide for how to wire it, but I’m a bit confused as my cables are different colours.
Could someone give me a bit of guidance? I appear to have a connector for the fan, two red and two white cables coming from the hot end (the white ones have a connector on them), and the servo cables.
It also came with two drive gears - a 26 teeth and a 40 teeth. Which is the correct one to use?
The two small white wires are the hotend thermistor, the go to port T0 (where the resistor used to plug into).Polarity does not matter.
The two red wires go into the port D10, polarity does not matter.
The red and black are the heatsink fan and should be on at all times, usually we wire this to the power directly. Polarity does matter here red is positive. Not to be confused with a print fan that would wire into D9.
If you are using the old firmware you should be good to go, if you updated then you need to flash the extruder enabled one.
You will need to power both sides of the green plug as well.
You need a driver on the extruder axis but the rest looks okay. The wires on your green plug are a little frazzled fro me to be comfortable, you do not want to let the positive and negative touch, loosen up the screws, twist the ends and get them completely inside.
When you do put a driver on you will need to set the voltage first, before you try and move it.
You can start repetier/or check your lcd for the extruder temp, at room temp it should be 25C±5C and the heat sink fan should be on.
I’ve been poking it with a multimeter similar to this guide:
I’m getting 0.7v on all of the drivers. Is that correct? It seems very low. I’ve not touched these drivers since you sent them to me (and they’ve worked fine since I’ve had them).
My extruder heats up to 202 degrees and I can see a tiny (tiny) bit of plastic on the nozzle, but it’s not printing.
That guide is for different drivers but the technique is okay.
Yes I ship them on a full ramps kit at ~0.7V. Why does that seem low? The extruder driver might need to be lower depending on the stepper on it. as you run it check the temp of it after at least 30min, REally hot means turn down the driver, warm is perfect, cool means it might handle a little more but make sure to actively cool the driver if you go above 0.7V
Ah ok, I’m sure I read a guide saying it needed to be considerably higher.
I’m trying to print the test file you link to on the ramps page. It seems to heat up correctly to 202 degrees, but when it tries printing there’s nothing coming out (except for a few specs of plastic on the tip of the nozzle).
Is there an easy way to check that my extruder stepper is working correctly?
Hold the filament and see if it is getting pushed out instead of pulled in, meaning the extruder plug would need to get flipped, when powered down completely.
It is so easy to use the lcd library now I am not going to bother making one without it, so yes it will not flash without it. It used to be slightly more complicated. I have made a pictorial step by step here, https://www.v1engineering.com/marlin-firmware/
I’ve flashed the firmware and it seems I’m still getting no signal on that extruder slot, but I can confirm that the stepper driver is working (it works in the other slots).
Interestingly it seems that this new firmware has reversed my Y axis (although, it’s no problem!)
I guess I have issues with the driver for the extruder. I’ll try a different one and see if that helps.
Is there anything else I need to be aware of while debugging this?
Thanks a lot for all your help. I know I’m asking far too many questions!
