V3b Not heating all the way up.

[thosey]

I received a new V3b extruder Friday. It is the 19 vdc version. I have installed it and increased heats in Slic3r to 215 deg. I have tried running from Repetier Host and straight from SD card with the same results. The extruder heats up to 202 to 209 degrees and holds. I have changed the settings and it seems that it heats just shy of goal. I have moved the thermistor inside the housing and it will increase heat enough to start printing; but, it goes right back into the holding temp from 201 to 209 deg. I have never had this problem heating to 185 with the V3 extruder.
Thoughts?

Tim

[jsc]

Are you sure it is a 19V v3b? Is there even such an animal? Maybe you need to change your firmware: http://makergear.wikidot.com/m2-firmware

In particular, see if the http://makergear.wdfiles.com/local--fil ... 24v40W.zip version is appropriate for you.

[Tim]

Have you run a PID test? Often what happens is that the extruder heats up much faster than the original, and the overshoot is high, causing the firmware to clamp the temperature. I'm just guessing here, though. I changed to an E3Dv6 extruder, which is very similar to a V3b running at 19V, but I didn't start printing with it until I had first calibrated the PID values in firmware, and I haven't had any similar problem. My extruder had a different thermistor, which also required a firmware change, but I think that MakerGear uses the same kind of thermistor in both hot-ends, so unless I'm wrong about that, only the PID settings should need to be adjusted.

[Tim]

Yes, Jin, there is such a beast. . . for those of us with the old split-supply M2s, the V3b can be purchased with a 19V heater cartridge instead of the 24V one, which is a way of updating without the cost of the 24V upgrade, which is actually pretty pricey.

[jimc]

tim, when i changed to my v3b it came with a 12v heater and not a 19 or 24v. thats why when the heat came on it shot up like a rocket. 12v and 24v is common. i didnt realize there was a 19 as well. i remember i did change my firmware and also did a pid auto tune. here is some more info on the auto tune sequence.

http://blog.lincomatic.com/?p=773

[thosey]

Jin, yes dual power supply unit of 12 vdc for heater bed and 19 vdc for extruder, stepper and logic.
Tim, I was thinking firmware based problem and was wondering if there was something that was clamping it. I will look at Jim's link on setting the pid loop.
Jim, thanks for the link. I will take a look. Yes, the extruder is 19 vdc. I checked the email were I asked Karen if I was receiving the 12 vdc version and she corrected me that it was a 19 vdc version. It appears that MakerGear uses a blue zip tie with 19 on it to denote this version of heater.
I will get back if setting the pid solves the problem.

[jimc]

ahhh ok well its good that you are sure what you got. in that case yes you need to do the auto tune sequence. if that doesnt do it then in the firmware there is a setting for MAX PID. this is the max current being able to goto the heater. that should be a range from 0-510. the firmware values usually go from 0-255 but this # seems to be double the value. default on my firmware was 400 which gave me an actual current setting of 200. with a 19 volt heater you probably need to increase this max pid value. see if the autotune works for you first.

[thosey]

Just found this on the M2 wiki page. http://makergear.wikidot.com/m2-firmware

While not an official revision, one may end up with a 24V/40W V3B hotend, on a 19V M2. This configuration requires a PID setting of P48.89 I3.41 D175.43, and a PID_MAX setting of 400. Firmware with this configuration, and x16 microstepping, is M2Marlinx1619Vwith24v40W.zip.

Seems like I have what I need now. Will report back on success or failure.

Tim

[jsc]

That's the one I linked!

[thosey]

Up and running. Yep, the one you linked jsc. Needed to take time to read it and had a bit of information overload.
Thank you.