E3d v6 thermistor settings …

dotorg

Curious what people are using for it…

The e3d troubleshooting page says to use 4267 on RepRapFirmware. ( https://wiki.e3d-online.com/wiki/E3D-v6_Troubleshooting )

The e3d V6 installation page says to use 4388 or 4725 ( https://wiki.e3d-online.com/wiki/E3D-v6_Assembly#RepRapFirmware )

The Duet wiki says 4725 ( https://duet3d.com/wiki/Connecting_thermistors )

A bunch of threads people seem to be using 4388, which is an example on the above page, but not the one called out for the e3d v6.

The RepRapFirmware configurator says 4388 in its text, but if you actually select it and apply it, it puts 4725.

So everything is all over the place.

Given even the manufacturer is giving three different values, I'm not sure what to go with… (I'm dealing with problems with blobs and oozing in a Chimera setup, and I'm trying to make sure incorrect hotend temps aren't contributing, but my IR thermometer isn't accurate enough to definitively hit one or the other to verify them...)

dc42

The E3D troubleshooting page is wrong. The wiki and the E3D installation page are correct. 4388 was a good choice before RRF supported the C parameter, but now 4725 with the correct C parameter is better.

dotorg

Good to know, that's what I've got.

Which means its not related to my globbing

Edkirk

I also have the E3D V6, I have only been working with the Duet Wifi for about a week now, very please with it. I just did some experiments with the B setting, I have a Fluke 54II K thermometer with their surface probe which I have been using for many years to trouble shoot refrigeration equipment, it is very accurate. I found with the setting of B4725 the hot end overshot about 30C. I changed the C0 to C7.06e-8 and now the temperature is right on. Fortunately I read the WIKI and found the graph with the settings.

Thanks, Ed

dc42

B4725 with C0 would indeed give the wrong readings. With C0 you should use B4388, which is what we recommended before RRF supported the C parameter.

designedby36

So my config lists

M305 P1 T100000 B4725 C0 R4700

so is that correct based on a genuine V6?

Sorry new to firmware and don't understand the C parameter.

designedby36

Just noticed the settings on my other machine are

M305 P1 T100000 B4725 C7.060000e-8 R4700

With the same setup.

peter247

I`m using M305 P1 B4725 C7.060000e-8 from e3d's docs is that wrong ?

dc42

@peter247 said in E3d v6 thermistor settings …:

I`m using M305 P1 B4725 C7.060000e-8 from e3d's docs is that wrong ?

That is correct.

whosrdaddy

@dc42 Ok, now I am confused.

I am using this setting atm: M305 P1 T100000 B4725 R4700

If I change this to: M305 P1 T100000 R47000 B4725 C7.060000e-8, I have a temperature difference of 40°C (!!) at 220°C

dc42

@whosrdaddy said in E3d v6 thermistor settings …:

@dc42 Ok, now I am confused.

I am using this setting atm: M305 P1 T100000 B4725 R4700

If I change this to: M305 P1 T100000 R47000 B4725 C7.060000e-8, I have a temperature difference of 40°C (!!) at 220°C

I am not at all surprised, because B4725 with C0 is completely wrong for that thermistor.