Upgrade kit available

[PeggyB]

do you mean Sunon fans?

[johan]

The hot end cooling fan is a Sunon 25x25x6mm fan type V1 which is more powerful and a bit more noisy than the type V2 model many tinkerers have installed as a replacement for the noisy middle fan. I think this type of fan has been installed on some later standard UM2s, not sure.

The model cooling are the same as the standard UM2 but the fan shroud design is changed to provide an optimized airflow.

[reibuehl]

That would be this one then?

http://www.sunon.com/tw/products/pdf/DCFAN/MC2506_U.pdf

[Blizz]

I thought we were talking about the side fans? (which are 30x30mm)

[reibuehl]

I thought we talk about all three fans

[Blizz]

So just upgraded the printer... Took longer than expected due to the incompatibility with UltiArjans' rail system that I had installed. Had to complete remove that as well. The fans definitely make less noise, especially the "hot end always on"-one.

I do seem to have an underextrusion problem now.
The walls are no longer touching and if you look at the infil... very nice bridging but that is not the intention... The e-steps got reset to 282 when I upgraded the firmware, but if memory serves that is also the original UM2 value, shouldn't it be different?

[Meduza]

Yes 282 sounds like the original steps/mm, it should be 369 if my memory serves me right...

Are you sure that you upgraded to the UM2+ firmware?

[Blizz]

Would really love to know the correct value...
I actually looked through the source code but that says 282 as well. Don't see any other branches etc referring to the UM2+

I'm using TinkerGnome at this point, a fork, but just like the original one it also specifies 282.

FYI, The end result:

[Meduza]

369 is the correct number according to:
https://github.com/Ultimaker/UM2.1-Firm ... guration.h

(JarJar was the codename for the UM2+ during development)

If you install the UM2+ build from Tinkergnome you should get the correct value, you only need to change it if you are using the wrong release or compiling from source yourself. https://github.com/TinkerGnome/Ultimake ... n/releases

[Blizz]

I actually have that release... The UM2+ variant.

But I had a custom E value before and think I manually restored it to 282. So perhaps it just used the value stored in the printer itself because there was one. Let me up it to 369 and try again. Thanks!

[Blizz]

@Meduza: You sir, are awesome

That appeared to be the issue indeed. So 369 is the value to use. I guess it defaults to what is mentioned in the `Configure.h` if you don't have a value stored for it in the eeprom (or however the firmware saves its settings).

It looks a lot better now:

[Meduza]

The thing is that the value from configuration.h is overwritten when compiling by the build script that @tinkergnome uses, so the UM2+ release does not have that value. You probably had it set manually and stored in EEPROM, wich took precedence over the value from the firmware.

And yes, that looks a lot better than your earlier picture

[johan]

When upgrading the firmware the default value for all setting (incl E-steps) is only set to the firmware default if the EEPROM_VERSION defined has changed from the previous firmware. The only time it is really necessary from a software point of view to change EEPROM_VERSION is when the data layout in EEPROM has changed.

[Blizz]

So basically everyone with an UM2 who ever tinkered with the e-steps value is going to experience the same problem as I did when they upgrade to the UM2+
Best to make sure to mention every possible keyword here so that they find this thread when they look for a solution

So people: If you are experiencing underextrusion after your upgrade with the UM2+ kit, meaning printed lines not touching etc. Make sure to check the e-steps value. It should be 369 for the new feeder. The original for the UM2 is 282, but that is too low. Please note that if you use TinkerGnome's firmware variant, you can actually configure the step values via the LCD on the printer. No need to write G-Code or use pronterface or octoprint or any other interface to do so.

[LePaul]

I'm curious how many, asides Blizz, have done the upgrade?