On 8/12/2020 at 9:22 PM, tinkergnome said:no!, yes! 🙂
BTW: The absolute values do not count, the ratio between them is the key. Here is the shortest (but complete) explanation from the originator:
So in which case and as I understand it, I need 175 150 50 and it's absolutely fine that the sum of the parts do not add up to the total?
Presumably the 220-175 difference is so that there is some allocation for the steppers and main board?
On 8/12/2020 at 9:22 PM, tinkergnome said:I would like to be wrong, but articles that are useful in practice (for this specific task) are very rare...
Here is a nice write-up that may help (especially the "Troubleshooting" section):
https://forum.seemecnc.com/forum/viewtopic.php?f=36&t=11440&p=106976
I have also really struggled to find any decent information on this for the UM2 but you are correct about that article being very good. I have just followed through the process as described there with the cooling fans on full, nozzle almost touching the build plate and in the XY centre and with the bed set to 50 degrees. There was no material in the head however and I was only heating to 100 degrees (for speed.)
After about an hour of tinkering, I ended up at a set of PID values that were disappointingly close to the default values for the 30W heater!
My trial and error got me to P:13 I:0.4 D:50
and 35W default is P:12 I:0.75 D:55
and actually this looks slightly better!
The autotune suggested 23 1.2 55
I will start some prints and continue to fine tune for real world use and then update this thread for anyone else needing this.
I did some screen shots and copied the PID values on to some of them for reference.
Edited by rotorhead
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tinkergnome 929
Don't use this... Marlin auto-tune does not work - it never has 🤷♂️
I would like to be wrong, but articles that are useful in practice (for this specific task) are very rare...
Here is a nice write-up that may help (especially the "Troubleshooting" section):
https://forum.seemecnc.com/forum/viewtopic.php?f=36&t=11440&p=106976
no!, yes! 🙂
BTW: The absolute values do not count, the ratio between them is the key. Here is the shortest (but complete) explanation from the originator:
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