Flow in Skeinforge is an older concept, maybe... you can adjust the amount of plastic requested to be extruded by Cura by altering the packing density - which is really just increasing or decreasing the effective diameter of the filament. In general though, you should leave that at 1 for PLA. In the newer firmware, the flow rate setting is a percentage where >100 means extrude that much more plastic than the nominal amount requested in the gcode.
Yes, if the gcode file doesn't explicitly set a steps-per-e it will use whatever is saved in the EEPROM of your machine (which you can view and change with the UltiController and then re-save). That said, a difference of 860 v 830 isn't that much in percentage terms. It would be better to have it right, but unless you're printing really, really fast, it's unlikely to cause blockages etc.
Di you have minimum layer time turned on in Cura; that will cause bits like the horns to slow down... but has the opposite effect to what is wanted on very small parts, because the head just sits over them - you can counter that by setting a minimum feedrate in the expert settings to keep the head moving in cases like that.
You've probably seen this thread about the bugs in the PID values...
They are now fixed, and Daid has merged them into the UM Marlin source, but I think the builder tool is using a slightly older version of the source code, from Daid's personal fork. You could build from the my latest version, mentioned on that link above, if you want. On the other hand, while you're still troubleshooting it might be best to go with the 'known to be reasonably good' firmware from the latest Cura.
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vincentp 0
very good tips thank you both of you.
firmware : great minds etc. I decided to build my own custom firmware from that website that has all the options online (webpage). Does it have the latest firmware / source code ?
that new firmware fixed the E step thing in the controller, however, I still have weird valures for the temp PID (D and C IIRC).
I did my update before reading your message, so the UM is currently printing. I'm going the latest version of cura though.
My thoughts about pressure and over extrusion, ATM : I had 868 (ish) in cura after calibrating with the old scrip of cura (v10 ?). But then I moved to the new extruder drive, found discussion about the new OD of the knurled screw and read that illuminarti was using 833.
But then my UM was still set to 868 (in the firmware). I don't know if it has some impact but I think that if the Gcode does not export the E step value in the code itself, the UM is using its system value, isn't it ?
that could be the source of my issue. I'll keep you posted and thanks again.
I'm also going to re assemble the hot end with your advice I totally forgot abou the tightening of that area. Things will change with the hot end V2 but I can at least keep experimenting with this first.
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