I have been quite happy running my duet wifi on my homebuild kossel mini for a few months now (just casually running it during weekends here and there, so no pro by all means)
I am perhaps running a few fw versions behind at:
Firmware Name: RepRapFirmware for Duet WiFi
Firmware Electronics: Duet WiFi 1.0
Firmware Version: 1.20beta8+1 (2017-11-18)
WiFi Server Version: 1.20b9
Web Interface Version: 1.19.3
Generally I am very happy with dimentional accuracy of my print for practical stuff, but I have been having start/end blob issues to my moves and I have started to experiment with pressure advance settings as I would like to print a few more aestetic figures and not just my current mounting brackets and hooks
However, I am not having much luck with my current troubleshooting, so I thought I would post my settings here for you to critique if anyone have the time to look through.
Some background, .. Firstly, my printer is a mini kossel with a capricorn bowden. I have a e3d v6 hotend and a duetwifi + smarteffector setup (calibrating to 0.007 which I am quite happy ). I am on 24V.
From config (sorry about my obvious comments, but I am quite new to this..)
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X100 Y100 Z100 E815 ; Set steps per mm (Extruder steps mm) 837 corrected from wiki > 815 (5.02.2018)
;For 256microstepp from 100 -> 1600
M566 X1200 Y1200 Z1200 E1200 ; Set maximum instantaneous speed changes (mm/min)
M203 X18000 Y18000 Z18000 E1200 ; Set maximum speeds (mm/min)
M201 X1000 Y1000 Z1000 E1000 ; Set accelerations (mm/s^2)
M906 X1300 Y1300 Z1300 E900 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
I am uploading a couple of pictures for reference.
The blobs come at both start and end of move. For the benchy they are at the same spots for the different settings I have tried for the pressure advance:
M572 D0 S0.05 and up, but when I go over 0.2 my extruder seems to start grinding away at my filament. I did not try lower.
I used S3D and have following settings:
Clearly the devil is in the relationship between my retraction, speed and jerk, however... after a good while of blind guessing and reading through posts, I am still not getting it right. Simply I am not "getting" it
I am sure some of you could instantly spot my err and I would be very grateful to any pointers to further try out.
On a more positive sidenote:
I had a small session about 3d printing and coding to 50 young boys in a school here in Dublin today. It is very cool to see them inspired by this technology and the kossel makes for a very interesting object to watch as it makes wonderful movements. Next month I will be showing the minikossel on a stand at Dublin Maker 2018, so if anyone is in town, do hook up for a light chat and a Guinness
Here is a picture of it in action, but only showing without the kids So much fun.
Pps: New forum looks/works great!