Then how does that explain that the small cube i showed above is printed fine?
It is printed at exactly the same settings and with the same filament as the pyramid.
When it prints the pyramid it looks like there is a short delay from print move starts til plastic is extruded, then suddenly a big pile of filament is extruded. Can this be caused due to too high temeprature? Also, extruding into free air at the given temperature seems to work fine..
Okei, not much time for testing, but managed to do one small test today. I wouldn't say i got any wiser on the issue but i have hope that it has nothing to do with my printer (hardware or firmware).
The black one you know (disregard that it has a misshapen bottom - i got impatient and ripped it off the hot bed..)
The white one is the one i printed today (remember, no retractions whatsoever):
The only thing i did was: Turn on printer. Heat the nozzle to 200 degrees. Remove the black ColorFabb filament(not even a "Atomic pull"). Install a 5 year old white makerbot leftover. Then just re-print the g-code file already uploaded to the printer.
… Now this strongly suggests that the issue lies with the filament. However, i did not considder ColorFabb to be a bad brand at all! Also it does not explain why the black cube printed fine.. It seems like the black filament prints fine as long as the print has a more or less constant filament flow. As soon as the filament flow pauses i get issues..
My next test will be to try again with the black filament on a cold machine like today. This way i can eleminate heatcreep in my hotend as the issue. I do not belive that is the issue however as i use a 40 mm powerfull fan instead of the stock 35 mm E3D fan. Additionally the cube was printed right AFTER the pyramid without the printer cooling down in between.
I am happy if it is just a filament issue, but i just cant belive it. Either way, I still have absolutely no theory of why the black cube and pyramid are so different (same filament after all)
Of course!
As the error could potentially be anywhere here are all the relevant tabs from S3D
Okay, I am sloly going crazy..
How can these two prints both be printed at the same settings!!!!?
When printing the cube everything looks absolutely normal.
When printing the bottom of the pyramid everything looks normal.
As soon as the small sections start all shit breaks loose.. I can see that it underextrudes when it begins on a tower, then suddenly the next tower overflows extremely and so on. I sometimes hear the extruder grinding (i have a very low tension on the QR arm of the bondtech - tightening the screw removes grinding but changes nothing on the print)
They where printed at 40 mm/s
200 degrees
0.2 mm layer height
No retraction
No pressure advance
100% colling fans (temeperature is staple +- 1 degree at max.)
S3D is set to relative extrusions, so is the config.g
Temperature seems to be correct-ish. 180 gives grinding when just extruding into the air. 190 -220 works. 230-240 works but clearly to liquid 250 starts to smell burned.
I have absolutely no idea where to look..
Here is my full config.g
[[language]]
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P1 ; Set firmware compatibility to look like RepRapFirmare
M665 R147.796 L335 B130 H223.915 X-0.202 Y-0.102 Z0.000 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0.28 Y-0.09 Z-0.20 ; Put your endstop adjustments here, or let auto calibration find them
M208 Z0 S1 ; Set minimum Z
; Endstops
M574 X2 Y2 Z2 S1 ; Set active high endstops
; BlTouch
M307 H3 A-1 C-1 D-1 ; ;?
M558 P5 X0 Y0 Z1 H2 F100 T10000 ; Set Z probe trigger value, offset and trigger height
G31 X0 Y-19 Z2.4 P25 ; Set Z probe offsets, trigger height, and trigger value
M557 R110 S20 ; Define mesh grid
; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M569 P4 S1 ; Drive 4 goes forwards
M350 X16 Y16 Z16 E16 I1 ; Configure 16th microstepping with interpolation for all drives
M92 X200 Y200 Z200 E470 ; Set steps per mm (466 from cal 477 from bondtech)
M566 X1200 Y1200 Z1200 E900 ; Set maximum instantaneous speed changes (mm/min)
M203 X40000 Y40000 Z40000 E2700 ; Set maximum speeds (mm/min)
M201 X3000 Y3000 Z3000 E10000 ; Set accelerations (mm/s^2)
M906 X1100 Y1100 Z1100 E900 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S15 ; Set idle timeout
; Heaters
M307 H0 S0.50 A90 C700 D10 B0 ; Use PID on bed heater
M305 P0 T100000 B4725 C0 R4700 ; Set thermistor + ADC parameters for heater 0 - bed
M143 H0 S120 ; Set max bed temerature
M307 H1 A288.7 C130.7 D3.4 B0 ; Use PID on heater 1
M305 P1 T100000 B4725 C0 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set max temerature for heater 1
M307 H2 A288.7 C130.7 D3.4 B0 ; Use PID on bed heater 2
M305 P2 T100000 B4725 C0 R4700 ; Set thermistor + ADC parameters for heater 2
M143 H2 S280 ; Set max temerature for heater 2
; Tools
M563 P0 D0 H1 F1:2 ; Define tool 0
G10 P0 X9 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C
M563 P1 D1 H2 F1:2 ; Define tool 1
G10 P1 X-9 Y0 Z0 ; Set tool 1 axis offsets
G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C
; Fans
M106 P0 S0.9 I0 F100 H1:2 T50 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P1 S0 I0 F100 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S0 I0 F100 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off
; Custom settings are not configured
Does anyone know where i can start?
1. Okei i will try that whenever i have time!
2. I think this is the pressure advance:
M572 D0 S0.05
So not a lot i think.
It is not always when i retract it seems to be a little random. And adding the extra restart length gave issues on my other printers. Haven't tried it on this one. I thin k i might have missed some fundamental knowledge about 3D printing because i always had this issue to some extend.
On the Core XY i mentioned it looked like random under extrusions and then sometimes over extrusions. This is a picture from testing back then. I do not remember much of the settings though. But it was also short retractions around 2 mm.
Back then i thought i retracted to much so sometimes it would slightly jam and then suddenly over extrude as the jam cleared. Buuut i am not so sure anymore. I was using the minimal amount of retraction to avoid stringing.
I finally got to make some prints this weekend. I think this could become a really good printer, but i still have a few issues..
This thread is covering my two biggest issues: https://www.duet3d.com/forum/thread.php?pid=37203#p37203
Sorry for the image quality..
Hello people!
I have now finally gotten to make a few small prints on my DYI delta printer https://www.duet3d.com/forum/thread.php?id=4000
At the moment my setup is:
Bondtech QR extruder
40 cm Capricorn PTFE tubing
E3D Chimerra - 0.4 mm nozzle (So far only using one of the nozzles)
I have calibrated my extruder steps to be spot on.
This are the relevant pieces of my config.g (not complete)
[[language]]
; Drives
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X200 Y200 Z200 E475 ; Set steps per mm (477 from bondtech manual)
M566 X1200 Y1200 Z1200 E900 ; Set maximum instantaneous speed changes (mm/min)
M203 X40000 Y40000 Z40000 E4000 ; Set maximum speeds (mm/min)
M201 X3000 Y3000 Z3000 E3000 ; Set accelerations (mm/s^2)
M906 X1100 Y1100 Z1100 E880 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S15 ; Set idle timeout
; Tools
M563 P0 D0 H1 F1:2 ; Define tool 0
G10 P0 X9 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C
M572 D0 S0.05 ; Setup pressure advance
I must say, that i am generally very happy with the looks of my prints and i believe this printer can become very good! Here my third print:
However a few things is still to be addressed.
1. A 20 x 20 x 20 cube measures 19.8 x 19.9 x 20 (x,y,z). I have done 6-factor auto calibrations and are down to 0.016 deviations when i run a G32. Can this dimensional error be related to a delta arm value that is to low? If i think of it, i would rather think that to low a value would create a print that was to large and not to small. Am i wrong?
2. My other issue is something that have been haunting me for all my 3D printing adventures, both with my trusty old Hephestos Prusa with a cheap E3D clone j-jhead to a expensive Core XY with E3D V6 and dyzend.
I always get under extrusion after retracts.. (Pressure advance mittigates this effect a little but it is there with and without) Here is an example of my issue:
This part looks absolutely amazing.. until the thin section where retractions start to really happen. It is easy to see that when retractions happens for the first time, i get under extrusion.
This example print was printed at:
40 mm/s
200 degree nozzle
55 degree bed
ColorFabb black PLA
1.8 mm of retraction at 30 mm/s
0.2 mm layer height
Does anyone know what may be causing my problems? (I know there is a peremiter gap, but that is due to mismatch of extrusion width and model thickness)
Is this something that is already possible or ?
Yes but the post processing of the g-codes are exactly what i want to avoid..
DC42, yes either that or at least a setting so that the slicer would automatically include the m80 command as the first command..
Is this something that can be implemented in the Duet web interface? Could it be implemented that every time you start a print, the web interface would send a M80, like when i manually press the ATX on button?
I n´know it may seem like a silly small thing, but it would just be a nayz feature i think..
Thank you easy target!
But don't be jealous.. It seemed like a good idea on the drawing but in reality it is not! It makes proper wire management near impossible as all wires have to be at least 30 cm to long to be able to pull out the tray.. I will most likely ditch it and mount the board permanently instead.
I have a constant temperature all the way so shouldn't be the case.. Will look closely on the g-code tomorrow to see if I can figure out whether it's a slicer or firmware thing..
Dc42, if I do that, won't I then have to change something in the start code to use my second nozzle?
If I ever have to change values on the start code, then I would rather turn on the machine manually first.. But would be cool if starting a print automatically would send the m80 command before executing any of the print file…
Hello again!
Does anyone know how i can make my machine turn on (send M80) before the machine heats up?
I am using Simplify3D as a slicer. The problem is S3D inserts heating commands (and wait until heated) before my start-script. This means that the printer will try to reach bed temp without power, thus never getting to my M80 command from my start code.
I have read something on S3D's forum:
But i am not clever enough to understand what to put in my M140 and M104 so that i don't have to change it every time..
Currently this is my startscript:
[[language]]
M80 ;Turn on
G28 ;Home all axes
G32 ;Auto calibration
G29 S1 ;Load height map
This is what the slicer outputs:
[[language]]
G90
M83
M106 S255
G4 P500
M106 S0
M140 S60
M190 S60
M104 S200 T0
M109 S200 T0
M80 :Turn on
G28 ;Home all axes
G32 ;Auto calibration
G29 S1 ;Load height map
Another question:
My printer always makes a short pause of 1-2 seconds between the first and second layer. does anyone know why this is? (The fans start on the third layer).
Aaaah found my error. I had two G31 commands in the config.g file. Srry that was a stupid question then.
I am still getting used to this duet way of doing things. It is really clever once you get the hang of it!
Hmm it seems that i do not even have a config-override.g file..
Is this file a must have?
Thankyou Gone2Far! 
After spending my entire sunday on spaghetti it brought me significantly closer to my first print. tonight i also got to calibrate the motion system of the machine. everything seem to work, both the heaters, fans and BlTouch. Movement seem fast and tight. I am generally fairly satisfied so far. Here is a little motion demo.. i love the way these things move!
https://youtu.be/CvmyG0Acp_0
This is my heightmap after a couble of G32's (i think it is acceptable, correct me if i am wrong):
However i am a little confused. My BlTouch has a trigger height of roughly 2,4 mm. But this is my nozzle posistion at Z0 after the G32 auto calibration no matter if i enter the z ofset in G31 as 2.4 or -2.4:
What am i not understanding here?
Oh it would be really cool if it could be done via firmware in the future, i would be a big fan at least!
Less spaghetti in my electronics xD
But until then i guess there is no way around the relay then..
I will keep my 5V dcdc then. I want to be able to reach the machine over WiFi when in standby mode.
Once again, Thankyou for the quick and precise response!
Okei so only slow moves when absolutely necesary.. That is noted!
Thankyou!
Okei good to know, i will get the MCU calibrated then.
What is a okei temperature range for the MCU?