@briskspirit Yes. The fan is a 12V fan. I connected fan VIN (the red wire) to FAN1 V_FAN and fan ground wire to FAN1- . There is no jumper on FAN_VIN.
Hmm... This jumper selects the input voltage according to the schematic. It's not quite clear to me why my fans work, even though I have no jumper at all.
I will test it out this evening. I think you might have fixed the problem.
Thanks for your help.
Back to the original topic. I finally found some time to play with the printer again and tried your suggestions.
I have forced the steps per mm to 64 and did a test print. It did not fix the problem but the extruder motor was louder.
I have printed 2 hollow test-cubes next to each other. There were no signs of under extrusion but the retraction cylinders looked bad.
Finally I have decided to just use the extra prime amount for the time being. It gives me the good results inspite of my reluctance to use it.
Thank you for your input. I learned a lot about the finer details of extruders.
@deckingman OK got it. I'll do a print with 64 and 256.
Thanks guys for the input.
@deckingman @Phaedrux Sorry guys, I don't quite understand what you're saying. I currently set the microstepping of the extruder to 16 interpolated.
As far as I know, this sets the microstepping 256 virtual steps. I have tried setting removing interpolation but the motor gets noisy and whiny like it did with the cheap drivers.
I did a test print today with 0.075mm^3 extra prime after retraction and it printed OK.
It's weird though because I never had to use it before. I got the number from the E3D nozzle diagram for my 0.4mm nozzle.
@bot it's 407 steps/mm. You are saying that the g-code asks for so little filament that the motor doesn't even move?
If yes, then I think that's not the case. The motor visibly spins and at 45mm/s retraction speed it sounds like a zipper when you close it very fast. I lowered the retraction speed to 20mm/s because it got annoying.
@doctrucker I will test that. So I'll print 2 hollow cubes next to each other and label the respective walls on each cube (i.e. left wall on cube 1 with left wall on cube 2 will be labeled "A" for example).
Then after I print them at the same time, i measure the thickness of the wall A on cube "1" and the wall A on cube "2". The thicknesses should be within acceptable limits. Do I understand that correctly?
I normaly do 2-layer walls for the hollow cube test. Should I try a 1-layer wall as well?
@doctrucker Extrusion thickness is set at 0.4mm. I did a 2-wall hollow cube and measured the wall thickness. It's 0.79-0.80mm, so close enough.
Since yesterday, I've been messing with "extra prime amount" and I got one good print. I'm printing something else now to see if it does the trick.
Thanks for your input.
Hello gentlepeople!
I'm having a hard time understanding this issue. I wanted to print something at 0.1mm layer height and noticed that some layers seemed under extruded and the overall structure of the object was very weak and broke easily.
I decided to do some calibration prints. I printed a 2-wall cube. Each wall was 0.8mm thick, so all good. When I did the retraction calibration test print something strange happened: the two cyllinders seemed more like spiral skeletons than cylinders. The same test print works fine with a 0.2mm layer height.
I tried changing the following settings (one at a time). Here are the results:
My theory is that the filament is under extruded right after a retraction + move + re-prime. I use cura as slicer and all my print speeds are 40mm/s, travel speed is 150mm/s. Accelerations are 3000 mm/s2 and jerk is set to 25mm/s for all features. Retraction is set to 3mm at 20mm/s (20 mm/s because higher than that the motor starts singing when retracting with the titan extruder).
Below are some picture of the prints. The first one is printed with 2walls. The second one is printed with 3 walls.
My config file: config.g
I'm open to all ideas. Again, this only happens when I print at 0.1mm layer height. The printer used to be an Anycubic Mega i3