[Acceleration and Jerk settings in Cura]

I was wondering...is there a default acceleration and jerk setting that Cura sets up in the G-Code if you leave them undefined? I ask because I use both Cura and Simplify3D...I noticed that my Cura prints have a better finish than my Simplify3D prints but that modifying my acceleration and jerk settings in the printer itself helped my Simplify3D prints quite a bit but didn't do a thing for my Cura prints of the same object. So it seems like maybe Cura is defaulting acceleration and jerk to lower values to get better prints.

[Need help with thin wall printing in Cura]

I've made several changes since the original post...upped the heat to 220 degrees, slowed down the print to 40mm/s, took out the z-hop I had, and lowered the layer height to .15. These all helped but the problem isn't gone. There are less thin sections but still several holes. When I watched the print a few times it seemed like the extruder was stopping about .5mm short of the start point when hopping to a new start point. I have a feeling this is where the holes are coming from.

[Need help with thin wall printing in Cura]

Did you see the problem in layer view?  Could it just be skipping that section?  Thin walls sometimes dont' get printed.  Try setting nozzle width/line width to 0.2 just to see what happens in layer view.  You can certainly fudge it a bit - .3 line width with a .4mm nozzle will work.  In cura 15.X it's critical to make the shell width a multiple of the nozzle width.  If not it will ignore the nozzle width.

In layer view only the 1st layer shows internal structure...which is probably why it prints that way too. I haven't been able to figure out how to get the interior structures to show in layer view.

[Need help with thin wall printing in Cura]

Hey, I just finished printing 2 P47's from 3d labs using Cura 2.6. I can confirm their supplied settings will work with a few speed and retract settings.

What I did first, and it helped a lot, was I nailed the "First Layer Height".

I printed a 1 line skirt, stopped the print, measured it, and adjusted a G92 Z in my printer config to establish a perfect First Layer Height.

Huh?  What's a G92 Z?

Next, I printed a one walled test box, about 50mm square, maybe 10mm high. Measured the wall thickness and adjusted my extruder percentage. Currently I am actually at 89% even though I calibrated my extruder steps perfectly. Not sure why its so low, but it produces awesome results.

I did a 1 wall heat test and flow test and came out with 210 degrees and 105-110% flow for best layer adhesion.

Once this is done, I printed my main parts, Fuselage and Ailerons using,

67C Built Plate, 220C Print Temp First Layer, 210C everything else.

.15 - .25mm Layer Height (I am currently printing at .15, but had great results at .25 too)

.4mm Wall Thickness,

0% Infill,

No Top or Bottom layers.

Print Speed ("Wall Speed") around 30mm/s,

Travel Speed - 200mm/s

Initial Layer Speed - 17mm/s

Pretty close to the same settings I have been settling on with Cura 15.4.  Except for the travel speed.  I'm not sure my Anet A8 is capable of those speeds.  I've tried up to 150mm/s and it doesn't seem to be going any faster than at the lower settings.

Now looking at your pick, I am guessing you have an oozing problem from possible poor retract, or moving to slow from point to point to point. This is why I jacked my travel up to 200mm/s.

I also have a direct drive extruder, so if yo got a bowden style, you may have to greatly increase your retract settings, but for reference if you want to try, here are mine:

Enable Retraction -Yes,

Retract Distance - .8mm

Retraction Speed - 25mm/s

Retraction Extra Prime Amount - .16mm^3

Minimum Retraction Travel - .8mm

Mine is direct drive also. I've tried from a .5mm retraction distance all the way up to a 20mm retraction distance and still have the same amount of stringing.  Wouldn't you want a faster retraction speed to reduce stringing?

I will get back to Retraction Extra Prime in a sec.

Now I was getting strange issues like you had, and I was also getting blotches all over the print, so I changed my Z seam to be aligned into the same location on the model. When I found when I did this, was every time I went to start a new layer, my nozzle would ooze a tad and when it went to start the next layer, I had a bit of an under extrusion right at the start. Very hard to see this if the Z seam is scattered all over the place randomly. Once I aligned the seam, I could clearly see the under extrusion, and so I adjusted the "Extra Prime" amount. I had to play with it a bit, but I got a good value that works pretty well.

Good luck, enjoy. This was a blast trying to print these models. I wasted a whole spool of filament trying to dial it in before I printed my real one.

What is Z seam? And how does one align it?

With 2.6.2 I'm not even this far because none of the internal structures print or show in the layer view beyond the first layer.  The pic I posted was using 15.4.

[Need help with thin wall printing in Cura]

 

[/media-thumb]Hi all, I've been trying to find a solution to this all over the place but no one seems to have the right answer yet. I'm printing a rc model Spitfire from 3d LabsPrint and having an issue. Using Cura 15.04 as the settings provided by 3d LabsPrint are for that version, the outer skin of the plane prints nicely but I end up with gaps in the print on the inner structure pieces. When I watch the printer closely it appears to be the gaps are from where the printer has a retraction and moves to or from that place. There is an oval shaped tunnel in the wing for the servo wire to go through and the issue is most noticeable there. It looks like when the print head goes around the oval the start and stop point do not meet up. I've also tried it in 2.5 and 2.61 with no success because some of the manually set settings for the print have dependencies to other values so it won't let me change them. When I tried I ended up with just the outer skin printing and no inner structures. This is getting really frustrating...no matter what settings I've tried to tweak so far the problem persists. Also this starts happening at 3% of the print. Up to that point the print is very good.