Getting layer of excess after 10ish layers

[ItsHavocc 0]

Hey team,

 

As you can see from the photos I am getting a consistent imperfection after a set number of layers with my prints. Could this be when it switches from a low initial layer speed to higher?

 

Any help would be greatly appreciated! If there are other settings that are strange and could be helpful for the overall print please leave suggestions!

 

Thank you in advanced!

Blake

cura profile.curaprofile CE3V3SE_Lid V1.3mf Lid V1.stl

[ItsHavocc 0]

Also would be great to have my base layer more consistent without the random small gaps

[Slashee_the_Cow 541]

If you could post a Cura project file 3MF (get it set up then go to File > Save Project) that's a lot easier to examine and contains more information than the individual elements.

[ItsHavocc 0]

CE3V3SE_Lid V1.3mf

[Slashee_the_Cow 541]

That's still only the model. Are you sure you're using Save Project and not Export (if you are, don't feel stupid, you're not the first and you won't be the last🙂)? If you're running Cura 5.9 you could also go to Help > Export Package for Technical Support and post that.

[GregValiant 1,454]

Look closely at that Initial Layer (a magnifying glass will help).  You can see that the extrusions are round rather than flattened against the bed and there are gaps between the extrusions.  That isn't right.  The extrusions should be flat, and welded together with no gaps between them.

 

As the nozzle moves along, and since the plastic hasn't been properly squished against the build surface, it tears free here and there leaving the characteristic blemishes.

The number 1 cause of that (99%) is an improper "Initial Z Gap" - your leveling.  Your profile calls for an "Initial Layer Height" of 0.16, but it looks like the "Initial Z Gap" is really making that much taller.  Consequently, there isn't enough plastic to fill the unanticipated taller gap.  Your "Initial Layer Line Width" is at 120% and that may be too wide for your extruder to handle.

Another cause can be simple under-extrusion.  Looking at the "bad layers" up higher, under-extrusion becomes a distinct possibility.  Even when the layers seem to be OK, there is "banding" on the walls and there shouldn't be.  That may indicate that the extrusion rate isn't consistent.

 

Depending on how the bed is being "leveled" (a misnomer if there ever was one) you can make an adjustment to the Z-offset (or use a thinner piece of paper), or you can set the "Initial Layer Flow" to something like 120% and do a quick test to see if the initial layer gets better.

 

Once the print gets taller you go from a print speed of 20mm/sec to 200mm/sec.  That means the flow rate is going from 1.3mm³/sec to 12.8mm³/sec all-of-a-sudden.  That usually is a Bad Thing.

[gr5 2,295]

1 hour ago, GregValiant said:

12.8mm³/sec

Wow - that's pretty fast!  What kind of printer do you have that can do that?  I mean my printer can do that but I never do as the odds of getting a failed print or just an ugly print is very high at that speed.  I suggest you stay under 6mm^3/sec with nozzles at 0.5mm and smaller.  13 is okay for large nozzles like a 0.8mm that can let a lot more plastic flow.

 

But that's for my printer.  You may have one of these modern printers that have very powerful extruders.

 

[ItsHavocc 0]

10 hours ago, Slashee_the_Cow said:

That's still only the model. Are you sure you're using Save Project and not Export (if you are, don't feel stupid, you're not the first and you won't be the last🙂)? If you're running Cura 5.9 you could also go to Help > Export Package for Technical Support and post that.

Ah apologies, is this the correct one?

 

CE3V3SE_Lid V1.3mf export-20250202-094826.3mf

[ItsHavocc 0]

8 hours ago, GregValiant said:

Look closely at that Initial Layer (a magnifying glass will help).  You can see that the extrusions are round rather than flattened against the bed and there are gaps between the extrusions.  That isn't right.  The extrusions should be flat, and welded together with no gaps between them.

 

As the nozzle moves along, and since the plastic hasn't been properly squished against the build surface, it tears free here and there leaving the characteristic blemishes.

The number 1 cause of that (99%) is an improper "Initial Z Gap" - your leveling.  Your profile calls for an "Initial Layer Height" of 0.16, but it looks like the "Initial Z Gap" is really making that much taller.  Consequently, there isn't enough plastic to fill the unanticipated taller gap.  Your "Initial Layer Line Width" is at 120% and that may be too wide for your extruder to handle.

Another cause can be simple under-extrusion.  Looking at the "bad layers" up higher, under-extrusion becomes a distinct possibility.  Even when the layers seem to be OK, there is "banding" on the walls and there shouldn't be.  That may indicate that the extrusion rate isn't consistent.

 

Depending on how the bed is being "leveled" (a misnomer if there ever was one) you can make an adjustment to the Z-offset (or use a thinner piece of paper), or you can set the "Initial Layer Flow" to something like 120% and do a quick test to see if the initial layer gets better.

 

Once the print gets taller you go from a print speed of 20mm/sec to 200mm/sec.  That means the flow rate is going from 1.3mm³/sec to 12.8mm³/sec all-of-a-sudden.  That usually is a Bad Thing.

 

Awesome, I have an ender 3v3 that has auto bed levelling. I will try run it again and manually adjust the nozzle to be closer to the bed.

I'll change the initial line width and flow rate.

 

In terms of speed, what should I be using? The 200mm/sec was just from the default profile in cura

[gr5 2,295]

Start with 50mm/sec and experiment from there.  Or ask someone who has the same printer.  But if it printed pretty good at 200mm/sec then I'd try half that I suppose.  But don't also increase layer height (or line width) as then you aren't changing the volumetric flow.

[Slashee_the_Cow 541]

4 hours ago, ItsHavocc said:

In terms of speed, what should I be using? The 200mm/sec was just from the default profile in cura

At that speed you'd probably need specialty "high speed" filament. Chinese printer manufacturers are in a pissing contest to be able to print a Benchy the fastest and a result we have printers that can go faster than is advisable. I actually had to turn down the maximum acceleration in my E3V3SE's settings or else it would just zoom off on travel moves and warp what it had just printed.

 

Most spools of filament will have the recommended printing settings (including speed) printed on the side. Follow those. It doesn't matter if your printer can go faster, you need to do whatever speed is right for the filament.