Profile for Ender 3 V2 with 0.8mm Nozzle

[anthonyrossi01 1]

I am trying to print very large items that do not require a lot of detail on the Z-axis. Because of this, I have an Ender 3 V2 (4.2.2) running Marlin 2.0 setup with a 0.8mm nozzle. I have seen a lot of information that printing up to 0.6mm heights should be fine with the nozzle however in testing some more challenging pieces of a larger print, I have discovered that I get some pretty unsightly issues at anything over 0.4mm layer height.

The main issues I have are.
1. Anything over 0.4mm layer height produces blobs on most of the Z seam.
2. Anything over 0.4mm layer height produces inward bowing of the walls at tight corners.
3. Even with a 0.4mm layer height, there is still some blobs on the Z seam at the tops and bottom of print walls.

I have attached both a Cura profile of the 0.56mm layer height I have been trying to get work and the Cura project file of the example. If you have experience with this, please let me know what I am doing wrong.

Thank you!

Problem Part.3mf 56 with 0.8 nozzle.curaprofile

[anthonyrossi01 1]

Was this approved?

[anthonyrossi01 1]

I think thats about the fastest anyone could test the supporting ecosystem of a company. Took about 2 minutes at Prusa to get answers, It's been 22 hours on Ultimakers forum and no one has even put up a bad guess.

[Smithy 987]

7 hours ago, anthonyrossi01 said:

Took about 2 minutes at Prusa to get answers

I'm glad, then you will have already received all the answers that are important for you.

 

To be honest, I find it very daring to be frustrated here just because no one took care of your Ender printer problem within 22 hours.

 

To be clear, this is the Ultimaker forum. You may want to slice with Cura, but your question is very printer specific. So you'll have to be patient and wait for someone who has an Ender printer to look at it.

Or you can ask directly the manufacturer of your printer, but ohh I forgot, there is no support from Creality.

 

So please be kind and have patience, we help everyone here.

[anthonyrossi01 1]

On 1/28/2021 at 3:26 AM, Smithy said:

I'm glad, then you will have already received all the answers that are important for you.

 

To be honest, I find it very daring to be frustrated here just because no one took care of your Ender printer problem within 22 hours.

 

To be clear, this is the Ultimaker forum. You may want to slice with Cura, but your question is very printer specific. So you'll have to be patient and wait for someone who has an Ender printer to look at it.

Or you can ask directly the manufacturer of your printer, but ohh I forgot, there is no support from Creality.

 

So please be kind and have patience, we help everyone here.

Really... It's March, where are those answers you were talking about? Also, the issue was not specific to the printer at all, it was entirely a Cura issue. I don't know how you can be wrong about so much and yet still not post anything remotely helpful at the same time. 

 

How are you telling me to be kind while also taking a cheap shot at another company? PERHAPS because if something is GARBAGE, it's not "unkind" to call it what it is? At least what I said was relevant to the space. 

 

To be polite as possible, I recommend you take a hard look at what you are doing as I'm not the one who is out of bounds here.

[GregValiant 469]

My only printer is an Ender 3 Pro.  I stay out of the Ultimaker Printer threads because I don't own one and don't know enough about them to try to help with the hardware.

It is the same sort of situation with this thread.  I have never printed with a .8 nozzle and so I wouldn't know where to begin trying to develop a profile.  I also didn't want to give advice that would be (at best) uninformed, and possibly completely wrong.

You did not mention your hot end.  I do know that the stock Ender 3/5/CR-10 hot end is not very capable.  Using a .4 nozzle and line width at .2 layer height means it is filling a rectangle under the nozzle that is .08mm².  At a print speed of 50mm/sec that is a flow rate of 4mm³/sec.  That is good enough for printing minis and other small items.  That is right in the wheelhouse of what Creality was shooting for.

Moving to a .8 nozzle/line width at a layer height of .56 means you are filling a rectangle of .448mm².  At the same 50mm/sec you are asking the hot end to deliver 22.6mm³/sec.  If you do have a stock hot end then that little sucker has to put out 5.6 times as much plastic as its design median.  Getting the flow rate down to 4mm³/sec would require a print speed of 8.9mm/sec.  That's where the stock hot end/extruder combination would be happiest.

Retraction distance?  Retraction speed and prime speed?  I have no idea.  You have put yourself at the pointy end of the stick and are going where few have gone before.  I would think you'll need to make things up as you go.  It's possible that at .4 layer height you found the upper limit of what your hot end / extruder combination can deliver.

 

I bought the Ender because it was cheap.  I replaced the mainboard when it cooked the Estep driver, and then again when it burned the 24v connector.  Two fans died prematurely.  I had to replace the cheesy plastic extruder with an aftermarket aluminum unit.  The layer cooling fan was a joke and so that got replaced.  I run a Micro-Swiss hot end as the first TWO stock units didn't get the job done.  The stepper motors are fine and the machine is well calibrated and makes good parts.  But the tune is on a knife edge.  The littlest thing can knock it off tune, and then the trouble shooting starts over again.  I think that if I was going to run some sort of production that required a .8 or 1mm nozzle that I would either get a printer configured for 2.85mm filament, or contract the parts to have them injection molded.