Test cube - Left and Right walls are thinner?

[LePaul 331]

Printing with some PETG and dialing in the flow settings for a 0.8mm bead went well.  I'm using a 0.6mm nozzle.

The print will have two walls, so I did a test cube with that, expecting 1.6mm on all sides, or at least close.

 

I got this...

 

Here's my settings.  Am I missing something obvious?

 

[Slashee_the_Cow 442]

You're not missing anything obvious that I can think of. If you post a Cura project file we can see if there's something un-obvious that you're missing but I can't think of any settings that would affect only the X or Y axis off the top of my head (unless you use the "Printer Settings" plugin and go into things like changing max speed/acceleration for one axis).

 

That makes the obvious candidate (in my eyes, anyway), your printer. It's possible the Y axis is moving faster than the X axis resulting in relative underextrusion. Whether that would be because the Y axis is moving too fast or the X axis is moving too slow... I wouldn't know. It's possible it just might need some lubrication or something? I'll leave the hardware side of things up to @gr5 who hopefully will see that tag and come in with wisdom.

[gr5 2,237]

I don't have any ideas.  But I usually don't expect my printer to be able to print with 0.1mm tolerances.  It would be nice though.  This is with your UM2+ ext?

 

Do you have a 0.8 nozzle?  That might help.

[Slashee_the_Cow 442]

@gr5 sorry for throwing you under the bus apparently. Trying a 0.8mm nozzle might help, especially if your layer height is tall. Probably can't hurt to try. Unless you burn yourself changing the nozzle. But I've only done that once 😁

(Although I'm guessing with UM printer cores you don't change them hot?)

 

I don't know what the stated accuracy is for proper printers as opposed to my Chinese crap, but the specs for the E3V3SE say it should have an accuracy of ±0.1mm. So those values would technically fall into the promised range for me, but I'd hope an UltiMaker would be able to pull off a better job than a low-end Creality printer.

 

It might also be worth contacting UltiMaker support (especially if you have a 0.8mm nozzle on hand and it has the same problem, but even then, a 0.6mm nozzle should be able to pull off 0.8mm lines consistently).

[LePaul 331]

I'm noticing the Outer Wall speed is 25 while the inner wall speed is 50 mm/s

 

Should those both be set to 25?

[gr5 2,237]

I recommend this, yes!  I like to set all the printing speeds to be the same speed.  I don't like speed changes as it takes several cm to equalize pressure after every speed change.  Particularly with bowden printers.

 

You can also think about doing outer walls before inner walls.  On the "engineering" profiles from UltiMaker, I believe they all do outer walls first but I believe the default is to do inner walls first.

 

Actually you might want to look at the engineering profile for say an S5 and see what's unusual but I know it sucks to look at 500 settings.

 

https://support.ultimaker.com/s/article/1667411132905

 

This is what a UM employee told me years ago about the engineering (high dimensional accuracy) profile:

 

dimensional accuracy profile - engineering settings  - accuracy mode
Line width: 0.4
Wall thickness: 1.2
Top/Bottom thickness: 1.2
Speeds: 35-40 (first 7 speeds, all except travel)
Jerks: 20
Horizontal expansion: -0.03
walls: 3
Inital Layer Height = 0.1
Slicing Tolerance = Exclusive
Combing Mode = off
Outer before Inner Walls = Checked