Z-Seam Gap and print surface problems (left and back side only) when printing with a 1mm Nozzle

Hey there!

I bought 1mm nozzles for a specific project, attempting to gain visible layer lines and added stability.

It is just…

There is a gap of about 1mm, give or take, at the Z-Seam.

I can still work with the pieces, as I planned on sealing them with epoxy resin anyway, but given that I still need to spend a week of printing to get everything done, I want to avoid the next prints having the same misprint.

Naturally, I tried to change slicers, switching from Cura to Orca.

I set:
Seam position: aligned
Seam gap: 0% from 10%

The print speed is set to 30mm, as I do not yet know the melt volume of my replacement hotend. 30mm assumes a little above 14mm3, which is the “no risk taken” setting assuming a regular ender 3 hotend melt volume. It is highly likely the hot end could handle more speed - the same melt volume means 175mm/second for a regular 0.4mm nozzle at 0.2 layer height.

Cura attempt, 100mm height:

Orca attempt, 150mm height:

As you can see, Orca does slightly better, but both results are horrible.
0.4mm nozzle prints work perfectly.
I also do not experience underextrusion with the 1mm settings.


This is the orientation of the print. It starts with the one at front right, does back right next and finishes with the left one.
The second pillar of all prints looks slightly more horrible, the last one slightly better.

Do you have any idea on how to fix this?


Better image of the Orca attempt. It does a little better?
Arachne something, I guess, though I have no idea…

Not sure what causes that but after Orca and Cura maybe give Creality Print a try.
I haven’t printed with a .1mm nozzle yet so just guessing here…

Experiment with the Z seam settings.

Forgot to mention: the insides of each tube has the same Z-seam gap, just at a different position. So I assume the printer starts extruding too late?

I should do some test prints in vase mode.


Negative 3mm seam gap.


Negative 3mm seam gap, no retraction


Negative 3mm seam gap, regular retraction

Doing a “pressure advance” test tower next.
Switching to regular wall mode compared to Arachne also led to much more uneven/ugly walls…

I don’t know if I did something wrong, but the seam of the pressure advance tower looks exactly the same to me at every single height. Should add 0.02 per layer.

Another issue popped up, though, one I have already seen in the other test prints: The left and back side of prints have a very bad surface. Especially the back side.

Is this issue related to cooling or something? I didn’t change anything with the stock fans or fan settings…



Just for clarification: the big pillars posted at the start of the thread have been printed with the left one of my two Ender 3 V3 SE. The right one produces the very same Z-Seam gap, indicating the issue lies within the slicer settings, but additionally gives its prints a bad surface and seems to struggle with placing one line of filament directly on the next lower level when they should be perfectly vertical. (though both of these could be the very same issue)

The sole difference between the two printers is a replaced hot end on the left (working) one.

Update: I fixed the surface damage. Turns out the x-axis assembly (extruder, hotend etc) was wobbly. I don’t know how this happened, though.

Adjusting the wobble fixed the issue immediately, but I still upgraded the hotend, as I had planned to do for a while.

The Z-Axis seam became less noticeable with retraction turned off for 1mm nozzle specifically, but it still needs post-print work to look good.

Wow. That wobble caused a lot of problems… Glad you diagnosed it…

How did you adjust this wobble so others can check theirs…?

Its a V3SE it’ll be those rubber wheels that move along the gantry, adjusting the concentric bolt on the bottom wheel will cure the wobble (or go completely overboard like me and fit a linear rail)

I did indeed adjust the bottom wheel. But for some reason, I had to adjust the side towards the hot end, not the side towards the back of the printer - tightening this side did nothing.

As for linear rails… they are nice, but I don’t think I have the budget for that. Just looked them up, and they are twice the price for one printer I am planning to spend on ceramic hot ends for both of them combined. Still. A nice upgrade. Wish it came with that from the start.

Linear rails on Aliexpress were less than £20 last time I checked, as cheap as a pair of nozzles for one of my printers. Yes it would have been nice if they were fitted as standard. I have 4 boxes of rubber wheels in my spares box for my Ender 5 plus, toying up whether to put linear rails on that and perhaps go full core XY on it.

Checked on Aliexpress but the first result showed 60€. Didnt search for long enough, I guess. Your <20 are likely correct if you spend the time looking for a better offer.