[Pics of several 0.25mm nozzle prints; Looking for advice to improve.]

Hi and welcome

What is happening on the first picture?

Have you tried to up the temp a bit? seems a bit low to me

That was an attempt to print the Eiffel Tower. The temp is relatively low for PLA so that it does no overheat in the smaller nozzle. The nozzle used is a Solex 0.25mm.

[Pics of several 0.25mm nozzle prints; Looking for advice to improve.]

 

@swordriff, @gr5 (I mailed back the nozzle accidentally sent out)? You two seem to be small nozzle gurus.

[Pics of several 0.25mm nozzle prints; Looking for advice to improve.]

I have recently began testing small prints with 3d Solex 0.25mm nozzle on UM3 extended.  

The best settings using PLA are as follows:

0.6mm layer height (have also tried 0.1mm)

0.2mm line width (previously testing 0.22mm)

0.5mm wall thickness

Z hop off

Full retracts, Latest version of Cura default settings (have tried 6.5mm)

Temp 180 (have tried going as low as 175-190)

Speed test have ranged from 15-30mm/s.  I have done this by changing just the print speed setting and letting Cura adjust the others, and have also tried locking all movement speeds to the same number.

Bowden tube is all the way inserted in to the locking mechanism on both hot end and extruder.

Included are the pictures, these models have been scaled to 50%:

The last image has the worst stringing, this was before disabling z hop.

Any advice is greatly appreciated.