I currently have the following problem. The printed surface are uneven after I switched to a 0.2mm nozzle. With a 0.4mm nozzle I had no problems with the same filament. Settings taken from BambuLab’s standard profile for the 0.2mm nozzle. Temperature the same as always (220 degrees), layer height: 0.16mm and a speed of 40-60mm/s. I have already performed a complete calibration and an automatic flow calibration with the LIDAR scanner and cleaned the print bed with isopropanol before the print.
One thing to note, even if you have the same filament selected, the filament profile changes behind the scenes when you change nozzle size. If you open the use the compare presets icon at the end of the process line, you can set the settings for different nozzle sizes. Then you can see how the filament changes. In the image below you can see that even though it shows “Bambu PLA Basic” for .2 nozzle just like for .4 nozzle, but the actual profile changes to Bambu PLA Basic .2 nozzle.
Did you find a solution? I just switched out to a .2 nozzle for my first attempt at a 4 color lithophane. The Bambu Jade White PLA was used to print 2 of the light frame diffuser panels immediately prior to swapping nozzles and they printed beautifully. Now the same filament is printing like yours with the. 2 nozzle.
On my other printer this is usually an unlevel bed, a bad Z offset, or a dirty plate. I have tried now my Wham Bam, Bambu Cool plate, and the new Lightyear Garolite plates - all freshly cleaned and all with the same first layer issue.
Yes, I actually don’t have the problem anymore, but I don’t know exactly what caused it. I took the standard Bambu settings for the 0.2 nozzle everywhere in the slicer and reduced the speed a bit again and then carried out all calibrations again with the 0.2 nozzle. After that I didn’t have the problem anymore.
I continue to struggle with this. When I tried a plain 300x300x0.3mm square it printed much better, but when doing lithophanes using the 0.15 first layer as Bambu instructs I get a first layer that looks just like your reference images in the first post. It is not an adhesion issue, but more like an inconsistent extrusion or Z-offset issue. Going back to the 0.4 nozzle and I get a perfect first layer on the same lithophane.
I have tried different build plates (Bambu cool, Wham Bam, Lightyear G10), tried slowing down the first layer, tried lowering and increasing first layer nozzle temp, nothing has made it better (or worse).
I had the same problem and I could find a solution.
I was printing with the 0.2mm nozzle with 0.15mm layer height on the fist layer and 0.1mm on the rest of the layers. If I go beyond 0.12mm on the first layer, i get this pattern.
So the solution is to lower the layer height to 0.1 mm and it will print a perfect first layer.
When you change a preset, slicers looks at your filament profile and makes necessary adjustments to the settings accordingly during slicing. If any default setting works with a filament, probably all other default presets of that nozzle will work too.
On the other hand, when you change your nozzle to a different diameter, although the filament is not changed, Its profile has to be changed. This is not automated. You have to calibrate that filament with the new nozzle especially the maximum volumetric speed. Once you are satisfied you have to save the filament as new ie Bambu PLA 0.2 and when ever you use a 0.2 nozzle you need to choose Bambu PLA 0.2 as filament.
In OP’s case here is the issue. From 0.4>0.2 the difference of extruded volume is not reduced with half but about 1/8 because it is volume. If it the slicer tries to run the same settings of filament the amount it will try to extrude can not be efficiently output by the nozzle. You will end up with irregularities as OP or in worse case clogs.
