Hi everyone,
Since I’m brand new to the Sovol community, here is my first real question. I’m feeling a bit frustrated because:
I bought an SV08 Max and am using Sunlu PLA+ filament. I’ve fully calibrated the filament and entered the values into the slicer.
I’ve calibrated the following:
Temperature
Flow rate (Pass 1 + Pass 2)
Pressure Advance
Retraction
Max flow rate
However, whenever I print a model, I experience underextrusion on the print bed (see attached images).
Hello,
How did you adjust the height of the different layers?
Have you tried increasing the height of the first layer?
Is the Z-offset set correctly?
…
Aside from the calibration, I haven’t done anything to the first layer. Isn’t it enough to just run the printer’s calibration? What other settings do I need to adjust?
I know these are probably silly questions for you all, but I want to get the printer set up properly before I start printing.
Regards
P.S. I’m getting underextrusion at the ends, though it’s fine in the middle. You can see it in the photos. Of course, I’m happy to take more pictures if you need them.
Brims & support will do this sometimes…do you have a pic of the actual print..??
Something you already printed, we can’t help with just a pic of a brim…JMO
Your height map, seems to me, is showing a systematic error when your printhead is moving right VS moving left. Your mesh should NOT look like corrugated roofing.
There have been reports of loose bolts holding the printhead to the linear rail slider. Check to see if there is any looseness to your printhead.
I recommend opening a support ticket in case parts are needed to resolve your issue. Send Order #, description of issue, and the above screen cap to info@sovol3d.com. A close up video of your toolhead while a mesh is being generated might be good to send too.
So, I received a response from support and also tested it myself. In the pictures, I printed the entire print bed. Unfortunately, I can’t make much sense of the support responses:
The response regarding the height map:
Based on the heated bed effect diagram you provided, it shows an overall tilting trend from left to right. You can run the heated bed calibration several more times.
The response regarding underextrusion:
Additionally, judging from your first layer extrusion, the deviation value of the eddy current sensor may be relatively large. You can go to Mainsail and modify the value marked in the image below in the printer.cfg file. For example, if your nozzle is 0.05 units too high, then change -0.2 to -0.15. The calculation formula is: internal_endstop_offset = -0.2 + offset value.
Is the nozzle too high or too low? How do I find the correct value to adjust?
The underextrusion is mainly in the middle. If I change the value now, I’ll have overextrusion on the sides
All the screws I used were also checked. Some of them were indeed loose.
How does your mesh look now? Klipper raises and lowers the nozzle while printing to follow the mesh. If the mesh is incorrect then you get thick spots and thin spots.
Even with a perfect eddy the mesh can miss bed height changes between sample points. If your workflow requires perfect bottom layers you will need to change the spacing for your mesh points to get a mesh that accurately shows the bed shape.
The alternative is to flatten the bed. I use 2mil kapton tape on top of the magnet sheet. Temporally set your mesh to generate points every 15mm. Look at at the mesh, remove the build plate and “shim” the low spots. Rinse and repeat. If you have localized high spots they can be sanded down slightly without significantly effecting the magnet. Your bed will still change slightly with temperature but eliminating the smaller imperfections makes it so Klipper can better follow the contour when printing.
Support told me to repeat the mesh creation process a few times, but nothing changes… and how could it? It’s the same print bed every time. That’s why I find Support’s answer rather counterproductive.
If I adjust the spacing of the measurement points (by reducing it), things get even worse.
I simply don’t understand the point of the eddy current sensor if it doesn’t compensate for the unevenness and I have to manually (“analog = internal_endstop_offset: -0.25”) raise the nozzle in the system. The surface remains uneven regardless; then the areas that were previously fine end up being affected.
Just to keep you all updated—or for the information of others—I’ve been in contact with Sovol support this whole time. After none of the settings changes helped, they are sending me a new aluminum plate. I’ll let you know if that works, of course.
