Bad banding problem


#1

So my first Form 2, Cool Porpoise printed beautifully out of the box. Unfortunately, after a month of use it started having problems sensing resin, and after going back and forth with tech support they told me to send it back and they replaced it with a new printer, Fabulous Cria. In over a year and a half I have never had a perfect print from this new printer. Some days it is worse, some days better. Usually on very small parts it is not so bad, but if I want a really good flat surface I have to print with that surface parallel to the build plate.
This looks like a problem with the build plate, but it is tight… I can’t feel any movement when it is locked down. I even bought a new build plate with no luck. I have tried several resin tanks with no change. I have lubricated the leadscrew with Superlube.
This part is printed with Grey V4 at .1mm.
Any ideas?


#2

I would suggest to perform the optic test you can find in the forum. Just to be sure that there are no disturbances in the optical / beam path.


#3

The regular lines remind me just on our printed parts before we got some bigger issues. After the cleaning (see link to the Topic) they are gone too.


#4

What does the cross section of that print look like? If it’s not hollow, that seems like a pretty large cross-section area, which will exhibit some degree of banding due to peel forces.

Do you get loud pops/clonks during peel?


#5

Yes, but I get those no matter what size object I am printing. I agree that it has to do with the peel action… I think the tray doesn’t return consistently to the same place after the peel. Thing is, on my first printer I printed objects like this all the time with no problems, Peel noises were almost non-existent then.