The Case of the Disappearing Supports

I’ve had this happen a few times now, usually at 50 micron Z resolution and black resin:

The supports are missing, but it’s not a matter of them going missing mid-print - they never built off the base in the first place. There’s a very slight bump on the base where they should’ve grown off of, but that’s it.

(As you can see, it’s not a failed print, as the “missing” supports managed to “recover” mid-air near the end from the branches of the nearby supports and the object itself printed fine as there was plenty of redundancy.)

So here’s the thing - i don’t get what might the cause be. I thought it’s that the base isn’t thick enough, but i’ve printed a few prints immediately before this one, with a 1mm base and those were fine.

Any clues on what else might be the cause?

I used to occasionally see that if my build platform was over compressed, but that doesn’t appear to be the case here. Have you tried printing the part in a different location or rotated 90 deg? It would be interesting to see if the location affects it. Also, did you try reprinting the same job? It could just be a fluke.

Haven’t tried 90 degrees, but tried a different location. I also tried a different print in the same location. I can’t successfully and consistently replicate it nor find any correlation with anything, except, possibly, layer height and base thickness.

What i did notice is, that when it happens, the height where the supports begin coincides with the place where i’m seeing layer splitting in the base itself - in the release tabs. I.e. when it happens, the tabs became malformed too, crack very easily and are sometimes even completely deformed and mushy.

(Edit: you can see it in the photos above too - look for the tabs, they’re deformed enough to be almost hard to even recognize.)

(Edit2: it might be that my platform is tweaked too low too, i’ve had to lower it by 0.3-0.4mm in order to get prints at 50um to stick to the platform when using black resin.)

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.