Brims disappearing

[papilio]

Hello!

Today I'm finding that both newly created and previously good files are not rendering the brims. It happened also a week ago but rebooting cleared it up, not this time.

When I re-open old factory files, some show brims and some now have them missing. But even on files where the brim appears to be intact upon opening, if I edit the settings in any way it's gone. If I attempt to print even old factory files which do show a brim (I typically create two brim outlines about 5mm from the part to prime the nozzle), at best only one outline will print, sometimes not even a complete loop.

I'm also noticing, again just today, that retractions are not accurately showing up in the preview -- see image which also shows the missing brim.

I've tried System Restore as well as re-installing with a fresh copy, no help.

Any ideas? I've tried Googling as well as searching this forum.


Thank you!

[rrdavis]

It's because the bottom of the part is not flat. Right now it has to sit at Z=0.06mm. If you lower the z-axis offset to 0.0mm (placing some of that uneven surface below the bed), then it works fine.

[papilio]

Hi rrdavis, thank you for the reply. That's quite interesting, as is the solution!

And of course you're quite correct, it works. I was puzzled at first as the model (created in Rhino v5) ought to have had a perfectly planar bottom surface as it had been shaped by the boolean subtraction of a box. But I looked more closely and realized that the model was not in this case a watertight closed mesh -- the fillets on the corner holes had broken through the bottom even thought I'd not gotten a "failure to create fillets" after the operation.

So as is so often the case, user error.

Thanks again!


- Michael

[greg]

It's because the bottom of the part is not flat. Right now it has to sit at Z=0.06mm. If you lower the z-axis offset to 0.0mm (placing some of that uneven surface below the bed), then it works fine.

How can you see that ?
I'm having trouble where when I skirt to be a brim by reducing the distance to zero - it still leaves a one line space between the skirt(Brim) and the part when it gets printed.

[dkightley]

How can you see that ?

The part is "floating":

.....and not related to your issue!