Many thanks for these suggestions!
Re. making the supports stick: I forgot to mention that I had already set the air gap to 0 here. I have tried using brim, but actually found that to be less sturdy than the raft. The brim comes out with just one layer, which isn't very solid. I agree that the 3D model here could really be improved. For one thing, the supports are much taller than necessary. Then again, that's the challenge
As for the z-hop: My machine is from 2012, with no build plate upgrade, so indeed that might be a problem source -- imprecise repositioning in the vertical. As far as I can tell, the results are still somewhat better using z-hop than without.
My hope is to find some sweet spot of settings that will allow for the print to go through. I'll try some variations and post updates I make any progress.
Looks like your using raft. If you are try using brim instead or put the air gap to 0. You want those supports to be super tight o the build plate.
In Meshmixer there is a setting for the base of the supports. The one that touch the build plate could have a way bigger base.
Having Combing off add a lot more retraction while it may not need to. The ZHop is good but if I have read properly in the forum there are a lot of indications that the z screw on the UMO is not really precise unless you have the new build plate upgrade. Maybe you should remove zhop.
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