I’m going a bit mad… I have tried all the different types of support, auto and manually painting them on. I have played with the freehold angle on auto supports, removed “remove small over hangs” option etc etc. I just can’t get support material under all of this region circled in red, just as depicted in green in this slicing preview.
This is a functional part (150gram combat robot shell) so I’m not worried about surface finish really but the uniformity of the radius of the curve is affected a little bit where the support material is missing.
For reference I am printing in cheap Jayo PLA for prototyping and eSun ePLA-ST for the final parts. The flattened radius on the unsupported overhangs is noted with either material.
Any help much appreciated!
#edit 2025-02-14 19:13 GMT > attached .3mf file
MyFirstPlantBot_AllPrintedParts_A1Mini_V4_PLA-ST.3mf (1.1 MB)
Welcome to the forum.
Are you able to upload the .3mf file? You should be able to paint where you need the support but it is easier to explain it on with access to your part.
For reference.
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At a guess: When painting supports, you can opt to paint only areas meeting or exceeding the threshold angle (which you can adjust using a slider). Either change the angle (which is sometimes set to 0° by default) or disable this to get more control and freedom on support locations.
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Thank you for having a look that’s very kind. I’ve just attached the .3mf to the first post 
I did read the guide you linked, will now watch the video to see if there’s something not in the text / that I’m not understanding from the text.
I think this is what you want?
MyFirstPlantBot_Support.3mf (1.1 MB)
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Thanks for the reply, I assume you mean this slider arrowed. If so, yes. I’ve played with it to make a nice crisp line up an overhang to paint support enforcer up to but the slicer still doesn’t add support everywhere I’ve coloured for support material to go 
it is! you must be magic… when I try “snug” I get this:
Weird.
Couple things I would try.
Reboot/restart Bambu studio.
Erase all painting.
Make sure you are editing the “object” settings for the specific model.
What version of Bambu Studio are you using?
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you must be a wizard, when I reslice the plate in the 3mf you edited its perfect as in your screen snip.
With the settings changed to match in my 3mf project file it does this: 
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I’ve done the close-reopen loop of Bambu studio with no luck
done the erase all painting
and tried via object and via global settings
Version 1.10.1.50 - I normally let it update whenever I get prompted by a popup on opening Bambu Studio
I’ll try a laptop shutdown + reboot loop… about to pop out anyway so will give it some hours to sulk and maybe Bambu Studio / my laptop will be more cooperative on my return…
I’m using an older version of Studio (1.9.2.57) as I’m at work and I don’t run the latest here.
Maybe that is the difference?
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I think it might well be, the problem still persists on my version… I will raise a bug with Bambu Lab.
Thank you so much for modifying it on your version! This is the final iteration of this 150gram combat robot design and from your .3mf file with the overhang fully supported properly the rear of the chassis radius is beautifully preserved.
