I too am having some issues with overhangs (tiny ones). I've tuned my print to my ability but cannot for the life of me figure out a good way to mitigate the issue.

Not sure what the rules on compensating for services are here but I'd love to have you take a look if you'd like. 🙏🏼🙌🏼

It depends on the model, my overhang tests are clean and clear for ABS at 30°as the protractor reads/60° degrees as the tests read. and that's without printing in an enclosure or with a Skirt, on a Original Prusa I3MK3. As well I commonly print ABS at these angles.

This is a 15mm thick print, and therefore any droop will be obvious, plus it's intended to fail at some point, as it goes from vertical to parallel to the build plate.

As you can see, it starts to fail between the 45 and 60 degree (from vertical) mark and starts to totally crump at the 80 degree mark or so.

This thread really helps.  I’ve got an outdoor project that will stare Southward into the Houston Texas sun.  My time honored PLA designs have not printed reliably in ABS, to put it lightly.  I had my first Blob of Doom on a design with 46.5 degree overhangs down low.  

By trial and error I’ve eliminated low layer overhangs in the the design, without knowing why that worked.  Going forward I’ll try your slicing options.

I’ve been running with The Prusa defaults for ABS of 255/110, in hopes of better inter-layer adhesion.  I was considering a drop in the heat, I think I’ll try fat extrusions for the bottom layers instead.

Thanks much

I can state with a very high degree of confidence that the Prusa I3 series can and will do a consistently good job of printing ~45 degree overhangs using ABS.

In the photo below (wow, used this same object as an example in three threads now) the internal ridge is a 45 degree chamfer, circular, and although it might not be obvious in the photo, it's clean and flat.  This was done with RepRappers white ABS using the default generic ABS settings.

One thing that you might try is printing one of those overhang test prints using ABS.  One I printed a while back (can't find it, otherwise I would post a photo) had varying angles and IIRC, the Prusa did an acceptable job even at on overhang 30 degrees relative to the build plate, which is really pushing it.  There are all kinds of these test prints out there.  Some of them actually go from 90 degrees relative to the build plate to zero degrees, and they are intended to fail at some point.  Watch it and stop it when it starts failing.

By trial and error I’ve eliminated low layer overhangs in the the design, without knowing why that worked.  Going forward I’ll try your slicing options.

I’ve been running with The Prusa defaults for ABS of 255/110, in hopes of better inter-layer adhesion.  I was considering a drop in the heat, I think I’ll try fat extrusions for the bottom layers instead.

Thanks much

Enjoy

I just want to thank you for taking the time to share your knowledge in another master class in 3D printing. This kind of information is invaluable to those of us still learning the ‘art’ of making things with molten plastic. 

Cheers!

Kind regards,

Your welcome, hopefully you'll get what you need from it, you can use the posted project file to help you work  your way through this, if you want to experiment I suggest using the cut tool, cutting at 10mm, setting top layers to zero and infill 10% to save time and material.

Regards

Swiss_Cheese