Option to change perimeter order

[rhys-jones]

Hi Sound

I noticed in V0.8.1 you changed the order in which the perimeters are printed to improve overhangs. Is it possible to make this a selectable option? I agree this improves overhangs but on a bowden setup its pretty much impossible to not get a small blob where perimeters finish (I'm reversing at 45mm/s and they are still very apparent for PLA). These used to be hidden inside the parts resulting in nicer prints.

Cheers

Rhys

[smartroad]

Would it be possible for Slic3r to detect when an overhang is greater then the extrusion width and swap the perimeters to suit. So a straight column or slightly tapered would print outside to inside, but a larger overhand Slic3r would swap to inside-outside. Obviously would still leave a blob to be dealt with when it detected an overhang but possible fewer and without adding another option to choose?

[rhys-jones]

I had this thought a couple of days ago, To some degree the over hang angle must already be calculated in order to do support calculations so I would of thought the fundamental code is already there. I'd imagine it would slow things up a little though.

[alranel]

@rhys-jones, do you think the feature described in #186 would help with those blobs without reversing perimeter order? That feature will be implemented, so you could test with that.

[rhys-jones]

I think that will probably do the trick.

[alranel]

Hello!
I implemented the requested option to invert perimeter order. It seems like the only way to have people agree on the best order is to leave freedom, as usual.

@smartroad, your idea is nice. However, I'm afraid of confusing users with unexpected behavior, so I think the option will be good for now.