Use one loop for draft shield

[vovodroid]

Currently draft shield loops number is set by skirt loops option. If it's set to one

there is a high chance it will be disconnected because of shield warping. If it's set to several loops

there is a lot of time and material waste (and probably adhesion is also affecting by thick wall warping).

This PR sets draft shield to one loop:

thus combining good bed adhesion and draft protection.

Actually draft shield loops number could be configurable, but from my extensive usage of draft shield with materials like ABS/ASA it's not necessary. Three-five first layer loops and one loop shield works very good.

[igiannakas]

THANK YOU!! I was busting my head on how to do the same when I enabled the feature and could not figure it out no matter what I tried! So I gave up :) That is a nice and simple fix! Well done for this!

[SoftFever]

Looks good.
Thank you!

[vovodroid]

Hi @SoftFever ,

I put attention that Limited Draft Shield value actually has no meaning, as skirt is the same anyway.

But before this PR skirt/shield has Skirt loops loops for Limited/Disabled

and now it's one loop in both cases:

Question is whether one need tall multiloop skirt/shield?
We can use one loop for Limited Draft Shield, and multiple loops for "Disabled", or just remove "Limited" option (I guess it's better).

What do you think?

[vovodroid]

Actually Draft Shield parameter also becomes excessive, one may just set skirt height to big enough value.

[igiannakas]

Actually Draft Shield parameter also becomes excessive, one may just set skirt height to big enough value.

I’d keep the draft shield as not all users relate to this as a work around. Plus it’s automatic in its height vs trying to calculate it manually. Prusa has this available so for consistency between slicers I’d suggest it’s retained.

For draft shield you don’t need many loops to be honest. One can make the argument that a one wall draft shield is weaker and may crack, but so will a multi wall one, so I’d say just just keep one option - enable draft shield and you’re done. I think 😀

[vovodroid]

one wall draft shield is weaker and may crack

It warps, not cracks. but still glued to the base. Multiple walls produce stronger detaching force.

I’d say just just keep one option - enable draft shield

So just OFF and ON. I agree.

I'm preparing PR for object skirt/shield, so I will also remove "Limited" option.