Avoid crossing perimeters (slow) option?

Can anyone contribute some insight on what the slic3r option "Avoid crossing perimeters (slow)" is for?

I found that many files do not slice if this option is checked on.

Let's say you have two cubes side by side

[ A ] [ B ]

the [ ] are the perimiters.

If the slicer wants to go from A to B, it could sometimes calculate a path from the left [ of A all the way to the left [ of B. This will cause it to cross the right ] of A.

This is "crossing the permiter of A"

So this tells the route planner to look for a way to go from A to B without crossing. So it will try to go from the right ] of A to the left [ of B.

Hope that helps.

In more complex shapes, it could have the G code travel the nozzle around the interior of your print to go from point A to point B looking for an exit to cross over.

Edited 1 time(s). Last edit at 05/26/2015 12:42AM by thetazzbot.

cool that makes sense, thanks. Having it checked on generates a better print?

On my complex shapes it wont make the g code with the option turned on.

Quote
thetazzbot
Let's say you have two cubes side by side

[ A ] [ B ]

the [ ] are the perimiters.

If the slicer wants to go from A to B, it could sometimes calculate a path from the left [ of A all the way to the left [ of B. This will cause it to cross the right ] of A.

This is "crossing the permiter of A"

So this tells the route planner to look for a way to go from A to B without crossing. So it will try to go from the right ] of A to the left [ of B.

Hope that helps.

In more complex shapes, it could have the G code travel the nozzle around the interior of your print to go from point A to point B looking for an exit to cross over.