[Request] Add optional perimeter to raft

[SamuelSVD]

Version

1.38.6-prusa3d-win64

Operating system type + version

Win 10 Pro

Behavior

• Describe the problem:
  When using a raft, even when configured correctly, the quick back and forth motion of the Prusa i3 Mk2 when it reaches the limits causes the raft to lift.

• Current problem:
  Here is where the raft lifts:
  

• Expected Result of Request:
  A perimeter around the raft should stop the lifting of the raft when it reaches the ends as the printed material should adhere to the perimeter:
  
  This could be implemented as an optional parameter (a checkbox) that only works when raft layers is greater than 1.

Is this a new feature request?
Yes

STL/Config (.ZIP) where problem occurs

Request.zip

[bubnikv]

Discussed with Jindrich, our print expert and Slic3r profile tweaker, he thinks we should make it a default feature without any additional checkbox.

Should we print the perimeter before or after the usual 1st layer support?

[SamuelSVD]

I think we should print the perimeter before the usual 1st layer support. This way the first layer will be able to adhere to the perimeter, reducing the probability for error.

[bubnikv]

I think we should print the perimeter before the usual 1st layer support. This way the first layer will be able to adhere to the perimeter, reducing the probability for error.

Jindrich has the same opinion.

[bubnikv]

Implemented with fcb714c

The 1st layer support or raft will always have a perimeter drawn around it.

Also there will be new parameters raft_first_layer_density and raft_first_layer_expansion
to influence the 1st layer of raft or support.