From 39df7582c026d115ba319c04709fe9366f8ab6da Mon Sep 17 00:00:00 2001
From: PavelMikus <pavel.mikus.mail@seznam.cz>
Date: Fri, 3 Mar 2023 11:44:40 +0100
Subject: [PATCH] Fix freeze/crash happening when slicing with 0 perimeters

---
 src/libslic3r/LayerRegion.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libslic3r/LayerRegion.cpp b/src/libslic3r/LayerRegion.cpp
index 0777c5ef78..0adc8f4cf8 100644
--- a/src/libslic3r/LayerRegion.cpp
+++ b/src/libslic3r/LayerRegion.cpp
@@ -355,6 +355,8 @@ void LayerRegion::process_external_surfaces(const Layer *lower_layer, const Poly
         shell_width += 0.5f * external_perimeter_flow.scaled_width() + external_perimeter_flow.scaled_spacing();
         shell_width += perimeter_flow.scaled_spacing() * (num_perimeters - 1);
     } else {
+        // TODO: Maybe there is better solution when printing with zero perimeters, but this works reasonably well, given the situation
+        shell_width = SCALED_EPSILON;
     }
 
     // Scaled expansions of the respective external surfaces.