Fix bug in gcoder when there's no layer Z available

1ba50cb0 · Guillaume Seguin · c4dc0d2f · 1ba50cb0
Commit 1ba50cb0 authored Apr 03, 2014 by Guillaume Seguin
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gcoder.py printrun/gcoder.py +1 -1

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--- a/printrun/gcoder.py
+++ b/printrun/gcoder.py
@@ -468,7 +468,7 @@ class GCode(object):
                    ymin = min(ymin, line.current_y)
                    ymax = max(ymax, line.current_y)

-        all_zs = self.all_zs.union(set([zmin]))
+        all_zs = self.all_zs.union(set([zmin])).difference(set([None]))
        zmin = min(all_zs)
        zmax = max(all_zs)