diff --git a/extensions/fablabchemnitz/box_maker_t_slot/box_maker_t_slot.inx b/extensions/fablabchemnitz/box_maker_t_slot/box_maker_t_slot.inx
index 2ec441f8..f82c1a77 100644
--- a/extensions/fablabchemnitz/box_maker_t_slot/box_maker_t_slot.inx
+++ b/extensions/fablabchemnitz/box_maker_t_slot/box_maker_t_slot.inx
@@ -34,7 +34,9 @@
all
-
+
+
+
+
\ No newline at end of file
diff --git a/extensions/fablabchemnitz/set_css_class/set_css_class.py b/extensions/fablabchemnitz/set_css_class/set_css_class.py
new file mode 100644
index 00000000..91fba752
--- /dev/null
+++ b/extensions/fablabchemnitz/set_css_class/set_css_class.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+"""
+Sets a css class on selected elements, while optionally removing the elements' styling.
+If inline styles are not removed, the css class might not have effect.
+
+Inspired by MergeStyles (and best used together with it).
+"""
+
+__author__ = "Mois Moshev"
+__email__ = "mois@monomon.me"
+__copyright__ = "Copyright (C) 2017 Mois Moshev"
+__license__ = "GPL"
+
+import inkex
+import sys
+
+class SetCSSClass(inkex.EffectExtension):
+
+ def add_arguments(self, pars):
+ pars.add_argument("--name", help="Name of css class to apply")
+ pars.add_argument("--clear_styles", type=inkex.Boolean, default=True, help="Name of css class to apply")
+
+ def effect(self):
+ newclass = self.options.name
+ elements = self.svg.selected.values()
+
+ for el in elements:
+ current_classes = el.attrib.has_key("class") and el.attrib["class"].split() or []
+
+ if newclass not in current_classes:
+ current_classes.append(newclass)
+
+ if self.options.clear_styles:
+ el.attrib["style"] = ""
+
+ el.attrib["class"] = " ".join(current_classes)
+
+if __name__ == "__main__":
+ SetCSSClass().run()