diff --git a/extensions/fablabchemnitz/slic3r_stl_input/slic3r_stl_input.inx b/extensions/fablabchemnitz/slic3r_stl_input/slic3r_stl_input.inx
index 410f1f6c..1ff0167e 100644
--- a/extensions/fablabchemnitz/slic3r_stl_input/slic3r_stl_input.inx
+++ b/extensions/fablabchemnitz/slic3r_stl_input/slic3r_stl_input.inx
@@ -10,7 +10,7 @@
             <param name="inputfile" type="path" gui-text="Input file (OBJ/OFF/PLY/STL)" filetypes="obj,off,ply,stl" mode="file">/your/object/file.stl</param>
             <param name="max_num_faces" type="int" min="1" max="99999" gui-text="Maximum allowed faces" gui-description="If the STL file has too much detail it contains a large number of faces. This will make processing extremely slow. So we can limit it.">200</param>
             <param name="layer_height" type="float" min="0.001" max="99999.000" precision="3" gui-text="Layer height [mm]">1.000</param>
-            <param name="layer_number" type="int" min="0" max="99999" gui-text="Specific layer number" gui-description="Set to 0 to import all numbers or set a number 1+ to import a specific layer.">0</param>
+            <param name="layer_number" type="int" min="-99999" max="99999" gui-text="Specific layer number" gui-description="Set to 0 to import all numbers or set a number + or - to import a specific layer. Negative values will invert (count backwards)">0</param>
            <hbox>
                 <vbox>
                     <label appearance="header">Transforms</label>
diff --git a/extensions/fablabchemnitz/slic3r_stl_input/slic3r_stl_input.py b/extensions/fablabchemnitz/slic3r_stl_input/slic3r_stl_input.py
index 2e440049..d9ac6f81 100644
--- a/extensions/fablabchemnitz/slic3r_stl_input/slic3r_stl_input.py
+++ b/extensions/fablabchemnitz/slic3r_stl_input/slic3r_stl_input.py
@@ -168,7 +168,7 @@ class SlicerSTLInput(inkex.EffectExtension):
             '--no-gui', 
             '--scale', str(scale), 
             '--rotate-x', str(args.rx),
-            '--rotate-y', str(args.ry), 
+            '--rotate-y', str(180+args.ry), #we import the style like PrusaSlicer would import on the plate
             '--rotate', str(args.rz), 
             '--first-layer-height', '0.1mm', 
             '--export-svg', '-o', svgfile, args.inputfile]
@@ -338,11 +338,15 @@ class SlicerSTLInput(inkex.EffectExtension):
         #inkex.utils.debug("{0}: {1} polygons in {2} layers converted to paths.".format(svgfile, polygoncount, layercount))
 
         if self.options.layer_number != 0:
-            for element in doc.xpath("//svg:g", namespaces=inkex.NSS):
+            groups = doc.xpath("//svg:g", namespaces=inkex.NSS)
+            for element in groups:
             #for element in doc.getroot().iter("{http://www.w3.org/2000/svg}g"):
-                if element.get('id').split('stl-layer')[1] != str(self.options.layer_number):
-                    element.getparent().remove(element) #element.delete() does not work. why?
-
+                if self.options.layer_number > 0:
+                    if element.get('id').split('stl-layer')[1] != str(self.options.layer_number):
+                        element.getparent().remove(element) #element.delete() does not work. why?
+                else:
+                    if element.get('id').split('stl-layer')[1] != str(len(groups) + self.options.layer_number):
+                        element.getparent().remove(element) #element.delete() does not work. why?
         if layercount == 0:
             inkex.utils.debug("No layers imported. Try to lower your layer height")
             exit(1)