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+# Creating your own shapes
+
+FreeCAD differentiates between tools (toolbits) and tool shapes (tool types).
+On this page, we explain how to create your own tool shapes.
+
+1. It is best to start by using an existing tool shape as a template.
+   You can download one [from this folder](../btl/resources/shapes).
+   I recommend you download both, the shape file (.fcstd) and the
+   diagram file (.svg).
+
+1. Open the shape file in FreeCAD, changing the body as you like. Some notes:
+    * Make sure your shape's zero is in the right position.
+
+    * Make sure that your sketch does not hard code the dimensions,
+      it should reference the shape attributes instead.
+
+    * You can add or remove attributes in the properties panel as needed.
+      **The names will be important later**, because you can reference them
+      from the .svg file to ensure proper labeling in the UI.
+      
+      ![Editing attributes](shape-attributes.png)
+
+1. Once done, save the file and open the diagram file using [Inkscape](https://inkscape.org/).
+
+1. Draw your tool diagram as needed. Make sure that for each of your
+   shape's attributes, there is a label in your picture.
+
+1. Now the important part: To make sure that FreeCAD shows the correct
+   abbreviation for each of your tool parameters, you need to mark each
+   label in your diagram with the name of the FreeCAD attribute.
+   
+   ![Shape labels in BTL](shape-labels.png)
+   
+   Start by clicking the label.
+
+1. Open the object properties by pressing Shift+Ctrl+o.
+
+1. In the ID field, enter the FreeCAD attribute name. However, you have
+   to translate the attribute name as follows:
+    * Before every capital letter, insert an underscore.
+    * Lowercase everything.
+    * For example, CuttingEdgeHeight in FreeCAD becomes `cutting_edge_height`
+      in Inkscape.
+      
+      ![Inkscape object properties](inkscape-properties.png)
+
+That's it. Now you can place both files in your tool library path into
+the `shapes/` subfolder. You may also consider contributing your new tool
+to BTL - just send a pull request or open an issue with the files attached.