How to accurately recreate a circular design for 3D print? I know there is an easy way to build this but I can not figure out how. Can anyone walk me through the steps to build the following figure easily? I need to basically have a 1/8&quot; circle with 1/8&quot; straight pieces extruding out every 45 degrees.
Blender was never meant for precision work. 
One way to get similar results is to use arrays. 

Start with proper sized small segments. Add curve + array modifier arround its circle part, 

For circumference extrusions it's similar. Use 'object offset' setting in an array modifier. 

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