Virtual M4 thread cutter

I made this to simplify CAD creation of M4 Threads. Just subtract this cutter from your solid to have a thread. It is not a real world cutter.

It initially based on the appropriate standard but I had to increase the inner diameter to be able to screw in a screw without excessive force. It works well with a 0.2mm layer height.

Just test it for yourself with a small cube as basis for subtraction. Hope it'll help you with your designs.

I used it for http://www.thingiverse.com/thing:1279978.