Quote Originally Posted by m_c View Post
You could make your own drag knife, although if you're wanting to cut thick card, a tangential knife setup would work better although is good bit more complex.
M for drag knife to work as good as it does in the video the knife has to do litle U turns at each corner to orientate the blade. If you check out the site or do a search there is the Code which does this for you and alters the G-code file.

They do work without it but no where near as good as it looks in the video. Tangential Knife is best option but defeats the Cheap requirement.!!