I needed a pull saw to cut the tabs clean that my Maslow CNC generated and I wanted something more substantial than a hack saw blade. This uses any "Sawzall" type blade so you can use any length or type that fits that type of saw. The internal space fits the tang and saw profile for support so the thumb depression is "up" and the saw blade only fits that way. You may need to clean out the slot depending on how clean your printer prints. Be careful inserting the blade and be sure it's in far enough to secure the blade with the small bolt. I found tapping the handle base on the floor worked well to "seat" the blade. FYI: I designed the blade end profile first then just subtracted that (difference) from the body.