Another Utility KNife

I have a big pile of these knife blades but have lost the original Stanley knife that uses them. I have printed many utility knives designed to use the standard "Stanley Knife" blade but not very happy with them for various reasons. This is my take on it - it locks positively with the knob so I can carry it in my pocket or toolbox with out slicing myself when reaching for it.
Apart from the blade, you will need 5 small 3mm X 6 mm hex socket machine screws and 1 Hex Head 4mm X 20mm machine screw and nut.
I printed these with 50% infill and support only for the lock knob. Obviously print the blade holder standing up.