For people with lots of old safety razor blades lying around. The nut screws on over the top piece, to hold the blade on. The cap clips over the blade.
(The long version is good for cleaning aquariums.)
Length: 5.25 inches (short), 9.75 inches (long), 3.875 inches (very short)
Width: 2 inches
Used a 0.4mm nozzle with 0.16mm layers.
I suggest using solid infill for areas less than 70mm^2. (This reinforces the screw.) In Cura, the setting is "Minimum Infill Area".