Shed Door Open Holder

This device goes between the padlock hasp slot and the hasp loop so to keep the door slightly open. It's open enough to let ventilation air in but not enough to let the cat in where it might otherwise hide and get trapped unknowingly. My hasps are the 5" size. The OpenSCAD file can be modified to make adjustments.
I have my 3D printer in this shed and it gets super hot. The shed has a low vent and a high one but the additional cross sectional area and air breeze now and then helps to keep the temperature lower than if the door were completely closed.
To use it, place through the slot and raise up the hook end. Get the two hasp parts in proximity and then momentarily raise the hook to blip it over and snap onto the hasp loop. Reverse to disengage.