Battery adapter from AAA to AA

Who does not know: You need right now a AA battery, but has just the size AAA at hand?! For exactly this case I have constructed this adapter. Just snap in a AAA battery, stuff the upper compartment (positive pole) with aluminum foil and you have a perfectly working AA battery!
Making up with the aluminum foil: Roll up a piece of aluminum foil and stuff it through the front hole. Then twist the foil further and press it simultaneously into the compartment. Finally, cut off the foil so that a positive pole of about 2 mm still sticks out.
When printing, you'll need to orient the model so that the opening is vertically up. You will then need support only on the print bed.
Have fun with it!