Hinge works by just using a piece of filament.
I print with print width manual set to .3 mm and layer height about 1.6mm
Make sure you print the lids with the lettering down on the bed.
I have also uploaded two other files that have an easy open rotating button. The opener is a button on the bottom that rotates and pops them open individually. After the first press on the button from the button it should be loose and rotate.
I have also added a 2 weekly box now, can obviously print the lids, different colours for the days or weeks.