I created these below and are added out of respect for the make remix but are on my makes as well…
There is an insert cover for LR41s, It keeps batteries from coming out of slots.
There is a snap in place cover which holds batteries tightly.
AltoidSmall_6mm_LR43s_Insert
AltoidSmall_3mm_halfcover
The author remixed this model.
Remix. Thanks for the perfect fit!
Made holder for LR43 and LR41 coin batteries.
Snap fit cover for AltoidsSmalls tin cover fits insert cover (keeps batteries from metal contact of tin) created by isailing
Slot in top to pry off with fingernail, screwdriver or $.25c piece or whatever… not too tight but just right.
.step file included for cover if want to resize for large. See my make of cover.
Remix from https://www.printables.com/model/554493-altoids-smalls-universal-insert
UPDATE:
Added additional coin battery inserts such as thicker LR44s and LR754s (small thick 5mm) or use for other sizes if they fit.