Impossible Dovetail Box

I saw some dovetail boxes out there so I decided to make my own version from scratch for a relative's gift. I made it to be pretty tight, but after a few slides it becomes way easier to open, but it will not open accidentally. It's 80x80x30mm. Mine one has my relative's name "engraved" on top part, and filled with printed letters which are glued with CA glue.

In case you want to put someone's name on it, I'd recommend using an offset of 0.3mm around the letters for their "pockets" (e.g., cap