Chest in Minecraft style

This is a simple chest, size 7,5cm x 7,5cm x 7,5cm

Remark: The tolerance between the rails is 0,3mm, if anyone needs less, please let me now.

When the Cover doesn´t slight smoothly in the rails, use some sandpaper to make it work.
After sanding it should slight very easy and smooth.

UPDATE:
My son managed somehow to destroy the box by let it falling down on hard ground.
So I redisgned a little bit and make it more stable by moving the rails 1,5mm more inside.
The new stl-files are marked with "_v2".