These stackable filing trays share quite some principles from the Compartment Storage Box. The assembly relies entirely on a glue and screw free press fit principle and – pretty obvious – the same material from closet back planes. Furthermore I added the same tappets with corresponding recess for stackability. A few kerfs help to bend the bottom a little.
I used a desktop cnc-machine by Stepcraft, but the design could be done with a laser as well.
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Keep in mind that the stl was uploaded just for a three dimensional display here on Thingiverse.