There are several versions of Tactix Organisers - this is for the 320mm double sided storage box. It can be identified by the 3 rows of 5 compartments, plus two extras either side of the handle.

They currently only fit the centre 6 compartments that are all the same size, because I'm too lazy to do the rest. There is a x1, x2 and x4 vesion. The x4 can be quite tight for large fingers to get in, but all have a curve at the front to make retrieval easier.

I printed with mouse ears because I found sometimes the corners lost adhesion.