This was designed to fit exactly into a specific drawer of an Ikea set of drawers.
The slide rails say that they are "blum" but I am not sure what style the drawers are.
I note that they could be built about 7mm wider, which means 1.75mm wider for each holder
it can be adjusted to fit another drawer, it is customizable.
This one had walls that were not vertical hence the odd cutout.
I decided to use the word "rabbit" for the piece that sticks out and slides into the slot, I think that is a cabinet term.
It can be printed in fast mode, but it will still take a number of hours for each one.
This is the perfect size to store pens and pencils. I included a 45 degree slope on the bottom to make it easy to pick up pens and pencils.