While Forker45's Clip-On Tool Caddy for Ikea Lack Enclosure fits all of the original tool needs, it was still missing the one tool I use the most… a filament cutting tool. So I did a quick modification in tinkercad and here we are.
The opening dimensions are 50mm x 38mm.
Printed in PLA but PETG would work as well, if that's your thing.
The author remixed this model.