Another simple project I did with tikercad.
It can simply double the space to store your miniatures.
I printed it over a dozen of times. Sizes are perfect for IKEA's Billy/Detolf and fit in any FDM printer.
Easy Assembly, just fit the support in the holes, no glue needed but better if use some ;)

2 versions: free and 25mm round (this way can fit 42 miniatures in its 26mm round holes)

Rods are 5cm height. You can edit this with 3d Builder to increase them... I did some 6cm and 8cm for pikemen, but it's not important, just place small minis in the lower tray and the one with bigger weapons/poses in the top one.