Just a different version of my fidget cube, but this one made up of hollow cubes.
Original is here.
You'll need to print 4 of each cube and 8 connectors.
CONNECTOR2-STL is a little smaller in outer dimensions than CONNECTOR1-STL. May make assembly slightly easier.
Getting filament to insert into hole can be tricky. It helps to ream the holes out with a drill or other small instrument. If the filament won't go into the holes separately, you'll never get it to go all the way through an assembled joint. So ream out each hole until the filament with go through each part, then assemble.
A 1.5mm hex key works nicely to get the holes aligned before trying to insert the filament.
Sample part is made from Inland natural color PLA and AIO Robotics Red PLA. Printed in .2mm layer height on my Ender 3.
I uploaded a matching stand. https://www.thingiverse.com/thing:3581730