A great concept: get kids building with cardboard – safely and creatively – using the Makedo Discover kit. It includes 123 pieces (tools + connectors) for crafting castles, creatures, and whatever else their imagination comes up with. Great for classrooms or busy households.
Comes highly recommended from a friend.
Larger and smaller kits also available.
You can pretty much 3D print all of the tools & accessories
And if you are looking at these Makedo kits, you may be interested in picking up a 3D printer like the Bambu Labs currently on sale to do a whole heap of a lot more arts & craft projects.
Even not for cardboard craft, this perforation tool makes recycling boxes much easier without using stanley knives