We’ve seen some interesting innovations with filament holders before, like this entirely 3D printed filament holder, but a mini spool for a 3D pen is definitely a new one.

Thus, [3D Sanago] used foam boards to cover much of the chassis. The build recreates the kart from the KartRider Rush+ game. The first ... 3D trusses using the 3D pen. The trusses are then mounted ...