There are some workarounds to this problem, but not many of them are as smooth an effortless as this one which uses erasable pen ink to add colors to the filament on the fly. Erasable pen ink is a ...

There are some workarounds to this problem, but not many of them are as smooth an effortless as this one which uses erasable pen ink to add colors to the filament on the fly. Erasable pen ink is a ...

It’s not a digital billboard. It’s something in between. Equipped with erasable markers, ­Scribit—a write-and-erase ­robot—can re-­create artwork on walls and other vertical surfaces by ...