Reports that other planets may support life always refer to the presence of liquid water. What is almost never mentioned is whether these planets have a strong magnetic field protecting them. This is one of the key reasons why Earth has an atmosphere and Mars doesn’t. This feature is important and simple bar magnets can demonstrate the nature of the Earth’s magnetic field.
We supply neodymium magnets for a broad range of applications. One of the more interesting uses was by Dave Durand of ETATech3D in Brantford, Ontario (1 hour west of Toronto). He used some of our disc magnets in a product he designed and 3D printed for one of his customers. We greatly appreciate his permitting us use of his images and description of the process verbatim as described below.