Travis Mitchell Innovates Metal 3D Printing with DIY SLM Technology

A New Approach to Metal Printing

3D printing in metals has been a challenging dream for many technology enthusiasts, but now, engineer Travis Mitchell has demonstrated its feasibility with a DIY Selective Laser Melting (SLM) printer. Although the construction process posed several challenges, the end results are promising.

The heart of this printer is a 500 Watt fiber laser and a galvo scanning head, which together account for most of the costs. The printing chamber needs to be purged of oxygen with protective gas, so Travis reduced its volume to decrease the amount of argon required.

Using a set of repurposed industrial servo motors, the printer operates quickly and efficiently, raising and lowering the piston that forms the building plate and the powder distributor. However, one of the greatest challenges was ensuring proper adhesion of the first layer, as excessive power could melt the powder, while insufficient power could lead to incomplete fusion.

Recoating blades underwent significant modifications, initially made from printed plastic, but later replaced with a stainless steel blade for more consistent performance. Although the final results look good, Travis emphasizes that there is still room for improvement in the project.

This printer joins a small selection of DIY SLM machines, though there are many other innovative ideas for home metal printers, ranging from electrochemical ones to those that utilize precise powder placement.