This new feature is essentially a software change. We’re told the spot can be as much as 50% larger.
This causes the laser spot to either grow or shrink slightly. Using the same cartesian approach, they can now raise and lower the laser slightly using the already-present Z-axis motion system. Until now! Xact Metal has devised an intriguing solution to the issue. But while it’s less expensive, it’s also a lot slower than a galvo system. Meanwhile, Xact Metal does not use a “galvo” mechanism in their equipment instead the laser is simply fired at a fixed mirror that moves about with a standard (and inexpensive) cartesian motion system. However, they do operate quite rapidly, as a slight twist of the mirror’s angle can instantly sweep the laser to any portion of the print surface. The second problem is that galvanometric systems are relatively expensive. We explained this effect in our story “ Why Are Metal 3D Printers So Tall” last year. This can cause strange print quality aberrations on the periphery of the print surface, and sometimes leads manufacturers to mount the mirror very high to minimize this effect. First, as the beam is angled, the laser spot is no longer round it’s an ellipse. However, there are two challenges with this approach. The beam is then directed to areas of the powder bed for sintering. Most metal 3D printers use a galvanometric system in which a powerful laser beam hits a tilting mirror. The cost savings change is I think the most interesting new feature from Xact Metal, but I need to explain a bit of background first. If not, an email alarm is sent to the operator, who can then choose to stop the print if necessary to save on the expensive metal powder material that would otherwise be wasted on a failed print. These are instantly analyzed to ensure they match what was expected. Here’s how it works: after each layer is printed, an onboard camera takes a picture of the new layer’s outcome. That will certainly be a welcome feature.Īnother feature that’s been appearing on several machines we’ve seen lately and now also on the Xact Metal equipment is an image-based print quality control system. This helps avoid situations where a 3D print operator must pause the print and change print parameters in the middle of the night. Adaptive ChargeĪnother new feature is something they call “adaptive charge”, which is a way of dynamically managing the recoating process, where each new layer of the 3D print job lays down a fresh layer of powder. The new purge system can evacuate air at a rate 2-3X faster than their previous system, making the machine ready for 3D printing a lot quicker. One is a “fast purge”, which is a method of purging oxygen from the build chamber before 3D printing can commence. The operational simplification manifests as several new features in their equipment. They seem to have two goals in mind: simplifying operations and reducing cost. It’s hard for any player to keep up, but Xact Metal has been working on some interesting new features in their equipment that should keep them at top of mind. Today they offer three different machines, the XM200C, XM200S and XM300C. Now, a few years later, the competition is tough in the metal 3D printing market, with new entrants, technologies and geographies involved.
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