The patented four-nozzle print head 4Move is the cornerstone and hallmark of the Multec machinery portfolio, with its four nozzles making for extremely versatile machines, capable of combining up to four different materials - everything from elastic and high-strength media to low-friction and electrically conductive substances, to name just a few. Its integrated drip-stop system is designed to ensure a clean separation between the various materials. According to Multec, this enables users to perform multi-nozzle printing tasks without any unwanted dripping or oozing, as only the active nozzle moves into the printing position, while the others are stationed behind a cover plate. The aim is to prevent melted materials from leaking out of the inactive nozzles and onto the print object, causing flaws in the printed design.
Besides accommodating a wide range of material combinations, the Move print head also supports a variety of nozzle sizes to ensure printing times are kept to a minimum while maintaining consistently excellent surface quality. This reportedly makes it possible to print deep-drawing dies out of Multec PLA HT in next to no time. In the words of Multec, PLA HT boasts much greater temperature resistance and impact strength than standard PLA, making it ideal for all kinds of components and dies. Moreover, the integrated thermal management system eliminates the need to perform cleaning operations, which can help save additional time and materials.
Keeping a clean separation between materials is also essential when FFF-printing metals, which is why a soluble support material is required when producing complex geometries with these materials. This is another area in which Multec aims to excel with its pioneering technologies. When printing metal, the metal filament (approximately 80 percent metal powder in a binding polymer) is processed in the 3D printer like a normal plastic filament. This results in a preform that can be handled in a similar way to a MIM or PIM preform. The component is then ultimately debound and sintered at high temperatures, at which point it shrinks by up to 20 percent.