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The hotend is, together with the extruder, one of the most important parts of a FFF 3D printer. Although at first glance it may appear to be one of the simplest elements, it is one of the most complex, as it has to achieve optimum thermal performance.
SLS (Selective Laser Sintering) technology uses powder as the printing material. The powder is spread in thin layers and the laser selectively "burns" the design into the layers. Some of the advantages offered by this 3D printing technology are high precision, isotropy of the prints, no need for supports, a great finish and a wide range of materials available for SLS 3D printing.
In order to break the barrier to its application in industrial manufacturing, resin 3D printing has had overcome various limitations, such as scarcity of materials or slow printing speeds. Nexa3D excels in both aspects with the ultrafast open-materials XiP desktop 3D printer and an ample portfolio of professional 3D printing resins.
The final quality of the printed parts is strongly influenced by the quality of the raw material used in the production of the filament, as well as by its conservation. This is because the more homogeneous and constant the filament properties are, the more uniform the extrusion will be and the better surface quality the final part will have.
SLS 3D prints do not require fillers or supports. However, the heat build-up inside large parts can cause drastic shrinkage during cooling. Therefore, SLS prints are very often printed hollow, where the wall thickness of the part will define its strength. If a hollow part does not meet the mechanical requirements, a filler can be added to an SLS part at the design stage.
To ensure optimum performance of Sinterit printers, the protective glass of the laser and pyrometer, the recoater guide, the linear bearing and the space under the cylinders must be cleaned regularly. It is also crucial to replace the short infrared heater and the short recoater cord on a regular basis, as well as the insulation of the printing and feeding bases.
There are three basic rules for the correct storage of SLS powder. Firstly, contamination of the powder and the feed and print beds with other powders must be avoided. Secondly, SLS powder must be kept in dry conditions and dried immediately if it absorbs moisture. Finally, SLS powder must be "refreshed" from time to time, especially with long printing sessions.