Nov 20, 2018 | By Cameron
Many new 3D printers were showing off their capabilities, whether big or fast, at Formnext in Germany over the weekend. Italian company Sisma couldn’t be left out, so they also launched the EVERES ZERO and UNO DLP 3D printers at the event. DLP (Digital Light Projection) technology is used in SLA (stereolithography) 3D printers in order to cure an entire layer all at once rather than tracing the layer with a laser, greatly increasing the speed of production while also removing the moving mirror parts needed to direct the laser beam.
The Sisma 3D printers include some innovative and patent pending upgrades, such as ZTT (Zero Tilting Technology) that separates the part from the bottom of the vat between layers without tilting the vat like most SLA 3D printers. This method reduces mechanical strain on the part during the printing process. Additionally, the bottom of the vat is PTFE, an inert material that prevents parts from sticking to the vat; Sisma claims the vat doesn’t deteriorate with use, an impressive achievement. These features increase the dimensional accuracy of parts to the level necessary for the sectors targeted by Sisma, which include jewelry, dental, and industrial prototyping.
To reduce the fail rate that troubles many SLA 3D printers, Sisma incorporated as much automation as possible into the machine as it’s usually the human element that causes print failures. An especially bothersome and messy reality of working with SLA 3D printers is handling the often caustic resins. As such, one automated element is the SBP (Smart Building Platform) that aligns and zeroes itself for each print, and the part is also automatically detached when finished to remove the risk of breaking a brand new part when getting it out of the 3D printer. Resin cartridges are identified by the 3D printer via RFID tags, and the resin is loaded/unloaded by the software before and after prints.
Sisma offers several resins catered for different applications, such as SPRITZ ABS that’s optimized to meet the precision and durability requirements of prototyping and jig making.
DENTAL MODEL is ideal, obviously, for producing dental molds that are opaque for scanning as well as strong and thermally-resistant for vacuum forming.
For the direct casting of jewelry, GREEN CAST offers excellent burn-out performance with low thermal expansion.
When prototyping parts that need to be extra hard and machinable, there’s GREY MASTER.
RESIN ONE is a general use resin for producing models that need to look good. It experiences minimal volumetric shrinkage and has “self-hiding” capabilities that increase surface quality.
The ZERO and UNO have similar specs, with the UNO sporting a larger build volume of 125x70x200mm, compared to 96x54x200mm for the ZERO. But the ZERO does have a better XY pixel resolution of 50 microns, versus 65 microns on the UNO. They both use a 1920x1080 projector powered by a 405nm UV LED and can print up to a vertical centimeter every six minutes, meaning it would take about 45 minutes to 3D print an object the size of a baseball.
Posted in 3D Printer
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