The Form 2 is an SLA printer, which means it prints by firing an ultraviolet (UV) laser into a thin layer of liquid resin between the print head and the bottom of the print tray. Once hit by the UV light, the resin solidifies. By tracing a pattern with the laser, the printer creates a solid layer. When the layer is complete, the print bed slides sideways and the print head lifts, taking the solid layer with it and letting in more resin. The print head then lowers to make another liquid layer, and the laser fires again. This process repeats to form the 3D model, layer by layer.
That is the same process that was used on the previously reviewed Form 1+, but there have been lots of improvements in how this process works. First, the print area on the Form 2 has increased to 224 cubic inches, measuring 5.7 x 5.7 × 6.9 inches. That’s up from 156 cubic inches on the Form 1+. Second, the ultraviolet (UV) laser that solidifies the resin is bigger as well, doubling the power to 250 mW.
A new mechanism in the Form 2 also deals with the tricky business of lifting the solid layer and making sure that no gunk or air bubbles interfere with the liquid resin. The Form 1+ did this by tilting the print tray to peel the printed layer off the bottom of the print bed, but the Form 2 slides the print tray as it lifts the print head, then uses a wiper to clear any bits and bubbles away before the print head is lowered again.