Josef Prusa has recently launched a new resin-based open source SLA 3D printer Prusa SL1. The RepRap designs of Josef are acknowledged as a reference in the 3D printing community. As an example, hundreds of companies have copied the design of the Prusa Mk3/i3 3D printer which is also one of the most 3D printer sold in the community.

Furthermore, at the beginning of this year, the company acquired Futur3D, a Czech 3D printer company that specializes in resin printing. Its aim is to open source all the designs of resin-based 3D printers starting with SL1.


The new 3D printer integrates MSLA. An LED array is used as a light source with an LCD photomask to shape the light image. Jut like DLP printers, the LCD photomask has square pixels. However, Josef explained that the pixel size depends on the way the LCD photomask has been fabricated. Furthermore, each of these pixels is deactivated on the LCD to enable the LED light to pass through in order to form the layer. Thus, the XY accuracy is fixed and it does not depend on the way the user zooms or scales the lens.

The SL1 is using a 5.5’’ high-resolution LCD display with the physical resolution of 2560×1440p, resulting in 0.047mm per pixel, that’s the fixed XY resolution. A high-performance UV light will cure one layer at a time, which takes about 6 seconds and then the printing platform is lifted, so the printer can start creating another layer. This configuration gives us a maximum print area size of 120 × 68 × 150 mm (or 4.7 × 2.6 × 5.9 in.).

By the way, we are using a pretty smart design for the printer: its core is a rigid dural frame with a separate body, which greatly improves stability and reliability. To put it simply, it’s not another wobbly plastic thing. This thing is HEAVY! 

As already mentioned, thanks to Trinamic drivers and rigid dural frame, the SL1 can reach a layer height of just 0.01 mm. But most users should stay within the recommended range of 0.025 – 0.1 mm per layer. And yes, we will also give you the option to enable variable layer height. And rest assured that our printer is open to third-party resins.

The company keeps building its 3D printing world in silence, while significantly marking souls.


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