Tried: Prusa SL1S Speed ​​Resin 3D Printer

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With the Speed ​​SL1S hat Prusa Research the revised version of its first resin 3D printer SL1 put on the market and the predecessor removed from the line. The manufacturer sent a test device to Make; We left the video camera running when we unpacked it and put it into use for the first time.

As can be seen in the video, the direct comparison of the new machine with its predecessor initially puzzled us, since the two hardly differ from the outside, but the new one is supposed to have an installation space of 25 % bigger. However, the increase is completely hidden in the slightly larger base area of ​​the display and print table (now 127mm × 80mm instead of 120mm × 68mm previously), the maximum model height of 150 mm remained.

Unfortunately, the fact that the maximum high pressures are still not in the post-curing and washing machine (in itself very convenient) remained CW1S which can also be purchased – this is the end of the model at around 130mm in height.


Make’s editorial team tries more than fits in the bi-monthly magazine. That is why we successively publish other test reports on our website.


The collective term 3D printing today refers to a set of manufacturing techniques that work on different principles and are only suitable for very specific materials. Their common denominator: All processes build three-dimensional objects by applying and solidifying matter in thin layers.

  • This is how 3D printers work

  • More information on 3D printers


There’s more on the subject in issue 6/21 of Make.

Convincing, however, is the speed the new printer already leads in the name. Thanks to the monochrome LCD display for exposure (on which the manufacturer gives a guarantee of 2000 hours), the curing per layer is significantly shorter than before, so that the printing time of comparable objects is longer than halved compared to the predecessor, with the same quality. With a 15cm high tower made of thin 0.5mm layers, the SL1S Speed ​​​​​​is ready after 3 hours and 48 minutes, the SL1 needed another 10 hours and 28 minutes.

The comparison is even more striking Original_prusa_sl1s_calibration_test_object, which is delivered as a ready-to-use 3D print file on the device memory. For the first printer test it is prepared with a layer thickness of 0.05 mm and is ready after just under an hour.

For this test model (which consists of a 3D caricature of corporate boss Joe Prusa, standing on a honeycomb-shaped console) there is a ready-to-use print file in the printer’s local memory…

If you leave same model in same size for FDM printer Prusa Mini Slicing from the same company would take nearly an hour and a half, but only with four times the 0.2mm layer thickness and if you choose a speed-optimized pressure profile. FDM printing with 0.05mm thick layers would even take 8 hours – this way the days of FDM printers bypassing any resin device are definitely over. Today the race is going differently…

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From Prusa SL1 Speed convinces with the speed and print quality as well as the details of the construction, the equipment (spare sheets for the resin basin are included) and the processing quality, there is no doubt. With 1979 euros (2549 euros with the washing machine CW1S) the printer costs almost a factor of 10 more than a device like this Creality Halot Onewhich even achieves a similar print speed with nearly the same installation space.

Of course, we cannot report any long-term experiences at this point, the device is too new for that and in our Make editorial team there is no 3D printer in continuous use similar to that of industry or an open workshop. So we can only say that the Prusa SL1 Speed works like thisas if you were going to enjoy the device for a long time, which could put the high price into perspective. Previous positive experiences with Prusa products confirm this impression in any case.

  • To learn more about resin 3D printers, in which liquid synthetic resin is hardened by targeted exposure, see our online article Stereolithography 3D Printing.


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