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willy After a full week-end worth of tests, here are my observations:- the dot is never a dot but a very thin and wide segment. When perfectly focused, this segment is roughly 40x200 microns.- this thin beam is very well suited to cutting wood. I can cut 5mm plywood in 2-3 passes at a feed rate of 240 mm/mn, which is impressive.- cutting acrylic is OK as well, though not as impressive, as the eleksmaker 2.5W module does almost as well. The difference is that acrylic melts instead of burning like wood, and if it melts along too thin a line, it resolders to itself.However this thin large beam is not suited at all to printing raster images: as it's impossible to get a thin square dot, it's blury in one direction and leaves intact quite a part of the material in the other direction. One work around consists in defocusing it, but then when the dot is almost the same in both directions, it's blury and quite large (I couldn't get less than 0.2x0.2mm), and not precise at all. Also the adjustment is so much different from cutting that you cannot imagine doing a first engraving pass and a second cutting pass as it requires to readjust the focus.Another issue with this beam configuration is that I couldn't manage to make a PCB yet: if the beam is perfectly focused, vertical lines are chopped by the wide beam and horizontal stripes appear. If it's unfocused to look like a dot, it's unusable for thin tracks that the eleksmaker module does without problems.In the end I'll keep it only for cutting wood, and will continue to use the NUB0E for engraving and PCBs. Then I'll fall back to the 2.5W Eleksmaker when I need to both engrave and cut the same piece.One last point is that it's particularly difficult to focus, it should really be sold with pre-calibrated wedges to ease this task so that the user avoids touching the focus adjustment.It remains a good product but definitely not a general purpose one that could replace another module, it's only a complement.

willy 30/01/2021
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