I can't cut plywood with Sculpfun S6 PRO

Hi, I have a problem I really can’t handle anymore. I bought a new Sculpfun S6 PRO laser cutter (link here). I’ve been setting it up for almost a month now, I’ve added another air assistant, but I still can’t find the optimal way to cut plywood. Below I enclose photos of cutting plywood 4 mm thick. Judge for yourself how it turned out…

Would anyone know what to do? Thank you very much.

I put here my settings from LightBurn (I admit that I don’t know much about all those numbers yet.):

Waiting for connection...
EEPROM read failed. Reset and restored to default values.
Grbl 1.1f ['$' for help]
Target buffer size found
Homing cycle is not enabled in your Grbl settings.

First side:

Other side:

Contour line setting:

inner line:

your error is the type of units you use for that engraver, you are using mm/sec that is best for CO2, you better use mm/min. In this way you are going at 900mm/min and at that speed you will never cut something… maybe paper

Change units and cut at 150 max 200 mm/min and you will see the improvement
p.s.: i think that 1 or 2 passes are enough (surely not 18)

Lightburn settings aside a 60w CO2 laser would blast thru 4mm ply. They say 60w spot compressed. Sounds like a marketing line.

I would start with 10mm softwood they say it cuts and using a 20mm square try different power settings. Then use those settings on plywood, which is harder to cut due to the glue layers.

in Sculpfun there are no specs about that module, but is only a diode of 5.5W optical output, if he think to cut 4mm plywood at 900mm/min… well… he can achieve that in 40 or 50 passes…

Thanks a lot, I’ll try it tonight and let you know. :slightly_smiling_face:

Thanks for the help. The configuration change really helped. Now I cut 3 mm plywood at a speed of 150 mm/m and 3 passes. Maybe two would be enough, but I still have to try. 4 mm plywood wants about 5 passages.
I would also like to know if there is any test that would show me at what speeds the machine will engrave and what shade. Isn’t there a palette for that? Thank you

maybe you have to adjust this test for you module but i think it will work
TEST GRID.lbrn (60.1 KB)

Perfect Roberto, its ok. Thank you for help me!

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I am facing the same problem knowing that my speed and power are more than this, I still can get the best setting to cut 3 mm plywood… I would like to ask you if you have faced a problem in engraving the shapes and words, cuz I have the same laser and whenever I start engraving or cutting something on the plywood it comes different and not accurate at all. Can you share me what steps have you followed in order to have this shape perfect as a line?

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