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i also have a extractor on the bottom(strong suction) but still i get smoke on top how would i avoid this smoke on top spreading both side of cut hole?

ok so with the perfect focus makes a perfect track, but still about the smoke, i still havent got a way to make it disapper, tried with airpressure and so on, only on the lowest airpressure(0.1bar)...

I dont know the exact height, but when i tested this: focusing point was below the cutted part(this is only waht i think?) there was less smoke on the cut rail, and it was spreaded smooth and not so...

does this mean the focusing point ? my focus is now about in the meiddle of the piece? should it be under or top to get smokeless cut?

so i have suction below the plate, and there is too some smogas(on the edges) should there be somekind of protective gas?
and the top smoke, i use air with minimum pressure theres is not so much...

thx for the fast reply, some questions though...
what do you mean about the gas? protective or something?should it be focused below the acrylic to the cutting point ?

i dont want to flame it i...

some questions on cutting acrylic, what do i need to get qood quality for my system?

there are two following problems:
smoke gas what is the best way to prevent this?(it spreads on the top of...