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Sorry I so late to this.

The 3018, no matter the version, is not a very sturdy CNC router. The spindle is pretty wimpy and the mechanism has a fair amount of flex. If you are only going to cut CF, it might be ok but I keep finding things to use my CNC router for, including metal (al, copper). Just keep that in mind. Also, the 300x180mm work area is actually smaller than that. You will need to have room for hold downs which further constrain your working area. My first CNC router was 300x300mm and I outgrew that real fast. I bought a 3018 from a frustrated user for $100 and was shocked at how much flex it has (I use it for a diode laser). Currently I run a 48"x48" Avid Pro and even that cramps my style. Personally, I would recommend something in the 500mmx500mm bed range for a starter. Frankly, I see two outcomes from buying a 3018: either you like CNCing and upgrade to something better and the 3018 sits unused. Or, you get frustrated with the limitations and hate CNCing so it sits unused. Either way, the outcome seems the same.

A CNC machine is pretty simple so if you have used other machine tools, you should be fine. The computer adds a bit of a twist but it's not that complex.

Probably the biggest issue I see is the dust from CF. It is nasty stuff - a known carcinogen, not just to the state of California... And the tiny CF dust particles linger. I suggest you think about investing in good dust extraction. Maybe even with a HEPA filter. The 3018 may not be convenient for adding a dust boot for the spindle so consider that before buying.
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