Hi all, recently I've been looking at the plethora of Chinese CNC routers availible on Ebay, and although many look to be a good deal, I have some concerns.
It appears that most of the frames are well built, but the guide rails on almost all of the machines are unsupported leading me to suspect severe flexing under load.

I already have a 12x12 Zentoolworks CNC that suffers from flexing guide rails, It utilizes 16mm guide rods on the X, and Y axis, which appears to be about the norm on many of the smaller machines.

So my question to you all is, if you have one of these machines do they suffer from flexing issues, or am I missing something?

Also do you know of any that are more rigid than the others?
Thank you for your time.

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