Hi,
As I said before, these Chinese CNC mills are toys. Great to learn, do some experiments and if you like to use them to keep busy improving them as a hobby, that's fine.
Just to put this in a different light: some cutting tools cost MORE than the whole Chinese CNC mill!
It doesn't matter if you just want to cut plastic, wood or other "soft" materials: you will still need positional tolerance and repeatability.
Take a look at these Roland CNC machines:
https://www.rolanddga.com/products/3dThey are certainly more expensive, but still cheap, compared to a "real" CNC machine. I see them often in educational facilities and small companies that make components to produce fashion items (belts, shoe components, etc.), where "soft" materials can be used and precision is not so important.
The next step in quality is to invest in a Haas CNC machine:
https://www.haascnc.com/index.htmlThey basically represent the low cost CNC mills. Mass-produced in series (as opposed to individual fabrication on most competitors), they are cheap and, well, not so good, when compared to DMG, FPT, IMSA, Mikron, just to name a few.
Pricewise and speaking out of my head, the numbers are vaguely:
Chinese eBay CNC: 150-500 Euro
Roland: 5000 Euro
Cheap router from small but reputable manufacturer: 10.000-40.000 Euro, depending on size and spindle and accessories like automatic tool change
Second hand mills: 20.000-500.000 Euro, depending on age of the machine, controller, state of the machine, size, number of axis, accessories, etc.
Haas CNC: 40.000 Euro (VF-1)
Regular high-quality CNC: 100.000-1.000.000 Euro (or more)
Hope this puts your quest into perspective!
Finally, bear in mind that you need a CAM software for 2D, 2.5D and 3D programming. While simple 2D and cycles can normally be programmed on the controller, any 3D CAD file will need to be programmed in a CAM software.
While there are some almost free options (take a look at Autodesk range of products like Fusion with HSM, ArtCAM and PowerMILL), you will need to have a matching post-processor. This can be from easy to configure yourself to extremely complex requiring the service of a professional CAM supplier. Note that many of the Chinese sellers include a CD with cracked software - normally ArtCAM. Used to belong to Delcam, was bought by Autodesk 3 years ago. This could mean legal issues.
Regards,
Vitor