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I plan to buy a cheap or even second-hand Chinese 3020 or 3040 CNC mill so I looked around to find a way to improve it with parts I already have like Arduino or some simple electronic upgrades. I found two interesting guides:Upgrading 3020 (and other models) with Arduino, GRBL and CNC Shield V3
Detailed guide by EricAusome can be found at:
http://www.instructables.com/id/3020-CNC-Arduino-GRBL-CNC-Shield-V3/?ALLSTEPS
John Lauer hacked his 3040 to run with ChiliPeppr and TinyG.
Source: http://hackaday.com/2015/09/08/how-to-upgrade-a-chinese-cnc-machine/
This post will serve as my knowledge base and will be expanded as I gather more CNC hacks.
