I am building the mini-cnc mod with the contrapteur scheme and want to show you some pics of the actual building state. I would call it pre alpha, because it needs a lot of tweaking and is not entirely finished BUT it moves really smooth (way better than expected) if you turn the spindles :D
The basic concept is as said before the mini-cnc converted to metric 20mm grid (instead of 25 like the genuine metric converion; forum search contrapteur).
During the building process i encountered some difficulties getting all the required materials, so I took what I could get and then went on improvising.
That meant a lot of trial and error and restructurizing the original plan and took me some times to the edge, but I am kind of proud to have managed it to this build stage.
The electronics are in the workings.
Motor: 3x NEMA 23 stepper (1NM, 2,0A, bipolar, 200 steps) Driver: 3x Pololu a4988 Controller: Arduino UNO
I know, it doesn't look that good,but with my skills its ok for me ;)