So I’ve had some great success with printing in 1.75mm (Inland from MicroCenter) on my Mini. By success I mean it hasn’t been jamming, it finishes prints, etc. etc.
For example, here’s a nice big print it did: http://www.thingiverse.com/make:266145
I was able to do this by printing this awesome little 2-minute part: http://www.thingiverse.com/thing:1673712
Here’s my issue though… it doesn’t seem to want to print very accurately, especially on smaller parts. As you can see here it has a fairly regular fluctuation in diameter of, what’s supposed to be, a solid shaft here:
The weird part though is the larger things get, the less of an issue this is. This is actually two pieces mated together. The large-diameter (1.6") lower part has a perfectly fine edge. The hexagonal mated sections had a .005" offset and mate perfectly (about as close as I’ve gotten tolerances in 3mm too). However, once we get down to the 1/2" diameter section below the hex-drive column it starts to get a little uneven, and then obviously really bad, as you can see, in the hex-drive section (9/32" widest part of hexagon).