Most odd as my "official" micros fit fine on breadboard.
Did you solder the header pins yourself ?
I always use some old breadboard to initially line up the pins and just solder the end pins before moving to remove it and finish soldering.
pert:
If you found out that it fits and asked for the post to be deleted, why do you keep posting about it?
When I press it, it's possible to press the headers inside about 2 or 3mm. But I then saw the image on blog.arduino.cc where the headers are completely sunken in. This is not possible with my Arduino. It would surely damage the headers. So something is weird...
I am confident that, were you to hand it to me, I could pass it back to you in under 2 minute with the pins bent such they they lined up with breadboard again, but it's really hard to describe one's technique (and it's also not clear to me even exactly what the issue is)
It's pretty common to find header pin not sildered on perfectly, even on brand-name boards. The el cheapo stuff, crap soldering jobs of anything through-hole is ubiquitous. Most of the cheap stuff doesn't even come with pin header soldered to it (both because it's cheaper - through-hole requires different process than SMD - and most customers prefer it... soldering on pin header is neither particularly timeconsuming nor particularly hard, but removing pin header is a nightmare