Why buy a carrier block for $28 that will work when you can print your own.... for much more money! I've been riding with my first printing of this block for about 4 months now and no major problems. The only thing is that sometimes the bag gets stuck a bit when you're pulling it off. I have to tweak the little trigger part. In the mean time, you can shave off 1mm of material from the triangular edge of the clip. That should do it.... Or you could just buy the original Brompton part for $28. But seriously:
Do not use this on your bike - please. It's just going to break. Use it for a paper weight or install it on the Brompton you hang on your wall as an art piece. If you try to use this instead of the standard carrier block it will fail and you could get hurt. So don't do that.