Still all grade 1. We have currently put ~21,000 rolls into Mel Brandon's engines blueprint, which might be about half of what's required. We also put about 4,500 into pulse lasers while testing a theory, and another group has put at least 4,000 into armour.
The biggest thing slowing our attempts down is that you can only do one roll at a time, and the animation takes ~4 seconds. Absolutely fine for personal use ... really inconvenient if you need to give an engineer 900 G1 materials so you can go off and get some more.