Why this recipe is thicker on purpose
A wide ribbon has more surface area per gram than a narrow one, so it picks up more sauce. It also has more unsupported span, so it sags. Stopping the roller at 1.6 mm instead of 1.2 mm gives the ribbon a spine: the centre stays firm while the surface softens and grips.
Cut thinner and the pappardelle turns into a wet rag in the bottom of the bowl within two minutes of saucing. That is the single most common failure with wide ribbons.
The blend and why it matters here
Semolina at 30% raises the average W from 180 to about 205. That extra strength is what lets you rest this dough for 40 minutes — longer than any 00 dough would tolerate without going slack — and then roll it wide without a tear at the edge.
Mix the two flours dry, with your hand, for a full 30 seconds before the eggs go in. Uneven blending shows up later as pale streaks in the sheet and as one edge that rolls thinner than the other.
Rolling, dusting and the width cut
1 - 2 - 3 - 4 - 5 - 6, dusting with semolina at every other pass only. Over-dusting is a real problem with a wide sheet: the excess flour ends up in the sauce and gives it a raw, chalky edge.
Cut at 13 mm. The cutter on most home machines tops out around 6.5 mm, so use a knife and a ruler: lay the sheet on the board, trim the ends square, then cut strips at 13 mm with a single firm stroke. A sawing motion frays the edge.
Cooking a thick wide ribbon
Thirteen millimetres at 1.6 mm takes 4 to 4.5 minutes, longer than tagliatelle. Pull it 45 seconds early and finish it in the ragù with a full ladle of pasta water — a wide ribbon needs more liquid in the pan than a narrow one because more of it is out of the sauce at any moment.
Serve in warm shallow bowls, not deep ones. Pappardelle piled in a deep bowl steams itself and the ribbons weld together.