Mix in enough semolina to make a not-too-dry, not-to-sticky dough.
A different recipe: One large whole egg per person, broken into a large bowl. Mix in enough whole wheat flour to make a paste. (I mix with my hands, wearing food-handler gloves.) Mix in enough semolina to make a not-too-dry, not-to-sticky dough. Since I usually am making only for 2, I turn my food handler glove inside out to cover over the dough ball, and let that rest 30-60 or more minutes. Then roll out with my (30+ year old) pasta maker. Fettuccini noodles cook in about 3 1/2 minutes.