The first time I made these anemometers was when I was teaching sixth grade and the instructions said to tape the cups to the straw. That was a disaster and I was running around like a mad woman with the only stapler I had trying to quickly staple 96 cups to straws. Oh the memories :) I wised up when I moved to fourth grade. What I do now is pre -staple everything. If I was a rich teacher with unlimited resources and time I would purchase 24 staplers and let the kids make these from scratch but the reality is I don't. NOTE - Try to find straws that aren't flexible. You can use the flexible straws but the cup tends to drag those down. Look for supplies at The Dollar Store, Dollar General, or Big Lots to save money. I usually pre -staple at home, while watching tv , with a large trash bag next to me, as I finish a set I put it in the bag. Last year I had to make well over 80 (I got very good at it). NOTE - Make about 15-20 more then you actually need. Sometimes the staples come