This is easy and will save on dryer sheets.
Use 100% wool and start rolling them into a ball…. Start by making a few knots on the same spot.
Then roll over it and over it, at different angles, until it forms a ball.
Makes the ball as large or small as you want. Mine were palm sized. To the off, make multiple knots in multiple places and tuck them inside the ball. Then add a few drops of essential oil like lavender or lemon and toss in your dryer. Each lasts me a few months before I need to add a but more oil and I haven’t had one die on me yet.
One roll of wool made me 4 palm sized dryer balls.