Measure the distance from the gutter to the ground and subtract 1 foot to determine how many rings and how much copper wire you'll need. Choose the size metal ring you want to use, and divide its diameter into that distance. You will need one 6-inch length of copper wire for each ring you join to another.
Cut a 6-inch piece of copper wire.
Set two metal rings next to each other and loop one end of the copper wire around both rings to hold them in place. Twist one ring so that it's at a 90-degree angle to the other.
Wind the copper wire around the loop holding the two rings together twice. Wind the rest of the wire through the two rings where they're joined. Wind the wire so it forms an attractive coil.
Continue attaching rings together this way until your chain is the desired length.
Attach a screw hook to the eave of your house where it meets where a downspout would normally be attached.
Slide one end of the chain over the screw hook. Check the distance from the end of the chain to the ground. There should be a 1-foot gap. Shorten the chain if it's too long by removing rings. Add more rings if it's too short.