Do you have a broken or retired multirotor or quadcopter? Here is an easy way to bring it back to life DIY style!

Step 1: Parts and Tools

You will need
4x motors that will not draw too much current, like 5mm ones
An FC board to control it
Props to fit the motors
Some small gauge wire, I.E. a paper clip
A 2.5x2.5 square of 1/8in balsa sheet
Tools
Solder and soldering iron
Hot glue gun and glue to fit
Needle nose pliers
X-acto knife or boxcutter
Helping hands

Gather these up and you are ready to start!

Step 2: Solder and Put Together

Solder on the motors in the correct way.
Red and white are +
Black and blue are -

Also solder on the battery.
Red is +
Black is -

Take the balsa square and center the frame on it. Then, draw where the edges are and cut them out. But, be careful to leave the corners on. Next, glue the board face-down leaving a small space for the battery charge port.
Measure where the motors will go, and it should be right off the frame. Cut the extra bit off and fit the motor. Next, glue it on. You can use CA or hot glue.
Be sure to secure the battery before you fly or test.

Step 3: Test and Fly!

Put the props on, making sure they are on right. Then test it to see if it is working. Charge it up, and you are good to go!
I am not liable for and injuries caused by this quadcopter. Please be safe and responsible. Happy flying!