Tips : Melted crayon

Gather up all of your broken crayons 

cut them into small pieces 
 fill the paper cup (alternative : aluminium foil) with an inch thick crayon.

use hot gun to melt the crayon 
(alternative) use oven to bake for 10mins / until the wax is melted

Allow the crayon cool and harden ... 

cut out the crayons and they're ready to use.