Copper Tape Stem
The copper tape is placed on the bottom of the stem.
Wrap the copper tape around the fold tab as shown on the picture. Leave more then enough copper tape to form a long tab as shown in the picture. The tab will allow the alligator clip to connect to button stem.
When the button cover is pressed, the bottom of the stem will make connect with the copper traces on the rest of the box.
Follow the copper trace pattern as shown in the picture. Form the "F" shape in the center of the box enclosure. Start above the box tab slots and place until you get to the middle part of the second section of the box.
Use a spudger to press the copper tape on the box enclosure.
We'll need long wires to connect the wire coils. We cut two pieces of 4 foot (1.2 meter) long wires. Fold pieces of copper tape into tabs to connect the wires to the rest of the circuit in the box.
9v battery connector
Now we'll need to connect the two 9v battery connectors together by soldering them to a female JST connector.
First fit heat shrink around each wire before soldering the wires together.
We'll connect the the two red wires to the red wire on the JST connector. Do the same with the three black wires.
Fit the heat shrink over the soldered connections and use the side of the iron to heat.
Jumper Aligator Clips
The batteries will connect to the circuit on box enclosure via alligator clips.
We'll carefully plug in the jumper to alligator clips into each JST port.
You can twist the wires to help keep them organized. You can do it by hand or use this 3d printed drill bit!
Insert the button assembly into the center slot on the box enclosure. Carefully press fit each corner at an angle to prevent the tabs from tearing.
Pass the twisted wire pair through the smaller opening on the box enclosure.
Place the two 9v batteries to one side of the enclosure. You can use foam tape to secure them to the wall.
Now we can carefully connect an alligator clip to the copper tab on the button stem and the other to the tab on the box enclosure.
Arrange the smaller tabs over the large walls of the enclosure to carefully close the box.
Test push the button to make sure the stem is not obstructed and can reach the the copper tape inside the enclosure.
The heating coil is available pre coiled but we picked up a spool and use a small screw driver to coil around and made our own.
Now we can connect the heating coil to the extension wires. To make swapping coils easier, we used short alligator clips to hold them. This works when placing the heating coil close the the fireworks fuse.
We can also use a third helping hand to easily hold the alligator clips at an angle.
Test Heat Coil
Finally we can test heat the coil. Press the button on the box enclosure. Fresh batteries should heat the coil bright yellow in about three seconds!
To add detail to ignitor, we printed these Minecraft graphics and used a glue stick to adhere to the three wall of the enclosure.
Most fountain type fireworks have their fuses above the ground. We added a fuse extension to reach the floor, were it will be close to the heating coil.