10 DIY Inventions from Scratch: From Pencil Crossbow to Iron Man Shooter

Ready to turn everyday household items into amazing DIY inventions? From a simple pencil crossbow to an Iron Man-inspired shooter, this guide walks you through 10 progressively challenging builds. Each project uses common materials you probably already have at home.

• Pencils
• Rubber bands
• Tape (duct tape, masking tape)
• Binder clips
• Popsicle sticks
• Bottle caps
• Matches and matchboxes
• Aluminum foil
• Cardboard
• Skewers
• Hot glue gun and glue sticks
• X-Acto knife or rotary tool
• Pliers
• Scissors
• Batteries (AA or AAA)
• String
• Syringes (without needles)
• PVC pipe
• Razor blades
• Highlighter pens
• Soda cans (Coke or similar)
• Paper clips

Level 10: Pencil Crossbow (The "Pen 15")

Step 1: Build the Base

Take several pencils and arrange them side by side. Secure them together using rubber bands and tape to form the main body of the crossbow.

Step 2: Add the Trigger

Attach a binder clip to the back of the crossbow. This will act as your firing mechanism.

Step 3: Load and Fire

Insert an ink cartridge (or a matchstick) into the barrel. Pull back the rubber band, press down on the binder clip, and release to fire.

Level 20: Matchstick Rockets

Step 1: Create the Template

Cut a cardboard template piece. Use it to trace the shape onto aluminum foil.

Step 2: Form the Rocket Body

Place a match head and a skewer together on the aluminum foil. Roll tightly, making sure there are no gaps. Use pliers to clamp and seal the tip.

Step 3: Make the Fins

Fold additional aluminum foil into small fin shapes. Attach them to the rocket body.

Step 4: Prepare the Launch Pad

Use a matchbox as your launch pad. Place the rocket on top.

Step 5: Launch

Light the tip of the rocket. The heat will activate the fuel inside. Stand back and watch it fly.

Safety Warning: Always launch rockets outdoors, away from flammable materials. Never point at people or animals.

Level 30: Rubber Band Toy Car

Step 1: Build the Frame

Glue popsicle sticks together to form the car's chassis. Let the glue dry completely.

Step 2: Make the Wheels

Use bottle caps for wheels. Wrap a rubber band around each cap for added traction.

Step 3: Install the Engine

Stretch a rubber band across the frame. This will store energy to power the car.

Step 4: Add Weight

Glue batteries to the frame for stability and better traction.

Step 5: Wind and Launch

Pull the rubber band back, lock it in place, and roll the car backward to wind it. Release to send the car forward.

Pro Tip: Build a small ramp with cardboard for epic jumps.

Level 40: Matchstick Shooter

Step 1: Prepare the Clothespins

Using an X-Acto knife, cut off the tips of two clothespins to create a grip.

Step 2: Cut the Trigger Area

Mark and cut out specific areas on the clothespins as shown in the original build.

Step 3: Attach the Spring

Connect the spring from a clothespin to create the trigger mechanism.

Step 4: Add Ammo Storage

Attach a drum of matches to the side for a realistic look and easy reloading.

Step 5: Load and Fire

Push a matchstick (with cap attached for explosive effect) into the hole. Pull the trigger to fire.

Range Test Results: Average distance of 27 feet.

Level 50: Hand-Powered Soda Fan

Step 1: Drill Holes

Drill holes into a popsicle stick and a plastic bottle.

Step 2: Make the Fan Blade

Insert a skewer through the popsicle stick to create the blade.

Step 3: Attach the String

Push a piece of string through the side hole of the bottle. Tie it to the skewer.

Step 4: Create the Pull Tab

Remove the ring from a bottle cap to use as a pull tab.

Step 5: Assemble and Use

Stuff everything back into the bottle hole. Twirl the blades to wind it up, then let it spin to create airflow.

Uses: Cool down hot food, blow out candles, or just stay cool on hot days.

Level 60: Battery Cannon (Requires Electronics Knowledge)

Step 1: Wire the Batteries

Connect multiple batteries in series to generate enough power. This will create heat inside the cannon barrel.

Step 2: Prepare the Barrel

Use a metal tube or thick cardboard tube as the cannon barrel.

Step 3: Make Ammo

Collect matchstick powder and feed it into the barrel. Crumple aluminum foil into a ball for the cannonball.

Step 4: Load and Fire

Drop the ammo into the barrel. Turn on the power source. The heat will ignite the powder and fire the cannonball.

Safety Warning: This project involves fire and potential explosions. Only attempt outdoors with adult supervision.

Level 70: Butterfly Knife (Practice Only)

Step 1: Create the Handle

Cut three popsicle sticks in half. Cut out two round hinge pieces from cardboard or thin wood.

Step 2: Drill Holes

Drill holes in the marked areas of the handle pieces.

Step 3: Shape the Blade

Cut a popsicle stick into a knife blade shape. Sand the edges smooth.

Step 4: Assemble

Use paper clips through the drilled holes to connect the handle pieces. Snip off excess wire and seal with hot glue.

Step 5: Practice Flipping

This is a practice butterfly knife only. Never use it as a weapon.

Level 80: Coke Bottle Mini Shooter

Step 1: Prepare the Bottle

Cut a hole in the bottle cap. Insert a straw that's wide enough for BB bullets.

Step 2: Add the Barrel

Cut an opening at the end of the straw for easy bullet loading.

Step 3: Install the Tubing

Insert tubing into the bottom of the bottle.

Step 4: Make the Handle

Hot glue a small syringe to the front of the bottle for grip.

Step 5: Power the Shooter

Attach a can of compressed air to the tubing. Alternatively, add a blowhole to the top for mouth-powered shooting.

Step 6: Fire

Press the trigger (syringe) to release compressed air and shoot.

Level 90: Smoke Bomb

Step 1: Prepare the Shell

Cut the top off a tennis ball to create a hollow shell.

Step 2: Make the Trigger

Cut off the striking edge of a matchbox. Fold it over a keychain ring. Place it over a wick and tie rubber bands to the ends.

Step 3: Mix the Smoke Compound

Mix equal parts sugar (fuel) and stump remover (oxidizer). Add a small amount of baking soda to slow the reaction.

Step 4: Fill the Shell

Pour the mixture into the tennis ball shell. Fill completely.

Step 5: Seal and Activate

Seal the shell with the trigger mechanism. Pull the keychain ring to ignite the wick.

Safety Warning: This mixture is highly flammable. Only use outdoors with proper fire safety equipment.

Level 100: Homemade Lawn Mower

Step 1: Prepare the PVC Pipe

Bend the tip of a PVC pipe to hold a small motor.

Step 2: Make the Blades

Glue razor blades to a round plate. This will be your cutting head.

Step 3: Connect the Motor

Attach the blade assembly to the motor. Connect wires from the motor to a battery pack.

Step 4: Add a Switch

Connect the battery pack to an on/off switch for safety.

Step 5: Test

Turn on the motor. The blades should spin rapidly.

Step 6: Upgrade (Optional)

Replace the cheap motor with a Dremel tool for 30,000 RPM cutting power.

Safety Warning: This is extremely dangerous. Razor blades spinning at high speeds can cause severe injury. Never attempt without protective gear.

1. Start small. Begin with Level 10 and work your way up. Each project teaches skills needed for harder builds.

1. Safety first. Always wear safety glasses when working with tools, matches, or spinning blades. Keep a fire extinguisher nearby for projects involving fire.

1. Use quality materials. Cheap rubber bands or weak glue can ruin your project. Invest in good hot glue and strong rubber bands.

1. Test in safe areas. Launch rockets and shooters outdoors. Use cardboard targets and keep people and pets at a safe distance.

1. Watch the original video. The builder's technique matters. Watch how they handle materials and assemble parts for best results.