Electric Pencil Sharpener

  1. Grades 9-12


Sharpen some pencils — and your engineering skills — with a pencil sharpener you build yourself! Construct the core, add the battery, and wire your mechanism up. Then learn about the invention of pencils, the evolution of sharpener design, and hidden engineering features that help your sharpener work smarter!

Why it’s awesome

  1. Auto-on switch

    Build a circuit that turns on with the press of a pencil.

  2. Desk display

    Case and tube are designed to show off the mechanism.

  3. Sketch to invent

    Designer’s notebook, pencils, and invention inspirations.

What’s included?

  • motor

  • 4 AA batteries

  • AA battery pack

  • sticky foam sheet

  • plastic tube

  • wood set (19 pcs)

  • tube lid

  • motor mount

  • 6 zip ties

  • 2 screws

  • limit switch

  • 4 pencils

  • notebook

  • 2 sharpeners

  • maker's guide

Topics explored

  1. Electronics

  2. Engineering + design

  3. Creativity + invention

Additional details

From the desk of the product designer:

Behind the design

What do innovators, inventors, artists, and engineers have in common? All their ideas start with pencil and paper. With this pencil sharpener and holder combo, you'll always have a pencil handy too for your next great idea.

- KiwiCo Product Designer

By the numbers


Motor's gear ratio


Trigger switches tested


Exclusive Eureka pencils in this crate



33 reviews

Customer images



    This is hands down the coolest project ever!!



    My grandson loved putting this together and then sharing it with his class at school. He is ten.



    Did not give any challenge to put together

    D&B Mom


    This is such an awesome and useful kit. But to be honest, the first kit didn’t turn on despite double and triple checking the connections. Kiwi was very quick to provide replacement motor/battery pack/wires (we reused the bulk of the original parts). It worked great the second time around.



    This was a little complicated, very cool and very practical. Perfect for my pre-teen!



    The pencil sharpener was great. I purchased it for my 3 grandsons, ages 5 twins aged 8, whom are being home schooled by their Mother. The 3 of them took turns assembling it. There was something that they could all do together. They were so proud at their accomplishment. They are using it in their home school classroom.

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