I want to buy refills. what size gumballs should I buy? The small ones- dime size? or the large ones about size of a quater?

Thank you for your question! The gumballs that fit in the Gumball Machine Maker are about 5/8" (0.6"), so slightly smaller than a dime.

I use it with our marbles and marble run. Beware, however, some tricks just don't work well with the weight of the marbles. Luckily, my son loves it when the marbles fly off the track anyway.

Do you have a link to purchase refill gumballs?

I bought the dubble bubble 20oz gumball machine refill

How tall is the completed gumball machine?

The built Gumball Machine stands at 17 inches tall.

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🎉 Build, Learn, and Snack: The Ultimate Gumball Adventure Awaits!

FUN MEETS LEARNING - Explore mechanical physics through exciting stunts and challenges.
LIMITLESS CREATIVITY - Reconfigure track segments for endless gumball machine designs.
AWARD WINNING QUALITY - Join the ranks of satisfied families with this Parents' Choice silver award winner.
PERFECT FOR FAMILY BONDING - Engage kids and parents alike in a fun, educational experience.
UNLEASH YOUR INNER ENGINEER - Dive into the world of physics with hands-on experiments!

The Thames & Kosmos Gumball Machine Maker Lab is an innovative science kit that combines fun and education. With 12 experiments focused on mechanical physics, this award-winning kit allows users to build their own gumball machines using modular track segments. It includes a small supply of standard 16-mm gumballs and is designed for novice builders, making it perfect for family engagement and learning.

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