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Old 02-11-2019, 08:23 PM
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Bipe Flyer
 
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That's a good question. They're like a heavier version of an X-acto knife blade. They sell replacement tips, so you don't have to replace the whole blade unit, but they're not exactly cheap either.
https://www.amazon.com/Cricut-200391...gateway&sr=8-6

I'll probably try sharpening mine with a diamond stone when it gets dull.