Canary knives are one of the important tools when working with cardboard.
Diego from Lectrify { https://www.lectrify.it/ } shared a #3Dprinting file on Thingiverse { https://www.thingiverse.com/thing:4923987 } so you can print handles to go with replacement blades. This might bring the cost down a little, or let kids personalize their tools. I picked up a couple of replacement blades on amazon { https://www.amazon.com/dp/B00GJKE66E }
I don’t have the exact right size screw and nut. Diego says M3 8 mm would fit best. I have 4-40 1/2″ which are a little long and the nut is a little big to fit in the slot. But it holds fine.
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