Serrated Knife for Trimming Expanding Foam
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This is an easy and quick print to make a knife to trim spray-in expanding foam insulation
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I needed to trim some expanding foam that expanded much more than I thought it would. The instructions on the can say to use a serrated knife. I was going to use our bread knife, but I was given "the look" so I decided to print one. It worked great for the roughly 3' of foam I had to trim. If you have a lot of trimming, you may want to print more of them. The blade is flexible which lets you get nice & flush without beating up your knuckles.
Print the first 1mm as thin as you can so the serrations have a decent angle. I printed mine at 0.15mm.
Here is a video of me using it: