Grout saw modified for blade with holes on 22mm centers.
thingiverse
I have very narrow grout in my mid-80s shower. I bought a popular brand of gout saw/scraper but the blades are way too thick (2.25mm).I found some narrower blades on Amazon (made by M-D Building Products) that are 1mm thick. But these have a very different blade mounts that what seem to be the "standard." I found this fantastic model made by LatinOwl and made some slapdash mods in TinkerCAD to accommodate this different blade type/size. It's working great!
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