That’s a cool idea. Especially for someone selling custom speakers. Concrete can look this nice unfinished actually. It all depends on the aggregate, vibration and mold. But I’ve been having really amazing results. There’s 4 different approaches I’ve tried: mixing my own with white Portland cement and super fine sand, using artisan off the shelf stuff from Buddy Rhoades, using polymer modified gypsum plaster from smooth on (called forton mg) and just coating an mdf box with lime cement (limestrong plaster brand). All of these produce great but different results and different costs. I highly recommend anybody considering doing your method of 3D printing a reusable mold and wanting the smoothest and most finished look out of the mold check out a polymer modified gypsum plaster like forton mg or Duo matrix.

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