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Nice Instructable. Is there any associated dangers about mixing Hydrochloric acid and Hydrogen peroxide that we must be afraid? Mixing 3.5% Hydrogen peroxide with diluted Hydrochloric acid is very common to perform some processes (including etching).
Another "machine" that you already need a real machine (cnc or laser or 3d) to build it? No, thanks. We are tired of that.
A DIY "machine" that needs another machine to build it? No, thanks. We are tired of that.