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If you have a workspace where the shavings aren't an issue, go with aluminum. If you're just going to make it in the garage, go polymer. Those aluminum shavings are like glitter and go EVERYWHERE. And some people in the home get a little upset when you track metal shavings into the house.

Other thing a poly unit does. No need to finish it. And adding something like some Cerakote to the cost makes it less of an advantage from a cost perspective.

I'd definitely say do it. I did one just so I can say I had. It's a fun little project.