One thing that many people have not tried to laser engrave here is food items. In the past I had experimented with engraving into an apple and the results worked pretty well. Here is another example we’ve come across by somebody else where they engraved into a banana. The result is a banana with a custom pattern that is still very much edible.
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Check out this amazing build. It’s a lego machine that builds with lego blocks. So it’s essentially a lego 3d printer. You load in a cad model, the printer grabs the correct sized brick and snaps it into place. It’s also able to rotate the base as it’s building. Great way to automate your lego building experience. More information at BattleBricks.