From my site: http://www.atl-3d.com/use-closed-cell-foam-for-alignment/ Use foam to align mirrors without smoking them.

Lasers
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From my site: http://www.atl-3d.com/use-closed-cell-foam-for-alignment/

Use foam to align mirrors without smoking them.
http://www.atl-3d.com/use-closed-cell-foam-for-alignment

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‘Thor’, very cool name :slight_smile:

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I made acrylic targets that fit inside my mirror housings…no smoke can get in that way either.