Great job R'Gi... and of course a very useful write up that will give inspiration to others for ideas in diversified projects. 

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I cut wide finger joints on the ends of the side walls of the caddy, then cut out large radius openings on each side to allow access to the napkins. 
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Did you laser cut, or cheat and use conventional tools?

Hope amongst all the beers, the recipient doesn't mistake this for a back-scratcher,

without a leather jacket like this,


If your first cut is too short... Take the second cut from the longer end... LBD