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That is a really neat idea!I have quite a few old speakers in my various junk boxes so will have to give this a try.
We use coloured LX tape around tool handles backstage so that all of the techs can keep track of the spanners, screwdrivers, hammers, wire-cutters, whatever.
Excellent idea - I will give that a go with the socket set first because that's the one I find I have to peer at in order to see which size it is.
You only need to adapt your starting image with such curves if the sides of the glass that you're engraving are not parallel (hence using a correction angle that matches the slant of the glass).I usually engrave images onto cylindrical glasses or cuboid flasks - the parallel sides mean no need to adjust your template (other than scaling)!(Nice 'ible though darthwolf!)