These are laser cuttable versions of the fin templates provided in the Estes Designer's Special scratch-build rocket kit. I provide them here as SVG files, which should import back into Inkscape for cutting setup (think adjust the line weight and color) or directly into your laser control software.
Scroll down for How I Designed This and my Laser Cutting Settings for more important details.
I do not claim to have created these templates, nor am I attempting to sell them. The sole purpose of this thing is to aid in fabrication of model rocket fins.
Scanning in the hard copy template
Using an HP Envy Photo 7800 at a resolution of 150dpi, I scanned the hard copy to my computer and saved it as a PDF. The raw scan is available in the files of this Thing if you need it.
Creating the Inkscape design
I first imported the PDF into Inkscape using the default settings. Although PDFs are vector graphics, each fin shape in the scanned PDF wasn't a separate object. Therefore, I had to create my own paths from it. The best way I though of was to simply use the Create straight lines and Bezier curves tool and trace each fin. While this was time consuming, I managed to make an accurate SVG file for each fin. I then adjusted the canvas size to fit the fins exactly.
My laser cutter is a 5W diode laser kit, so it isn't very powerful compared to the expensive 40W CO2 machines. However, it seems to cut balsa very well!
Fin Stock: 2mm thick balsa wood*
Laser power: 100% (S1000 in grbl)
Laser speed: 500mm/min
Passes: 5 to 6
Scale (to account for kerf): ~108%
*Make sure to align your stock or rotate the fin in your CAM software so that the grain direction follows the angle of the leading edge.
Keep in mind that different machines will produce different results, and you may need to find your own settings for cutting balsa!