Ralph's Fin Guide
thingiverse
Customized version of http://www.thingiverse.com/thing:695599 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=695599 Instructions Using the following options: wall_thickness = 4 glue_clearance = 5 jig_height = 35 fin_number = 4 fin_width = 6.5 tube_diameter = 25.5 jig_fin_width = 35 $fn = 250
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