pencil stand "Shukhov"
thingiverse
Customized version of http://www.thingiverse.com/thing:470273 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=470273 and repaired with https://netfabb.azurewebsites.net/ For shorter pens, consider http://www.thingiverse.com/thing:908389 with 1/3 less material and cost, or https://www.thingiverse.com/thing:2555845. The rails of these three things are absolutely straight, although they look bent: The hyperboloid of revolution is a ruled surface (https://doi.org/10.1098/rstl.1669.0018). Instructions Using the following options: height = 100 radius = 40 th = 40 an1 = 96 nsp = 15 twist = both
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