Star Shafts and Disks
by VeryWetPaint, published
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I made these files to verify my 3D printer built accurate part geometry regardless of part orientation.
There's a series of star-shaped shafts at various angles, and a series of disks with star-shaped openings that should fit over any of the shafts in all 8 rotations.
A recent comment by Tony Buser (http://www.thingiverse.com/derivative:21136) got me thinking that this might be an instructive test for hobby printers, too.
On a hobby FDM printer (eg: Cupcake, BFB300, etc.) the untilted starshaft00.stl and stardisk00.stl will probably print and fit together just fine. The disk should fit onto the shaft in any of its 8 positions.
But tilted versions of the shaft and disk, like starshaft30.stl and stardisk20.stl, will probably deviate from the star-shaped cross section sufficiently that the fit of the disk will vary...if it fits at all.
If you want to customize the angle, spacing, or shape just edit starshaft.scad with OpenSCAD.
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Star Shafts and Disks by VeryWetPaint is licensed under the Public Domain license.
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