Project Shellter - Customizable Oxystele sinesis

by TeamTeamUSA, published

Project Shellter - Customizable Oxystele sinesis by TeamTeamUSA Mar 6, 2013


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3251Views 929Downloads Found in Jewelry


Why should only hermit crabs wear a shellter?
Now both crabs and people can enjoy Oxystele sinesis "heart" shells!

Create a customized home for your crab, and a stylish necklace or earring for you that reveals where another species lives.

The Customizer is the missing piece to enable a hermit crab caretaker to make the correctly sized shell for a crab. A Sage (www.sagemath.org) version has been in development, but when the Customizer was announced, development shifted to this thing.

This is a first version; other versions will be forthcoming.

Please use and report any issues in the comments.


IMPORTANT - If you see a red exclamation point (!) in Customizer, the STL will not be created correctly! Please adjust settings and try again.

One thing for two species!

Shell (for hermit crab)

  1. Remove hanging ring
  2. Print

Shell (for person)

  1. Rotate and position hanging ring - or remove it all together
  2. Print
  3. Optionally, attach earring wire or leather cord for necklace

Slice (for person)

  1. Use the values in Slice Instructions to get started
  2. Adjust Slice Position and Slice Thickness to your liking
  3. Rotate and position hanging ring - or remove it all together
  4. Print
  5. Optionally, attach earring wire or leather cord for necklace


  • When creating a shell slice, there are a range of slice thickness/slice position combinations that just do not work. Most of the non-working combinations have been determined and if you use one, you will see a red exclamation point above the shell slice. An STL created when the exclamation point is visible will be a cube.
  • Keep the Slice Position within the range of >= -49 and >= 82, and the Slice Thickness >= 5 for best results.
  • If your STL is a cube and you didn't see an exclamation point, please adjust the slice thickness and/or slice position and try again. Please leave a comment pointing to the cube STL so that the combination can be added to the warning() code.

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Thanks! :)

Wish the Customizer and the http://ply2scad.pyply2scad.py tool were around back in 2011 during the heyday of Project Shellter. Extending this to other pets is a great idea!

This is really, really cool -- and sets up an interesting precedent: how about practical dog and cat printed objects that have a parametric setting to kick out the "charm" or pendant form for the owners? Even better, this is a project that really benefits the little creatures, as I've seen during the experiments at MakerBot a couple of years ago.