The National Association of Rocketry (NAR) offers sanctioned rocketry competitions, with over 25 different competition events.  One of those events is payload altitude.  In this event competitors attempt to carry a 1oz (28 gram) payload to as high of an altitude as possible.  To ensure fair and consistent competition, a standard sized payload is defined.  This instructable describes how to make your own standard payload using a 3D printer.

I made this at TechShop  www.techshop.ws

Step 1: Materials and Equipment

3D drawing software (I used Autodesk 123D)
3D printer (My TechShop has a MakerBot Replicator)
About 1oz (28 grams) of fine sand
150 grit sandpaper
Something to scrape with (hobby knife, chisel, etc.)
ABS compatible adhesive (can use ABS scraps and acetone)
Small scale (with sub-gram resolution)

This instructable assumes some basic familiarity with Autodesk 123D, ReplicatorG, and a MakerBot.

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