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http://www.thingiverse.com/thing:1421188
Drop-in T Nut for 80/20 brand 10-Series Extrusion by bradjshannon is licensed under the Creative Commons - Attribution license.
http://creativecommons.org/licenses/by/3.0/

# Summary

I designed this after ordering the wrong size T nuts.

The model is threaded roughly for an M3 (fine) bolt, but that resolution is beyond my printer's capabilities. However, M3 bolts do screw into this securely, as is. I'm sure it could be tapped or bored out for other threadings, as well.

This is intended to fit in 80/20 brand, series 10 aluminum extrusions, such as those used in TrickLaser's Rostock MAX METAL frame.

# Print Settings

Printer Brand: Solidoodle
Printer: Solidoodle 2 - Pro
Rafts: No
Supports: No
Resolution: 0.1mm
Infill: 100%

Notes: 
Printed at 100% infill (but they're so small it shouldn't matter much) and 0.1mm layer height.

I printed a whole bunch of them at once, with a 3mm brim around each to hold them in place during the print.

# How I Designed This

openscad