This was a remix of http://www.thingiverse.com/thing:401885)
The Square at the end is 7mm x 7mm and should replace that broken or lost key just nice.
Update 24/05/2016
Printed with Supports at 'minimum'
Layer .2mm
Works a charm. Came out lovely and most of all, functional!
lofthatchkey.stl | 384.4KB |