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Hard Drive Sander
DIY $5.00 Sandblaster
Voltage Regulated [5v] Bicycle Dynamo Light & USB Charger
Make Your Own Li-Ion Battery Pack
I still haven't published here in Instructables, but you can check a lot of pictures and also the design process in here: https://www.facebook.com/media/set/?set=oa.762814677106232&type=3 (in Portuguese, but Google translate gives a reasonable result).
How to Build Your First RC Plane for Under $100 - Transmitter, Shipping, Battery, Charger, and Hardware Included
Control ESP8266 over the internet (from anywhere)
Complete newbie step by step, 3D printer with all parts lists
All You Need to Know About LEDs
A Wide-Body Quadrotor - designs and ideas to build your own.
High Performance Grappling Hook
Bike Trailer -- tough and light