yes i know the ones on the market look like this but you cant but thoes for $5
here is what you need to buy all at wal mart
one of thoes litttle fans $2.50

a little container cant find a picture but go down the travel isle in you can find these container two for $1
and last a guitar pick $1
1.Your fan take off the blade
2 get your container drill a hole in the container about the same size of the pole on the fan but not too loose
3. get a glue gun and glue around the pole but not the pole
4. stick the container to the fan
5. cut up the guitar pick like below

6. drill the same size hole in the pick as in the container
7. throw some weed in there and turn it on and you go a electric grinder
*** when i make another one ill take pictures and add them to the steps
***** you can you a measuring tape, tape instead of the guitar pick it works better but the pick is a lot easer
here are some pics of mine i didn't throw much weed in there and also it produces a lot of keif if you let it spin for a while

here are some pics of my first home made grinder this one was a bit more complained also this one has the measuring tape, tape
hope you enjoy