I was just curious about how hard it would be to make a coffee grinder that is built into a cap that screws directly onto the H2JO coffee filter thingy from GSI. It ended up taking me about 10 minutes to convert my old wooden box hand grinder into a really solid frankengrinder prototype. Its fairly light and gets the job done better than the original grinder did. All i needed for the conversion was some random cap i found (nalgene cap would work better but i dont have a spare) and a small cat food can. Drilled 4 holes and cut out the cap and can with a dremel.
To use it i just screw the grinder on, grind directly into filter while water boils, pour water over, replace cap and swish to steep. Done.
I can and will make the whole thing much lighter. But for now it works and i'm pretty stoked about how easy it was.
Grinder threaded onto H2JO
Whole rig on Hydro Flask, View of inside.
