Instructables
Picture of knuckleduster phone case
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Talking on your cell phone can be a dangerous affair. Better arm yourself with some kind of defence in case someone tried to tangle with you while you're gabbing away. What better way than to combine a knuckleduster with a phone case! You may have seen these neat "knuckle" iPhone cases, which is an iPhone case within a knuckleduster. However I wasn't a fan of the $99 price tag, so I decided to make my own. 

I have zero experience with any type of 3D modeling software. So, you can understand my apprehension when I wanted to make my own custom 3D printed object. Luckily there was a very detailed Instructable already written on how to make your own action figure that outlined the process, showing that mashing up existing 3D models is easy. Making my own custom 3D model was so simple I  was able to make my model in about an hour on the computer. 

This project uses the free modelling tools Netfabb, and MeshMixer. I printed my model through another service, but there's currently an offer through Instructables to print a model for free! You could make your own for almost nothing! How great is that?!
 
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Step 1: Find models and convert with Netfabb

Picture of find models and convert with Netfabb
After a quick search online I found 2 free models on Thingaverse:
If you don't find anything you like on Thingaverse there's loads more models on 123D Gallery and TurboSquid.

If you've downloaded .STL files you'll need to convert them to .OBJ files before you can edit them (if you have .OBJ files then skip to the next step). After you've found the models you want open each model separately in Netfabb and export as an OBJ file:  Part > Export Part > As Wavefront OBJ. Next, we'll combine the models in MeshMixer.
Henry Jones21 days ago
Good luck getting this through the airport...
MicioGatta1 month ago

Genial!!!!!!

Iffem_shut-up-and-take-my-money.jpg
afosterw2 years ago
You best check the legality of brass knuckes in your state. They are illegal in many states.

this would most likley hurt the user more than the person being hit as the rings would snap off. Also the iphone would quite likley be damaged.

they don't look BRASS to me....
beardyclam2 years ago
pow pow pow!
black hole2 years ago
If you could make this in steel, you'd have a serious weapon. =D
5* and voted.
Only if it was for a Nokia!
How does this possibly fit in your pocket?
HoldOnTight2 years ago
I like the 'ible, not because you made something cool, but because you show the steps of how easy it is to create any mashup of things for that CUSTOM COOL FACTOR! Consider duplicating and titling the 'ible to align with the process you followed! This is "The Essence of Instructables!" 11 Stars!
oilitright2 years ago
Could a person use this combined with lost wax casting in brass to produce a more "durable" version? Inquiring minds want to know.

I wonder how many jurisdictions would call it an illegal weapon?
meshmixer2 years ago
Cool! Just so you know, you can also use meshmixer to make your model watertight. There is a tool called the Inspector (click on 'Inspector' in the action bar when you have nothing selected in the model). There is a brief demo in this video:

http://www.youtube.com/watch?v=UUufQ9zFh-Y
This looks great, but how feasible is it for the average laymen to do this? If it is easy then this could be a new hobby of mine lol
rocket (author)  biddingsites2 years ago
It's super easy, the software to make the model was free and was very simple to use! (and I have no 3D model-making experience prior to attempting this)
Cool, good to know it's that easy. I never knew (until this post) that anyone can make a model and send it to be fabricated... I must be getting old lol
ashbegash2 years ago
Cool!
scoochmaroo2 years ago
Love it!
yallen2 years ago
You could also cut a knuckleduster shape from plastic or wood and glue to an existing case.