Instructables
Picture of Marble Money / Paper Clip
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I wasn't intending on entering the money clip contest, but as I was looking through all the current entries I found that all (bar a couple) seemed to be of a traditional design - using pressure from the 'bend' to hold the money in place. That inspired me to try and enter with a different method...

I made something similar out of wood and a marble when I was a kid so I know the theory of this works - so hopefully my 3D modelling does too!

Within the 3D model there is a 12mm 'ball'. You could use a marble of a similar size if you wanted to...

Date Made: September 2013
Approx Cost: (Cost of printing?)
Approx Time: 3 hours modelling (plus printing time)
Difficulty: Easy/Medium
 
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Step 1: How It Works

Picture of How It Works
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There is a recess in the top runner - this recess is to stop the ball falling out.

Once printed, the ball (or marble alternative) needs to be inserted inside the 'runner'... This should just pop in (as long as the 3d printing material isn't too brittle!?!).

It is the pressure from this ball that will 'grip'.

The angle of the top runner means that 'grip' is adjustable - depending on the thickness of the paper inserted.

So to get the clip to grip, you insert the paper between the bottom (flat) runner and the ball. Then let the ball drop down to the narrowest gap (between top and bottom runner). Then slightly pull the paper back out - this will tighten and jam the ball between the top and bottom runner, holding the paper in place...

Hopefully that makes sense!?! I have done some sketches to try and help the explanation...

Step 2: The Model

Picture of The Model
for printing.png
I have built a 3d model, hopefully ready for 3d printing...

This was done using tinkercad and can be found on their website by searching for "Money / Paper Clip" or here:


Mr_o_uk (author) 1 year ago
I don't have time to make another instructable at the moment, but here are a couple of bonus concept designs for variable money clips:

https://tinkercad.com/things/0mIUcz1odzh-staged-clamp-money-paper-clip/

https://tinkercad.com/things/4yXK6IPauXt-rotating-money-paper-clip/

Or go on to tinkercad and search for "money paper clip" and you should find them.

They may work, they may not, and they aren't in a state you can print, but thought I'd share them as concepts anyway...
poofrabbit11 months ago
Well done on your win in the Money Clip Challenge!
Mr_o_uk (author)  poofrabbit11 months ago
Thanks, a place in the winners is always appreciated!
bfk1 year ago
Well, I wanted to stop by and say how great I think your idea is... Then I saw your MGB GT and now I'm thinking, "Gee", a British sports car aficionado... Just like me. This guy's REALLY cool. Good luck to you, my friend and think of me and my car, in the messy and expensive process of getting a body-remake. :/
P.S. I voted for you.
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Mr_o_uk (author)  bfk1 year ago
Nice car. If that's your garage too, I'm even more jealous! I've had a couple of mgb's and built a lotus 7 replica too. No space for cars at the moment tho. Need a bigger house with a garage...

Just looking at your pyramid puzzle. Might have to have a go at that...
bfk Mr_o_uk1 year ago
I wish... That's a 17,000 sq ft facility my local car club owns and where I store it. Thanks about the pyramid puzzle. Rather than hijacking your instructable, I'll PM you wit the details.
bfk
I wanted to see the winning project in this contest. When I saw the shape of the money clip I was like seriously?; but it was when I acknowledged how it actually works I realized how awesome and golden this money clip project is.
I didn't remember it being this big. My wife said it did have a magnet on it, but was not adhered very well. When the magnet fell off, she replaced with double sticky pads to hang stuff on wall. I may have a smaller version of this item around here somewhere, but I was lucky enough to find this on right away. And my wife reminded me that the guy made these to hold notes on the fridge--grocery lists, "I'll be back shortly" notes, etc.
Another try.
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Mr_o_uk (author)  ragdolldude1 year ago
Cool. It's much bigger than the one I remember making. And I seem to remember mine being made of 3 pieces of wood not 2, but the principle is the same.

The channel on it seems really deep. I'm wondering if the channel in my 3d model is deep enough to keep the ball in place now!?! Maybe someone will print it and give me some feedback, or develop the design.

Thanks for the effort of finding and photographing it. Much appreciated.
I took 2 photos but can't seem to upload them. Help?
I've had something like this for over 20 years. It's made of wood and a large ball bearing with a magnet to hold it to a metal surface. I believe it was made to hold notes on the front of a refrigerator.
Mr_o_uk (author)  ragdolldude1 year ago
Any chance of a photo? I'd like to see if it's similar to the one I made as a kid. Also it may inspire someone to make their own wooden version....
Just found it. My wife got it at a senior center about 30 years ago. It had projects retired people made to sell. It's about 5 inches tall and about 1 1/2 inches wide. This one has double stick tape on the back of it.
kf5qgf1 year ago
the tickets are normally 8.75 cm by 12.5 cm, and the ticket holder will hold 12-15 tickets stacked and they won't fall. you have to have a channel for the marble to ride in don't you so it doesn't roll out? if I ever get around a 3d printer I might print this, great concept. has my vote.
kf5qgf1 year ago
this is the same way ticket boards in restaurant kitchens works.
Mr_o_uk (author)  kf5qgf1 year ago
I didn't know that. Just looked it up, and they use ball bearings. I imagine that is because of the weight - probably a good option.

They seem to be fairly short, I guess a ticket is only ever 1 sheet thick, so they don't need the variance?
Hey this is rad! Can you attache the .stl file to your Instructable?
Thanks
Aud
Mr_o_uk (author)  audreyobscura1 year ago
I'm afraid I don't have a .stl file.

I did it using tinkercad. If you go to www.tinkercad.com it's free to sign up for an account, then you can find the model by searching (I made the model public so it can be copied and edited).

I think you can download the file from there too - although I don't know in which formats...