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Magic Pivot Business Card Dispenser

by skovgaar, published

Magic Pivot Business Card Dispenser by skovgaar Mar 24, 2013

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Description

This business card dispenser has a snap-on lid, but there is no material at the axis of rotation, so it looks really cool. When you rotate the lid, the oval hole lines up so that you can slide out a card with your thumb. There is also a little nub that catches and holds it closed.

Video: youtu.be/P1VHHy6cXok

Recent Comments

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Only thing I see to do to improve this is to make some recessed holes for magnets so that it has more "bite" when you close it. Maybe thats something i could work on as my first project. I'm still at the finding cool things and printing them phase.

Oh, I'm sorry - my bad. I didn't scroll down enough... Sorry for the disturbance.

I'm not sure what you mean, as the .ipt parts are already posted and free to download and customize. Can you explain what you are asking more clearly?

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Instructions

I never bothered to figure out how to properly orient my stl files, so you'll have to flip them around in your slicer. The parts are not symmetrical, though, so if you mirror in z make sure to mirror another axis (x or y) so that the little catch mechanism that holds the lid closed ends up on the correct side.

The tolerances on the pivot mechanism are a little finicky, so I have included two "proof of concept" stl files to test it out. That way if it doesn't come out right you won't waste too much plastic. If it's not working, try lowering the print speed, make sure you're not overextruding or underextruding, etc.

I used a clamp to force the ends together, try and line up the lid and base so that there is minimum overlap of the pivot mechanism to facilitate snapping them together without breaking it. There are a total of 6 sliding contact surfaces, but in some orientations only 3 of them are touching (about 22.5 degrees from the closed position). This is how I would recommend you line it up before snapping it together.

Initially, it was quite a tight fit and didn't spin very well (I'm guessing from little blobs on the sliding surfaces, so clean them off!). After playing with it for a while (about 20 minutes) I was able to get it to spin really smoothly. Alternatively, if your proof of concept print is binding too much, take some sandpaper to the sliding surfaces (lightly) before snapping the parts together on the real thing. Once you have it worn in nicely, dab a little WD-40 on the pivot for extra silkiness.

Also, put a little rectangle of clear tape on the ramp inside of the base, otherwise the layers will grab the edge of the business cards and they won't slide out nicely.

I had some pretty significant warping at the corners, so I imagine you would get better results on this print if you have a heated bed.

Edit: I added some with ears to reduce curling without a heated bed, which work beautifully.
Edit: some people are having problems with the joint being too tight. I have added files in which I have concentrically widened the groove on the top piece.

Comments

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mike052082 on Mar 26, 2014 said:

Only thing I see to do to improve this is to make some recessed holes for magnets so that it has more "bite" when you close it. Maybe thats something i could work on as my first project. I'm still at the finding cool things and printing them phase.

Ebsteri on Sep 15, 2013 said:

Skogvaar, would it be possible to have .ipt parts of your magnificent card dispenser for personalization via email?

skovgaar on Sep 15, 2013 said:

I'm not sure what you mean, as the .ipt parts are already posted and free to download and customize. Can you explain what you are asking more clearly?

NeuroVator on Sep 12, 2013 said:

I made one, but the corners were too thin and they bent when I snapped it together. I was also not able to swing it open and closed easily. I think it is a great idea, but should offer deeper reservoir for cards and be easier to snap together without bending or breaking it.

HunterDjorn on Aug 2, 2013 said:

Skovgaar I also use Inventor and would love to personalize your amazing card dispenser. Could you make the .ipt part available or email ti to me?

skovgaar on Aug 5, 2013 said:

The Inventor .ipt files are posted :)

BKNJ on May 13, 2013 said:

Just printed this. Came out great. One issue is that the Base is "upside down". Using OpenSCAD, it was easy to flip (so solid side prints first). Simply save the Business_Card_Holder_Base.stl file in the same directory where the code below will be saved:

translate([0,0,6])rotate([0,180,0])
import_stl("Business_Card_Holder_Base.stl");

Thanks for a neat design!

Bryan

flaboy on May 11, 2013 said:

the circle mechanism could you do just a part of that in the front to make it lock. so 2 groves left side right side then the lid "circle part" would slide into it as you rotated it back to shut. there fore locking it.

skovgaar on May 11, 2013 said:

Ahhhh, I see. That's a really smart idea. I posted the inventor files, so have at it. Post what you come up with as a derivative :)

flaboy on May 7, 2013 said:

Made it! really cool. Would like to know is there any way you could add 1/2 a circle to the front so it stays locked down mines curling up also can you shrink it to fit just credit cards I'd like to use it as a wallet! Or post the Autodesk files so I can modify. Thanks!

skovgaar on May 7, 2013 said:

I don't understand what you mean by "1/2 a circle to the front." If you want it to fit credit cards I would recommend scaling it down in your slicer to the appropriate size.

mza1979m on Apr 15, 2013 said:

I wouldn't recommend using WD-40, as its intended purpose is not to lubricate. I would use a standard household oil or a multi purpose penetrant that's designed for lubrication.

skovgaar on May 5, 2013 said:

We're not talking about lubricating your car's engine, it's just a freaking plastic business card dispenser. I assure you, WD-40 will do the job just fine. And while we're on the subject, WD-40 does indeed lubricate, as it contains mineral oil (a light, low-viscosity lubricant). Anyone who tells you otherwise is spouting off something they heard somewhere trying to sound smart.

Andychn on Apr 6, 2013 said:

I had trouble getting the fit. I had to use my slow, dremel-like tool thing to grind a bit away from the bottom inset parts. However, I gotta say... the result is one excellent Thing. It is sooo cool! Thank you!

MakerBeck on Apr 4, 2013 said:

I just made two of them, a third one is printing. The first used the standard files, worked but warped from being too tight. I used the loose top for the second build and left it on the build plate to cool down to avoid warping. Parts came off perfectly flat but were warped when snapped together so I had an idea, how about stress relieving/deforming it in boiling water (212F) for a minute or two? First attempt, I did it for almost three minutes and then plunged it into ice water. This did the trick, EXCEPT, the thin bottom wall warped a little. I am going to do the second one for a minute and see what happens.

skovgaar on Apr 8, 2013 said:

Take some sandpaper to the surfaces that are binding before assembly. It won't add much time at all to your already extensive post processing.

MakerBeck on Apr 3, 2013 said:

Just printed the standard files, both at once on my replicator with not raft (thanks to a bed leveling pattern I tried out the other day. It snapped together fairly easily but the thin part is warped enough that cards would fall out.
I am going to try it again, two ways:
1. Let it completely cool down while still stuck to the heated build plate so it is held in place while stresses relieve themselves.
2. The version with the extensions.

brucem on Apr 2, 2013 said:

Great design, and the looser version worked great on Rep2 PLA. I see in the video that you personalized a version with a monogram, which would be very special. Any chance of sharing an editable/Scad or similar format?

brucem on Apr 3, 2013 said:

OK, I went and answered my own question. You can open STL in OpenSCAD and attach or carve out intersections. Looks like it will work well...

Greasetattoo on Mar 26, 2013 said:

What did you design this in? Very cool...

skovgaar on Mar 26, 2013 said:

I use Autodesk Inventor. Autodesk gives students a 3-year free license for any of their software, and it is absolutely amazing.

nobody_home on Mar 26, 2013 said:

Cool!

I would like to see a video showing how it works! ;)

skovgaar on Mar 26, 2013 said:

video posted

skovgaar on Mar 26, 2013 said:

Okay, I'll get one up this afternoon.

MacGyver on Mar 26, 2013 said:

I printed out the proof of concept. Too darn tight to turn. The base bends when I attempt to turn it more than 2/3rd's of the way around.

skovgaar on Mar 26, 2013 said:

I just made another one myself to test out how well the ears prevented warping (pretty darn well!) and you're right, it is very tight in the beginning. I played around with mine for about 20 minutes (just enough time to sit and watch a tv show on hulu) and got it spinning quite freely. If you don't want to take that long you could lightly sand the sliding surfaces before snapping them together. Also, any little blobs on the sliding surfaces will cause it to bind, so make sure you have them all cleared out.

Derekmellott on Mar 25, 2013 said:

It is unfortunate that this is too big for my T-O-M.

skovgaar on Mar 25, 2013 said:

I think you could scale it down to 95% of normal and it would still work, or you could trim your business cards :)

skovgaar on Mar 25, 2013 said:

How close is it? I've seen a couple different specs for the tom build area (I gather that it depends on how you configure your build plate). The cards definitely have some wiggle room; I did some quick calculations and I think it would totally work if you scaled it down to 95% of the original size. Or you could scale it down more and trim your business cards :)

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