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Geared Pumpkin for Halloween!

by UrbanAtWork Oct 8, 2015
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Have you thought about tagging each pumpkin piece somehow to make assembly easier? You could maybe put dots on the bottom (where the part attaches to the center element). Since there are 8 pieces, a combination of 3 dots would allow you to "number" each piece without sacrificing a lot of stability I would think. Then you could put matching dots on the center element and assembly would really be a process of "connect the dots."

I'll try to describe further what I mean. Each of the pumpkin parts has a flat face that will ultimately mate up with a flat face of the center bit. Suppose on the first component you have this ... which is binary zero. On the center d8 you put the same pattern. On the next part you have ..o and again a matching design on the center part. The dots go like this:


Now you have a very concise marking / numbering system that can be represented with a very small inset, which hopefully would be small enough to not impact the durability of the piece. And, as mentioned above, assembly is literally connecting the dots. :)

Thanks for your contribution! I am making this now and will post a make when I'm done.

Hi Drathbun,
That is a great idea! I have actually thought about doing that before and even started adding it to the model... until some real like work got in the way and then I forgot about it.

I started by adding text cutouts "A" , "B", "C" .... then moved to using shape cutouts: squares, circles, and triangles. If I have time later this Winter I might try to put together a video on how to make your own geared whatever, based off of the scripting that Emmett started.

It think adding the numbering to the script would be better than just adding it to the STL files... then it works for all future geared up objects.

I have a had a couple of requests for this so maybe check out my youtube channel, subscribe? or check in, and hopefully I'll get to it.


PS: Did you print the pumpkin? I'd love to see your complete model when it's done. :)

I have the core and the pins and five of the parts done. Number six is printing as I type. I'm struggling a bit with figuring out how it all goes together which is what spawned my comment. I feel like if I don't put it together in exactly the right way, with the right gear teeth interlocking at the beginning, then the pumpkin shape is off. When you assemble it, do you start from the top (or bottom) and work your way to the other side?

For example, the top piece is not symmetrical. The teeth are shorter on one side when compared to the other. So there is definitely a right and a wrong way to put it together with the rest of the pieces. There is a series of pictures that were downloaded with the rest of the files. I feel like they're trying to tell me something. There is clearly a top, bottom, left and right view. But since the parts are labelled with the names found on the .STL files I'm resorting to trying to figure out which part I have printed shows up where in the pictures. Is that the correct approach?

The files are named gear1 and gear2. Are those top and bottom?

By the way I had a good laugh at your "Gourd of Doom" reply earlier. :D

Edit - I watched the "how to assemble an egg" video, and that gave a good hint. The bottom of the pumpkin has 18 teeth. The gears that interact with it (touch it) will have 15 teeth. The pumpkin top has 15 teeth, and the parts that interact with it will have 18 teeth. So that recognition helps me understand which parts go on the top and the bottom, which is a big help. As it turns out, I have printed all of the bottom parts and am starting to experiment with putting them together.

Forgot to post a link to my channel... AND there is an Geared Egg version and how to assemble it here too: https://www.youtube.com/urbanatwork

Hi Drathbun,
I recently made one for the front office at the school I work at and it really isn't that hard.

The sequence I'd use is as follows:

  1. Put in the pins for the top and bottom pieces and attach them to the core. (those pieces should be obvious)
  2. Next, WITHOUT putting the pins in, test fit each of the larger three upper pieces, I think they are labeled 1 but I think you can tell which are tops. Align each piece to the lines or ribs are vertical and pin them into place.
  3. Repeat the test fit, then pin in place process with the 3 lower (smaller) pieces. These are tricker but if you just check to make sure every seam feels smooth like a pumpkin you should be good.
  4. Worst case, pull it apart and try again. (then it is just a cool puzzle!)

The more it gets played with the smoother it will work.

Enjoy and watch your fingers,

Yes, I figured out which are top / bottom and edited my original comment. You may have missed it since it's an edit. The top part with the stem has 15 teeth. The next layer of pumpkin parts will have 18 teeth. The third layer has 15 teeth, and the bottom piece (as you say, the top and bottom are readily recognizable) will again have 18 teeth. You mentioned earlier that 5 revolutions is required to come back to the starting position. The ratio of 18:15 is what causes that. It's ultimately a 6:5 ratio if you divide down by 3. That means the top (15 teeth) will rotate 6 times and the bottom 5 times and everything will be back to the starting point. (15 x 6 = 90 teeth, 18 x 5 also = 90 teeth). I'm probably not telling you anything you didn't already know. :)

Part #7 is on the printer now and part #8 will be coming right after. They are the last two parts for me to print, and both are the second layer (connected to the top step part). I'm going to take your advice and build from the top down. Thanks! This has been fun. My previous most complex project was an iris box which I also enjoyed.

Word to the wise - the gear teeth on this thing are SHARP, i actually managed to cut myself on them ( i didn't even know that was possible on a 3d print lol).

I'm sorry. Maybe I should rename it... "The most dangerous pumpkin on Thingiverse!" or the "The bloodthirsty Gourd of Doom"... ?

But seriously I'm sorry that you got a boo boo. Maybe keep the pumpkin away from the kids and instead just give them a nice velociraptor to play with, it's probably more safe! (who knew?)

should it be possible to create an STL file with only one pin in it ?
I keep getting problems printing everything. It should be good if i have a file with one pin and a centerpiece separated...


I added a file with just two pins. The single pin was lonely.

FYI: these pins are part of Emmett's parametric (pins library.) [https://www.thingiverse.com/thing:213310]

Parametric Snap Pins
by emmett

Well, this is something really original, bravo! Mixing mechanical stuff with nature and Halloween, really great imagination! You could participate in challenge on this portal, considering the subject is Halloween: https://b2b.partcommunity.com/community/group/803/partcloud-net-weekly-challenge-2

The stem made me initiate a retraction calibration on this printer -.-
It's coming along! Thanks for the upload!

Comments deleted.

Wow, nice!
I just want to ask how did you split the unprintable .stl file into printable parts. I'm doing my own remix on emmett's heart gear, but after I exported the .stl file from OpenSCAD, I couldn't find a way to split the file into parts. Any tips on that?

Are you referring to the "assembled" versus "plated" versions of the geared model?

Yep, is there a way to export the plated version of the custom geared model?

Emmett has that in there you just need to know how to call the module.

Look for assembly and plate Then comment or uncomment out the lines you need:

I should make a video :)

Oh, silly me...
I completely overlooked the first few lines. I was just concentrating on finding a way to like hide individual parts and export only one part. Should've read everything from the start...
Well, I'm still a newbie when it comes to this. Your advice helped a great deal! Thanks!

Ok, so after all that... what did you make?

Comments deleted.

This thing is so painful to use hurts my fingers. The gears don't move very easily.

(Insert Evil Halloween laugh here) ... Can you post a Make so I can see how it turned out?

Love this gear pumpkin, do you have instructions on how to assemble?

No... but that is a good GOOD question. And one I think I have a nice solution for but didn't realize it until after I had finished hacking through the mash-up and already printed the model. It would actually be pretty easy I think to add markings for each piece and on the center octahedron but don't have the time to work on it.

I know that there are videos out there for assembling Emmett's 3D geared heart out there but I haven't watch them and it might make reference to shapes we don't have on the pumpkin.

What I did was put the top and bottom on first and then find an orientation for the 3 biggest pieces to be on the top half and then test fit (BEFORE PUTTING THE PINS IN) the 3 bottom half pieces.

Have you already printed the model?

I have printed the model. I have the octahedron in the tank dissolving some support that was left on it. It may be clearer once I have that part in hand.

I hate to say it... but I doubt it. :)

Maybe I can upload some picts of the model assembled?

that would probably be helpful!

Or how about this...
UPDATE: (2015-10-14_later same day) Added an UNPRINTABLE STL that is for assembly guidance only. It is a fully assembled STL rendering. Now you can rotate it and check it out. Better than the screen shots I think.

If you look closely you can tell which is which. Some of the lines on the pumpkin are closer to one edge or the other.

I just finished the Skull gear and was thinking what other shapes would make a good Halloween "thing-gear". Don't know why pumpkin gear didn't occur to me. Very nice.
Did you make any changes to the original scad with respect to the gears or did you just use it as is?

This is just a first run at it. (I don't always post unfinished stuff but since there was a chance I wouldn't' get back to it I decided to throw it out there/here, to the -verse).

To answer your question: I did do some scaling and positioning in there with but didn't mess with the gear code... yet. I have a couple of other things I want to try with this mashup but really need a first run print in hand to get an idea on which way I can take it next.

PS: Thanks, you've got some great work too.