Wobble Seat




Introduction: Wobble Seat

About: I build, I teach, I learn. Happiest when covered in saw dust, sweat and machine grease. Visit CobyUngerDesign.com for more projects and info.

Sitting all day is bad for your health. People with sedentary jobs have a much higher chance of heart disease than those who move around more. The wobble seat provides a solution similar to the Locus Seat deigned by Focal Upright Furniture (www.focaluprightfurniture.com) without breaking the bank.

This seat should be used with a stand height desk or drafting table. (Note the tabel in the first photo of the seat in use is not quite high enough, sorry.)

Step 1: Materials

Step 2: Cut

Step 3: Mix

Step 4: Pour

Step 5: Level

Step 6: Bolt

Step 7: Use

5 People Made This Project!


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69 Discussions


2 years ago

Great Job and Very creative! I like where your head is at.

Thinking through the traction issue on the bottom. I am going to try shoe goo. it is supposed to very durable and add months of life to shoes and other products. Just getting it smooth with a Popsicle stick would be the key so you don't have any ribs to prohibit movement. I'll post pictures after I make it... soon!

1 reply

Sounds great! I look forward to seeing your version.


Here's mine.


You might consider leaving the basket ball form on instead of trying

to coat the concrete,

good traction and during basketball season all will think you cool.

Images of wobble seat with the adjustable height desk I made out of a hydraulic printer stand and some plywood.

photo (1).JPGphoto 1.JPGphoto 5.JPGphoto 4.JPGphoto 3.JPGphoto 2.JPG
1 reply

That looks fantastic. Nice job! I promise it will be much better with a real seat on it. The one I used costs about $15 from Walmart. The noseless bike saddles work better than a traditional style seat. I have been casually looking for a tractor seat for mine. That would be ideal.

Thanks for posting this! I just made one of these little dudes last night. came out really well. I ended up cutting a basketball in half and inverting one side into a metal mixing bowl (that just happened to fit perfectly) to help it keep the nice flat bottom I wanted. Worked great. I also took someone's suggestion in the comments and put 4 carpentry screws through the basketball to tie the ball to the concrete. I still need to find a better seat (hoping to find a free old cruiser bike seat), but this works surprisingly well for now.

This is totally awesome! I hope you have a patent (or a pending one), you could really cash in on this. I haven't seen something so unique, so cool, and even beneficial in a very long time. You should be very proud!

3 replies

Thank you so much for your comment. I am not planning to patent this one. Focal Upright Furniture makes seat similar to this one that probably holds some restricting patents. This design is for people like me who can't afford their awesome products but would like to enjoy the benefits.


Darn! That's too bad! I've never seen anything like this and I think it's amazing! I'm with you, I'll make it before I'll pay that kind of cash! I had my desk at work lifted so that I can sit or stand due to a couple of back surgeries and I'm going to try to make this one for sure! I'll send pics when I'm done.....gotta figure out where to find a crutch. :o) Thanks for sharing your skills with the rest of us....you did a fantastic job!

If you do make one first read some of the comments below. Casting the concrete base in a basketball was a fantastic idea and makes the base stick to the floor better. If you can find something slightly bigger than a basket ball it might be even better.

Thanks again for your appreciation.

This ought to be one of the best projects here on Instructables. Simple instructions anyone could follow, readily available materials, very basic tools but a very innovative and useful product. Cheers!

1 reply

(Preface: Instructables won't allow me to 'reply' because of a Captcha bug. So, I have to post a new comment every time.)

Here are 2 pictures.

Looking forward to seeing your standing desk. I'm also working on converting my computer desk to have an adjustable height. I can also share a picture of that when it's done.

1 reply

That looks great. It's so much fun seeing people make things I designed.

Thanks so much,


I also used an inside-out basketball but the weight of the concrete conveniently flattened the very bottom of the hemisphere, creating a ~5" diameter flat plane. So, it has no problem staying upright when not in use.

I didn't use water or sand as was suggested by others. The ball was able to maintain it's shape aside from the added bonus of the flat I just mentioned.

Thanks for sharing this great project.

1 reply

I'm so excited that you actually made one! would you please post a photo? I would love to see how it turned out. If all turns out as planned I will be making a desk to match in the next few months and will post instructables on that too.

I like the idea, in fact I wish I'd had a couple in my lab when I was in IT support.
The only thing that concerns me is that on some floor surfaces it could be prone to sliding away, I would hate for all the health benefits to be cancelled out by sudden & painful contact with the floor :-(
Perhaps some anti slip covering suitable for the surface it's to be used on would be worth considering.

2 replies

I tried PlastiDip but it doesn't stick very well to the concrete and tends to get dusty. If you have a good coating suggestion that would be great. That is definitely something I want to address with future versions. The concrete as is works best on carpet.

What if you lined the mold with a cut open basketball? might take some creative cuts to get it to lay flat in the mold.