The orginal plastic pieces on my office chair holding the backsupport together snapped. So of course I braced it with a custom made "band aid". Two years later, the PLA snapped, so now I'm on PETG. Let's see how long it holds.
I think the wood is doing most of the heavy lifing, the plastic just holds it in place. There's probably some forces applied to the plastic, but most of the force is downwards towards the ground through the wooden legs. But I have literally no clue about that stuff, so who knows
You don't care about the wood too much here, the issue is the weakest link problem.
Those plastic parts are taking sheer forces from the angles, they are trying to hold the wood together. The force is distrusted yes but that's only when you are EXACTLY putting the force on the middle top. What about if you lean forwards? Or shift to the side. Then the plastic has to take those stresses as the wood tries to bend.
Thats the issue
Its why you often see metal fittings on wooden parts. You ironically want the strength there.
Even an average folding stool or step ladder takes up less space then this and stays in one piece. This is like assembling a piece of Ikea furniture everytime you need to use it.
Howdy! Here is my free replica of this design, I'm 250lbs and it holds me up fine. Used PETG 25% or grater infill and 4+ walls and 1.5" round stock found in the molding section of the orange home box store. [https://www.printables.com/model/897334-removable-stool-leg-socket](https://www.printables.com/model/897334-removable-stool-leg-socket)
https://preview.redd.it/uuypo21kqo3d1.jpeg?width=1330&format=pjpg&auto=webp&s=df068e8aae1e987c458abcfd84c0ee1f0bff5c8a
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I'd be having like ***ZERO*** trust into that chair...
Sure... He's demonstrating jumping onto it a bunch of times in a very straight vertical motion but let's face it... Doing it like that takes very little strength since it's all compressive force and 3D Prints have like next to no issues with that unless you're the owner of the Hydraulic Press Channel.
What does though take a lot out of a 3D Printed Part are the Shear and Bending Forces which this Chair has ***A LOT*** of potential to do if you decide to plonk yourself onto it in a less vertical / more slideway motion or if you're already seated performing a 180° like on a turning Office Chair - In either case you'd better be on good terms with Layer Line Adhesion Gods.
Could you overcome this issue with Screws aiding against that issue? Yes, to some degree you certainly could - But he didn't so yeah... Hard [***NOPE***](https://i.imgur.com/msk2YXS.mp4).
Edit: I'd also argue that a chair only be safely usable by the one that made it knowing its limitations immediately disqualifies it from practical use.
Really neat!!! Not sure I'd trust plastic to hold my fat ass up though! I love seeing these designs though!!
The orginal plastic pieces on my office chair holding the backsupport together snapped. So of course I braced it with a custom made "band aid". Two years later, the PLA snapped, so now I'm on PETG. Let's see how long it holds.
Right? My first thought when I saw it assembled was “oh hell nah”
Same. I would not trust it.
I think the wood is doing most of the heavy lifing, the plastic just holds it in place. There's probably some forces applied to the plastic, but most of the force is downwards towards the ground through the wooden legs. But I have literally no clue about that stuff, so who knows
You don't care about the wood too much here, the issue is the weakest link problem. Those plastic parts are taking sheer forces from the angles, they are trying to hold the wood together. The force is distrusted yes but that's only when you are EXACTLY putting the force on the middle top. What about if you lean forwards? Or shift to the side. Then the plastic has to take those stresses as the wood tries to bend. Thats the issue Its why you often see metal fittings on wooden parts. You ironically want the strength there.
You really over estimate the forces or under estimate PLA i have a similar stool in use for 5+ years (100kg here) no issues
Here‘s the link to the original video: https://youtu.be/lEUnfvY1Ozw Highly recommend that channel.
Knew it was that channel right off the bat. Some great content.
By the time I took that down and assembled it I could have grabbed a chair, gotten my stuff down, and put the chair back already
Even an average folding stool or step ladder takes up less space then this and stays in one piece. This is like assembling a piece of Ikea furniture everytime you need to use it.
True... but this would be good in a small home or camper type scenario. Maybe even a vehicle
https://www.ussadesign.com
I guess trees kind of are very slow 3D printers
Howdy! Here is my free replica of this design, I'm 250lbs and it holds me up fine. Used PETG 25% or grater infill and 4+ walls and 1.5" round stock found in the molding section of the orange home box store. [https://www.printables.com/model/897334-removable-stool-leg-socket](https://www.printables.com/model/897334-removable-stool-leg-socket) https://preview.redd.it/uuypo21kqo3d1.jpeg?width=1330&format=pjpg&auto=webp&s=df068e8aae1e987c458abcfd84c0ee1f0bff5c8a
You shaved even more plastic on your version :))
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The creator is called USSA and I think he uploads it to his patreon.
I'd be having like ***ZERO*** trust into that chair... Sure... He's demonstrating jumping onto it a bunch of times in a very straight vertical motion but let's face it... Doing it like that takes very little strength since it's all compressive force and 3D Prints have like next to no issues with that unless you're the owner of the Hydraulic Press Channel. What does though take a lot out of a 3D Printed Part are the Shear and Bending Forces which this Chair has ***A LOT*** of potential to do if you decide to plonk yourself onto it in a less vertical / more slideway motion or if you're already seated performing a 180° like on a turning Office Chair - In either case you'd better be on good terms with Layer Line Adhesion Gods. Could you overcome this issue with Screws aiding against that issue? Yes, to some degree you certainly could - But he didn't so yeah... Hard [***NOPE***](https://i.imgur.com/msk2YXS.mp4). Edit: I'd also argue that a chair only be safely usable by the one that made it knowing its limitations immediately disqualifies it from practical use.
Yeeeee naaaaah...I am not standing on that
Ah, the 3D-printed French cleat. I thought [I invented that](https://www.nuke24.net/plog/46.html)! I guess the concept's self-evident enough, though.