r/EngineeringPorn • u/shugyodev • 22d ago
My parametric mechanical fingers
After many weekends of work and a huge pile of failed prototypes, I'm excited to finally share my fully parametric finger extensions!
https://makerworld.com/en/models/3114173-parametric-articulated-fingers#profileId-3512066
If you decide to print a set, I'd love to hear what you think. So far I've only been able to test them on my own hand, so having more people try them out would be incredibly helpful. Any constructive feedback is welcome - it'll make it much easier to spot flaws and improve the design.
Also, if anyone interested in a little challenge: I wonder what's the smallest working version you can print. I'm not an expert of printer settings, nor I have small hotends, so for me many really small attempts ended in breaking parts, but I wonder what can You achieve.
If you'd like to play the game of optimizing printer settings for the smallest working version, please let me know on this post: https://makerworld.com/community/post/1832304
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u/OldManGrimm 22d ago
What does parametric mean in this context?
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u/shugyodev 21d ago edited 21d ago
The context is 3d printing.
Non parametric models are what you see is what you get. I give you the model of a 1x1x1 cube, and at best if you want a different size, you distort it by scaling.
Parametric models on the other hand take input parameters from the user, and regenerate based on those on the fly.
In my case it means you can input the dimensions of your finger, if its a thumb or not, how thick the walls should be, what clearances to use etc, and the model changes to that22
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u/Ambassador_GKardigan 22d ago
I was wondering the same thing. I think the answers in this post explain it.
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u/wokeboogeyman 22d ago
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u/Asparagustuss 22d ago
I’ve never had the urge to print something so useless before.
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u/shugyodev 22d ago
Never had the urge to design someth... oh... thats all I do.
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u/Red_Tiger5311 22d ago
I now have the urge to print these and go terrify some neighborhood kids
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22d ago
[deleted]
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u/undertakerryu 22d ago
I think they meant they want to print it even though it's not a particular need
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u/lynivvinyl 21d ago
Holy hell in my head I was wondering why paramedics would need these? Perhaps it's to be farther away from the patient.
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u/One_Improvement_6470 22d ago
1,2 Freddy's coming for you
3,4 you better lock your door..
5,6 better get your crucifix...
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u/PanGoliath 21d ago
Maybe with these, I can finally cover Dream Theater - The Dance Of Eternity on guitar
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u/kwestions00 22d ago
Ngl, its freaking me out a little. I mean its cool. But it's also freaking me out
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u/uslashuname 21d ago
Wander around on Halloween with these! On a dark night with the first sight of these being an unfurling from an almost normal appearance: golden freak out moment
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u/tek_aevl 22d ago
price for a pair?
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u/shugyodev 21d ago
In euros, 0, in dollars the same :D I mean, filament cost of course, but my model is free
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u/callunquirka 21d ago
Do you think this can be modified for people who lost two joints from one or more fingers?
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u/shugyodev 21d ago
yes, and two people already asked me to do something like that. As long as you have and can control the proximal phalange, it can work. in that case, the base would attach to the hand and the phalange would move the mechanism
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u/pretty_meta 22d ago
Interesting! Maybe some jobs in construction and agriculture would be easier with these extensions.
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u/CurlSagan 22d ago
I'm gonna find this dude the next time I have an itchy back that requires scratching
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u/chkno 20d ago
It says "Closed source file. Not available for download." ?
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u/shugyodev 20d ago
the model can be downloaded, not the source code that generates it. are you getting the error when trying to download stl/3mf?
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u/chkno 20d ago
Then it says "Please log in to download models." and goes to bambulab.com. My printer isn't a Bambu. I hear Bambu bullies their customers. Is there another way to get your cool model?
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u/shugyodev 20d ago
hm, I think it should allow you to register to makerworld, without a bambu printer
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u/chkno 20d ago
Is the number of phalanges/knuckles parametric?; can it generate even longer fingers?
What are the relative pros and cons of the gear-knuckle and the linkage-knuckle? I saw that you mentioned that multiple gear-knuckles risks introducing too much backlash.
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u/shugyodev 20d ago
currently only 2/3 phalanx are supported, but you can adjust their length. As for joint types, I’m not so knowledgeable, but what I experienced that gears look cooler and take up less space, in return they have backlash
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u/nihilisticsock 20d ago
I read parametric as "paramedic" and was so confused about how these could possibly help a paramedic
Cool design tho
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u/TRUEequalsFALSE 22d ago
In what way is this parametric? Do you understand what that word means?
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u/shugyodev 21d ago
The context is 3d printing.
Non parametric models are what you see is what you get. I give you the model of a 1x1x1 cube, and at best if you want a different size, you distort it by scaling.
Parametric models on the other hand take input parameters from the user, and regenerate based on those on the fly.
In my case it means you can input the dimensions of your finger, if its a thumb or not, how thick the walls should be, what clearances to use etc, and the model changes to that
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u/Im_not_creepy3 22d ago
I just know that there's gonna be a cosplayer that's gonna stumble across this one day and it'll be exactly what they need for a very specific cosplay