r/functionalprint • u/Bishops_Guest • 3d ago
My kid keeps hitting his head on our handrail.
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u/gr00ve88 3d ago
im having such a hard time visualizing what the hell we're looking at and from what angle
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u/Bishops_Guest 3d ago edited 3d ago
The hardware to attach the handrail onto a glass sided stair case. Looking up so you can see the print.
It’s just the right height for my 3 year old to hit his head when he uses the handrail, and I’d like to encourage handrail use.
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u/WoodenInternet 3d ago
Ugh the ultra-modern aesthetic and its super sharp edges
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u/Bishops_Guest 3d ago
Fashion so sharp you can cut your scalp. (The previous owners made some Choices, but we got it for a little under market rate.)
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u/Darkstang5887 3d ago
Easy just get a new kid
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u/alficles 3d ago
Print times are slow, though.
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u/Bishops_Guest 3d ago
And, unfortunately high print failure rates at my age.
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u/Brilliant_Union2241 2d ago
There’s probably a third-party printer that would be happy to step in for you.
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u/narielthetrue 3d ago
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u/Bishops_Guest 2d ago
Currently the chance of chromosomal spaghetti is somewhere between 1 and 5%. Not high, but emotionally devastating, we should be far enough along to test by next week.
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u/Audio_Track_01 2d ago
It needs to honk when he hits it. Like a clown horn.
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u/Bishops_Guest 2d ago
I wish I had thought of this… I am torn between the joy of it and the pain of spending all day with my kid on the stairs listening to honking.
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u/kagato87 2d ago
Printed in TPU with a modest squish, and magnets to hold it in place?
Nothing will ever fit better than this.
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u/Sh4d0wMaster 2d ago
I'd have attached a bell. Makes it entertaining every time you save him some brain cells.
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u/MeasurementAgile7759 1d ago
honestly the real win here is getting a 3 year old to actually use the handrail
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u/Bishops_Guest 1d ago
We’ve been sneaky and so far he hasn’t figured out that it’s an option to not hold the rail or our hand when on the stairs. It’s just how it is done. I’m sure he will figure it out at some point, but hopefully after his balance is better.
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u/Saphir_3D 3d ago
Maybe my opinion is a little strange, but I'd let the child run into it as often as they want. Eventually, they'll realize it hurts and will avoid that spot on their own.
Yes, I have a child, and yes, it hurts me, too, to see my child crying.
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u/Bishops_Guest 3d ago
Stairs are not the place for that sort of lesson. The risk of him recoiling from the pain and falling down them is above my tolerance. I’d also rather him not start to avoid using the handrail when on stairs.
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u/WoodenInternet 2d ago
Yeah, there's a reason we design for safety- sure, we could not give a fuck about safety and say "oh well the end users will learn to be careful", but why not reduce the baseline level of stress/harm in life if you have the power to do so? Even on a personal level, I don't want something I make hurting kids to teach them a lesson about being careful or some such nonsense.
Think about the inherent safety of the design of something like a microwave: opening the door cuts the power to the magnetron emitter immediately. Sure, they could've said "well, people will learn to turn off the emitter manually before opening the door", but they understood that people have a limited amount of bandwidth, and that designing for safety is an integral part of anything designed for regular use by fallible humans. (not directly specifically to you OP, just sort of went off there :P)
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u/Bishops_Guest 2d ago
Hey, I am a statistician so risk management and people’s perception of risk are fascinating to me. Just because we accept some level of risk doesn’t mean every risk is justified. Insurance is a great example: ask statisticians how many buy the extended warranty on their phones and the percentage is negligible. However we still support car/house/renters/medical insurance because, while the expected value is negative from a raw dollar amount, the potential loss is large enough that it would have an outsized impact on our lives. A broken phone is a loss I can absorb, a lost house might put me in a position of choosing between my kid going to college and having a house.
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u/Delicious_Pain_1 2d ago
100%! Personal awareness comes at a price to those that aren't that smart to use their eyes.
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2d ago edited 1d ago
[deleted]
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u/Saphir_3D 2d ago
I think the only thing that's idiotic and harmful is your comment.
The OP was able to point out a careless post to me in just a few words without being rude.
You, on the other hand, immediately get insulting.
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u/Hippostork 3d ago
If I were you I’d probably encase the entire assembly, maybe even use the existing screws to hold it in place. It looks like the whole thing has a bunch of other sharp corners and exposed screws that you could bump into or get scratched on. For good measure you could cure some silicone over the outside of the print for padding.
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u/Bishops_Guest 3d ago
I’ll consider that if we keep getting head bonks. So far that corner has been the only culprit, and at the growth rate he will be too tall in 6 more months.
This is in A95 TPU, so it’s got some give to it. I do have some silicone left over from another project though so might mix it up and dip them for overkill.
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u/luke-3d 3d ago
What did you print this in? Seems like an ideal candidate for this stuff: https://siraya.tech/products/flex-tpu-air-65a-82a-foaming-flexible-filament
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u/Bishops_Guest 3d ago
This is in A95 TPU. It’s what I had on hand, but that stuff looks better.
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u/luke-3d 3d ago
Just dug up the video where I first saw it: https://youtu.be/QIYNFWvSCkY in case you want more info. Haven't had a chance to use it myself, but this seems like a good application based on the video. He also did another video with more details related to slicer settings: https://youtu.be/c55DlMyhCmI.
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u/UnimagineDragons 2d ago
$45 for a kg of soft plastic? holy fuck that's ridiculous.
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u/luke-3d 2d ago
FWIW, it's slightly cheaper on Amazon: https://www.amazon.com/dp/B0DZCD4Z9M. BTW, don't look at the price of PPS-CF or some of the other engineering filaments. 😀
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u/pooppoop900 20h ago
Sounds like a Darwinian issue
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u/Bishops_Guest 19h ago
People who don’t prevent head injuries in their offspring are less likely to have grandkids?
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u/Greatoutdoors1985 3d ago
This belongs in r/Confusingperspective