Improving a Kids Mtn. Bike with 3D printing.

Needed new brake levers that fit a kids hand. Printed new brake levers that fit a kids hand.

[@joell439]

A Dad with a 3D printer is a super dad 👍😎👍

[@dimman77]

Awesome video. I love this rapid development and manufacturing that you do.

[@timhoover1416]

I love practical 3D printing to solve real world problems. Thanks for sharing.

[@semidemiurge]

you are doing dad right

[@VitaliySunny]

Cute :3

[@DennisMurphey]

I work on model trains could CF PLA be used for smoke housing that vaporizes smoke oil at 120c. Would annealing help. Dennis in Virginia

[@Antrim3d]

Great video buddy. Keep 'em coming! 👍🏻

[@CHZ-Tec]

The best achievements with 3D printing are in those types of achievements and even more so when it is for our children, well there. 😃👍

[@FEDGEZZ]

Dude, from experience, get a cut resistant glove when using a knife to clean up prints. I sliced myself pretty bad once when I didn't wear it (using a utility knife)

[@nbalagopal]

Great tip about minimizing distortion by taking the picture across the room. It's something I've been repeatedly messing up on while modeling. Thanks! I did not know about the PLA Carbon Fiber filament. Definitely getting one of those rolls. Have you used this in other things that are used outdoors? I've had PLA and ABS degrade and become brittle on things that I leave outside and have been using ASA. Curious how this PLA-CF would hold up over time in the sun.

[@DesignPrototypeTest]

Paint your prints with clearcoat. It will protect them from UV degradation.

[@sleepib]

When possible, I use a flatbed scanner for my CAD reference images. Only thing better would be a telecentric lens.

[@adamchambers7502]

Hey man. Consider doing a forced carbon version of this brake for your son! 3d print the negative mould and then pressure mould chopped carbon tow in there with a room temperature epoxy.

[@TheLermaJ]

I seen a guy just lay the object on his home scanner and print out a copy or work from the digital scan. Seemed really easy.

[@MetalGearMk3]

There is a new artist friendly CAD modeler call Plasticity, what do you think of it?

[@sald2of6]

Great job Dad!

[@chuxpie]

nice job

[@toalan]

Maybe the interior you print with CF-PC for strength and durability and the outer walls you use ASA. ASA and PC print near the same temperature, 260-280. You would have to run CF filament through the AMS which Bambu does not want you to do but does work. CF-PC prints with no warp issues on my X1C. Alternatively, PC blend type filament for the interior and ASA for the exterior. PC Blend filaments print without warp issues on my X1C. I have used the X1C+AMS for prints combining ABS, ASA, PC Blend, and CF-PC. There is also CF-ASA, I have seen it once but I forget where. Congrats on reaching 69k subs.

[@DesignPrototypeTest]

Outer fiber distance. Put the structure as far outboard as you can to maximize strength and stiffness. The carbon fiber PC you are talking about is actually a blend which is primarily ASA. 100% PC prints at 310° C in my experience.

[@toalan]

@@DesignPrototypeTest Pure PC has a temperature resistance of ~170C, PC blends typically have a temperature resistance of ~110C. The CF PC I printed on the X1C advertised 170C temperature resistance, I was able to print that using the default Bambu slicer settings of 280C, I was also able to print it at 260C-270C when doing multimaterial prints with ASA and ABS. The PC blends that I have seen are either PC+PET or PC+ABS. I have not seen PC+ASA but I am sure it exists. I was suggesting only the outer first or two layers be from ASA just to block UV. It might also be useful to stop the CF fibers from embedding itself into your hands. It happened to me once and it was a pain to pick it of my skin, but that was for a print that was not meant for being gripped with force routinely by a hand.

[@arva1kes]

how expensive aluminum have to be to be able to bend? It's always expected for aluminum to break . at least then doing it cold.

[@DesignPrototypeTest]

It didn't even bend 2° before breaking. I've had Shimano branded aluminum mountain bike levers bend 20° and then I bent them back straight and they still didn't break. The lower quality more porous casting using an inferior alloy makes the brake levers less expensive and more easily broken.

[@avejst]

Great design 👍😃

[@jacobrollins37]

Love this video

[@DesignPrototypeTest]

If only I got rewarded for making videos like this. Unfortunately, you are rare. Most people don't seem to care about this kind of content. Low viewership means no incentive. Thank you for the positivity though. I will make these types of videos from time to time when I feel like it. They are a labor of love.

[@jacobrollins37]

@@DesignPrototypeTest Just try to stay positive. Our family is the most important thing we have and seeing 3D printing enhance the time you have with your son is inspiring.

[@MisterkeTube]

What a refreshing video after just seeing one of your rants before. Keep this up!

[@DesignPrototypeTest]

I would, but this video only got a thousand views in the first 3 days. Everyone like you who claims they hate my drama but then that's all that gets watched. By the way, my drama is just a reflection/reaction to a vociferous group who thinks they should control the narrative around 3d printing? It doesn't come from me. I'm responding. Look at my channel. Three of my last four videos were just like this.

[@MisterkeTube]

@@DesignPrototypeTest I would blame the KZbin algorithm. I actually had to look at my subscriptions to notice that you had videos that I had not yet seen and hence why they then got into my watch later list in the inverse order. I do have to say that I never allow notifications from KZbin, but at least I would expect new videos from my subscriptions to get shown in the KZbin proposals, but no ... Anyhow, I love the more technical videos - even more those with technical explanations. That the views on those remain limited is unfortunate, but won't change my preference.

[@Simon-gk9ug]

Love it!! There's now a plethora of kids mtb stuff now, but as ever the bike industry gotta make a wholesome buck for this privilege 😢. How's the bamboo x1?

[@DesignPrototypeTest]

It's the most plug and play printer I've ever used. Also the most in line with Apple ethos. They are making it extremely easy for users at every level, but the hidden cost of that is the fact that they are gaining control behind the scenes in many ways. Most egregious is the printing through the cloud issue. I will continue to use it as my primary printer. It just works.

[@kennykd97]

Im glad you have gone back to making decent videos.

[@DesignPrototypeTest]

Come follow me on X/twitter if you want to see me, continue hating on Prusa. I will continue to stand against that mob until it disbands. It's almost certain that I will make another video or 10 on the subject. Also, you think this is a decent video but it only got 2.5 thousand views. I have 70,000 subscribers. I don't know what your definition of decent is but the viewership disagrees with you.

[@kennykd97]

And anyway being a parent is so rewarding should be y you enjoy making that video not viewercount

[@johnkim3858]

I am going to be negative here. FFF 3D-printed safety critical components might not be the brightest idea ever.

[@DesignPrototypeTest]

What makes you think my design is less safe than the aluminum one? You probably think "You can never be too safe" and therefore it's a guaranteed win to criticize based on safety concerns. It's not. But since you think you are the expert here and have identified a situation which endangers my son please tell me scenario where the printed plastic part in the hands of a 5 year old is less safe than the aluminum one. Especially given the fact that he now can keep two fingers wrapped around the handlebar and still bring the bike skidding to a stop (as demonstrated in the video). I'm surprised you aren't chastising me for allowing a six year old to even ride a bike. I probably shouldn't even let him out of the house. The outdoors are so perilous. Better to have him on the computer exposed to safety nannies and learning to program computers and play video games. There is no future for humanity in the open air.

[@hurzelgnurk]

@@DesignPrototypeTest First of all, I have to agree: becoming a dad is the best decision I have ever made. In this case I too have that voice that is drawing doubt if that piece will hold or endanger the user. Although I am pretty certain it will hold even in PLA I would have used PETG for the more ductile failure. Nylon would be the premium choice I guess. Please don't be so hard on people like johnkim, he is not totally wrong and was still polite, you drifted a bit into the rude and I don't like that although I am guilty of it too sometimes. Great job on improving the posture!

[@johnkim3858]

​@@DesignPrototypeTest ​ Yes, I pull the trigger with safety concerns. Admittedly, I don't know if the design is safe by looking at a screen. And I am not pretending to care more about it than you do, as I did not mention that the brake lever is on a kid's bike. Still, I would air on the side of the cushion, given that 3D painting is essentially multiple welds compared to casting, where the metal is molten and solidifies evenly, as you probably know-as I saw you talked about injection molded parts being more robust than FFF parts in some of your videos. I am not saying the part is weak because it is 3D printed. However, PLA has a reputation for having plastic creep, where the material gets deformed over time after expanding continuous loads, even under its yield point. CNC Kitchin had this with his 3D printer build when he printed parts with carbon fiber nylon (kzbin.info/www/bejne/noS6m5-casaBf7c). If the base material creeps, the reinforced version still does-the brake lever's hinges may loosen over time. What I saw in the video was: - the lever already on the being scanned - the brake leaver getting designed - the new lever getting put on a bike - asking your son how it feels - being done I saw more reinforcement around the hinge, which may improve the part's strength and stiffness. But in the process shown in the video, I have not seen structural calculations/simulations and-most importantly-testing the lever to failure to see how much load makes it structurally fail. Also, the idea of two/one-finger braking comes from mountain bikes with hydric disk brakes. At least for V-brake bikes made for adults, that lever is long enough to use three fingers. You could have researched and tested behind the scenes and concluded with that design before putting it on KZbin. But I have not seen it, and given that it is a safety-critical PLA part, it is not the brightest idea ever.

[@johnkim3858]

I made some spelling mistakes; here is the edited version: Yes, I pulled the trigger with safety concerns. Admittedly, I don't know if the design is safe by looking at a screen. And I am not pretending to care more about your son than you do, as I did not mention that the brake lever is on a kid's bike. Still, I would air on the side of the caution, given that 3D printing is essentially multiple welds compared to casting, where the metal is molten and solidifies evenly, as you probably know-as I saw you talked about injection molded parts being more robust than FFF parts in some of your videos. I am not saying the part is weak because it is 3D printed. However, PLA has a reputation for having plastic creep, where the material gets deformed over time after experiencing continuous loads, even under its yield point. CNC Kitchin had this with his 3D printer build when he printed parts with carbon fiber nylon (kzbin.info/www/bejne/noS6m5-casaBf7c). If the base material creeps, the reinforced version still does-the brake lever's hinges may loosen over time. What I saw in the video was: - the lever already on the bike being scanned - the brake leaver getting designed - the new lever getting put on a bike - asking your son how it feels - being done I saw more reinforcement around the hinge, which may improve the part's strength and stiffness. But in the process shown in the video, I have not seen structural calculations/simulations and-most importantly-testing the lever to failure to see how much load makes it structurally fail. Also, the idea of two/one-finger braking comes from mountain bikes with hydraulic disk brakes. At least for V-brake bikes made for adults, that lever is long enough to use three fingers. You could have researched and tested behind the scenes and concluded with that design before putting it on KZbin. But I have not seen it, and given that it is a safety-critical PLA part, it is not the brightest idea ever.

[@yeroca]

@@johnkim3858 air->err

[@cycleistic1365]

Have to admire the effort, but FYI there are also stock short reach brake levers for children's bikes.

[@DesignPrototypeTest]

Didn't want to wait for delivery.

[@snax_4820]

Did you print it on a Prusa printer?

[@DesignPrototypeTest]

Yep. Josef is making this fantastic new machine. They ship it from China under the white label name "Bambu Lab X1C" It's really a good machine and knowing that Prusa actually designed and manufactured it instead of some unreliable Chinese brand with a questionable design staff just gives me all the confidence I need.