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Hi! I've been driving hobby-grade RC cars for 5 years and 3d-printing for 3 so here's some tips: 1. You're right, those are definitely not the right tires for 100 MPH, they are made for a short course truck. They also experience ballooning (which is what happens when the centrifugal forces expand the tire) which caused them to fall off the rims. And yes, they should be glued to the wheels, 99% of rubber tires for RC cars have them glued. For speedruns you would use either foam tires (which have more grip and are lighter, so they don't experience balloning) or belted rubber tires. 2. The transmitter you're using is okay but it's not really meant for RC cars. It's much more comfortable to use a "pistol" type transmitter (for example a Flysky GT5, which you could use with the receiver you currently have. 3. The top speed of an RC Car isn't magic and can be easily calculated. With your setup (6s LiPo, 108mm tires, 10T pinion, 50T spur, 1000 KV (motor RPM per Volt) motor) you could theoretically reach 102.6 kph or 63.37 mph, thats assuming 100% efficiency. The formula for this car (direct drive transmission) is: [((KV*nOfCells*4,2)/60)*(pionionT/spurT)*(Pi*tireDiameter)]/1000*3,6. If you wanna convert it to MPH just multiply the result by 0,62. 4. Unless you have a perfectly smooth surface (like a strip of highway that's about to open) then you need good suspension, that is springs + damping. While the springs make the suspension "soft" or "hard" the dampers are used to make it less bouncy. You can try different hardness springs and viscosities of oil inside the shocks to tune it. 5. Despite what many people say the aerodynamics of RC cars are important. Things like spinning tires generate a lot of drag so it's best to cover them under a body. I'd look at both racing car bodies (from Protoform or Bittydesign) and speedrun bodies (Deltaplastik) and try to design something similar. There is also a lot of stuff to consider about the suspension setup like caster and toe but with 3D printer tolerances they're less important than the things I mentioned. If you'd like to ask about something, I'd be happy to help.

Some suggestions in no particular order: - Design it to have adjustable toe. Toe-in would help a lot with stability. - Put a good sized vertical fin from around the center to the wing, like the ones you see on 2017 Formula One cars. This would increase straight line stability by increasing the resistance to yaw and steering changes. - Adjust the steering input to be speed-sensitive. For example: steering output = steering input / speed. Or something to that degree, whatever works best in testing. - Your suspension - especially the rear - is probably adequate in travel and spring force, but probably inadequate in damping, if those shocks even have real dampers on the inside. Those bumps are making the rear bounce and turn, forcing the front to go that way, which causes it to flip. - Increasing overall downforce would also help stabilize the car, and make it more resistant to direction changes from caused by bumps.

Wow super cool that you were able to use my design as a launching point for your project. Great video keep it up. Some will tell you it’s not possible but I was told designing the Tarmo5 with the current specs wasn’t possible by a lot of people on the internet. I am sure you can make the design a lot better!

You need a smoother surface.

A couple years ago I started down the same project 100mph 3D Printed R/C car.... I started looking at the available R/C car models and prints ultimately started designing my own. Seeing what you have accomplished I will have to start that up again.

your channel has quickly become one of my favorite 3d printing channels! love the way you're always seeing what is possible with 3D printing.

An aerodynamic shell and some more weight or wider tires could give you the stability to reach 100 maybe. Gonna be a fight between friction/drag and stability I think.

Thanks for the universal vs CV joint comparison. This was helpful.

I'd say you should get FPV camera + goggles and it will make your driving much more accurate immediately. Also adjust the max steering angle to be less for high speeds: either strongly non-linear control if you can avoid going to the sides during sudden movement or actually limit the steering angles similar to gaming console racing games typically do it.

Nice video! Love to see RC content. Foam tires will help, the ballooning hurts performance quite a bit. Also, instead of using two shocks, use one but grab stiffer springs and use thicker shock oil. A proper rc car remote is a must too, it's much easier to control. And a better road will improve stability too

-Belted tires so they do not balloon -A body for aero dynamics, at 35mph aero drag increases to nearly rolling drag and air resistance scales with size so it is for sure a factor

Instead of installing more shocks try using stiffer springs and also use a low drag body

That redesign looks sick as hell. Well done on the improvements!

This just showed up in my recommendations and I'm glad it did! I look forward to seeing the play out.

I would personally recomend a "castle sidewinder" motor as they are stupid powerful even at 3s, also add another motor to the front and make it 4wd, it will be much more stable!!

Having a pistol grip transmitter will definitely make you feel more comfortable going at high speeds. I would say find a cheep Traxxas style rc and just get use to bashing it around and comfortable driving. Having a gyro compensate is fine but only after getting use to driving it plane. Also be careful of oscillations at high speeds from over compensation. I cant believe how well the printed car held up after that crash and I am so looking forward to seeing you hit +100mph. Best of luck!!

You are right about the Universal joints creating that sine wave type motion. However if you have two (the exact same way the CV joints are setup) they actually cancel each other out completely removing the oscillation. That is why any production RC car the buy uses universal joints and not cv joints.

solid rocket motor on the back ;)

I tried to make my own cv joints that were 3d printed for my rc car but they kept breaking

The reason your car was spinning out mainly was due to the tires. Even when you are driving on flat ground, the tire still rounds out the faster you go, making your contact patch smaller and smaller. Almost like your tires are turning into bicycle tires.

This is just the project I was looking for! I just started printing a 3d printed dragster for MRRF 2023 and am looking forward to seeing how fast I can go. I'll be keeping my eye on your journey to 100MPH!!

1) you might need to lower the car and run on a flatter track 2) limit or make a limiter of your down droop travel so it doesn't bunny hop as much 3) enclose with a body to reduce drag and wind resistance which might cause it to lift and flip up 4) create a down force for front and back 5) turn up the punch in esc to highest (increase acceration) also check gearing as well - don't run out of runway if you geared too low 6) run on a lower turn motor (like 4.5T) 7) avoid turning turning your wheels as it would make it unstable in high speed

Honestly you just need some foam tires, sway bars and less suspension travel. Also needs way more power. But you should not focus big on aero, you just need a wing at the back to keep it straight, but at 100mph you mostly just need power

Awesome! I've built the tarmo 3 and 4. Now I am going to try your version of the 5!

I think the number one thing you can optimize is the gear reduction, if you manage to get the amp draw the motor with the current setup at diferent speeds you can get a idea of the power/speed curve and estimate the max speed you can hit with this motor (his max power) then adjust the gear ratio to hit maximum voltage and current at this speed (migh differ a bit from theory, but it would be great start) , also try using gears with number of tooth that are prime one with another (=>1 is their only common denominator) to prevent premature deterioration

Awesome video! Subscribed and looking forward to see part 2 :)

Can you post the STLs and BOM list? I like your design and will definitely make one. I would suggest getting the batteries as low as possible to lower the center of gravity. Also look in to either metal gears, or print them form better materials, at least abs or higher temps. Also lube them up! Great build

You just got another subscriber. Really cool project, I've seen many or most 3d printed cars, but this somehow feels better and more awesome. Great video! ❤

I love that this design uses outrunner motors. They are so much torquier and hence require less transmissoin. Or even none. I've built up a 1hp/kg RC car with 4x hub motors and it turned out a blast

I'm really impressed with your design, I am quite good at designing individual parts but the process you went through to design something this complex with so many individual parts baffles me. If you could create a video on how you went through this process would be amazing, or do you have any advice on how I could learn to do more complex designs like this? Thanks

Other than a smoother surface, you may want to soften your suspension as a common reason for losing power at speed is that the bumps lift your wheels. You may also want to lower the car as to lower the centre of gravity. Adjust your front wheels to some Tow-In, probably about 1 degree. This is not so great for cornering but offers stability in straight lines. Finally, look at adding a shell of some kind. This is primarily for aerodynamics. When you hit those speeds, wind resistance becomes a real factor and especially so if your chassis has areas which are either asymmetrical or potentially look to raise the car off the ground.

I would suggest that you make a 2 motor configuration to make more power. It would also be helpful to try and make a rear wing for a bit of down-force on the rear end which will help the car to grip and go faster.

This is awesome! I also went down the rabbit hole of 3d printing RC cars and ended up redesigning a traxxas rustler 2wd, reusing the gearbox and drivetrain to create my own 3d printed speed demon. It’s got some reliability issues especially since i run it on 8S, and it’s gotten up to 60mph so far but I’m aiming for 100+. Gearbox is the main issue ironically. This video has got me thinking about doing a more custom build with printed drivetrain parts and such. A couple things you should do: buy a set of Hoons or GRP tires, lock the front suspension with a nice, ductile nylon or TPU filament, and lower your center of gravity. Make the wings a higher angle of attack, at this size a flat plate performs relatively efficiently compared to an airfoil. Get a much bigger inrunner motor, and make sure it’s rated for your ESC’s power output while providing adequate torque. These are all things I did and my car runs awesome on a good surface. Great work!

As an enthousiast of Rc speedrunning and recent Bambu X1 carbon (& PAHT-CF) owner, you got me inspired. Some tips: 1. Do really get a surface radio (you'll not need the gyro anymore) Control will feel way more natural. 2. Tyres are everything. There are only a few brand offering foam tyres that can do 120+ reliable. Rubbers give more grip and only a few will do so. Grap yourself some GRP GT-sized wheels. 3. Aero will reduce demand for power. But most lack of aero can be solved by power up to 100mph. You will certainly end up with a 4092 inrunner and a bigger ESC which doesn't limit your amp draw. Batteries (max amp draw and voltage sag) will be the next bottleneck. Do some research on "true C rating" 4. Stiffen up your suspention. Definately the rear.

thank you. I thought only thingiverse existed till now. I've checked Printables, and it's awesome!

Universal joint can give you a constant speed but you need two of them. Your suspension is build in the way that the inner shaft is ALWAYS parallel to the wheel shaft. So if you put two universal joints, the will cancel each out. On the test stand you have only one "bend", so the rotation has oscilations, but if the shafts of the gearbox and the wheel are paralell then two oscilations in the universal joints has opposite phase.

Awww yeah! Challenge accepted :)

Im making an rc car in my shop class with a brushed motor and low power traxxis components. It probably makes a bit less than 1 horsepower and doesnt have suspension, but i got it up to 40 mph on my schools track. It was previously capping out at 30 mph, but the addition of a simple cardboard aerodynamic body made it jump 10 more mph. In conclusion, you could add a body to make it way faster.

This chassis is amazing and your mods are awesome ! pretty good work I'd install roll-bars front and rear, lower the suspension and make it as tight as possible as well as replacing those 3D printed links for the steering with nice adjustable ones ;) Ah, I almost forgot ! Race tires ! Damn !

Suggestion for easier steering: reduce the maximum steering values proportinally to the car's speed. That way you have way more control of the car at high speeds, as even a large rotation of the steering will only steer the car a little to the side

Very nice work. I was dreaming to have this kind of project decades ago. Now there are 3Ds and since that, I believe things can make it highly possible. I would suggest to put in dynamic shock absorber, differential drive and brake system by making individual motors for each wheel etc. to overcome flip and increase stability.

things to try 1. toe in front n rear 2. positive castor front 3. downforce 4. dial in some exponential on yr remote 5. even longer wheelbase

AWD is going to be essential for stability at high speeds. Also, make sure you have high quality shocks with adequate weight RC shock oil in there. Super cool project, glad I found your channel!

1. Off road tires are designed for that purpose, and they are generally not designed to be fast. To go fast and stable you need the smooth, soft, and sticky tires to bite the ground. 2. It's too light, and the center of gravity seem to lean toward the tail, a tail heavy car will do that at high speed because once the speed picks up, and front is light, the front will try to lift up due to increased power and torque, even tho very minor, it will cause the loss of traction, and once the front loses traction, the rear will start to lose guidance and veer sideways. 3. The closer the center of gravity to the ground the better for high speed stabilization. Use smaller tire, or lower the car. With that big tire the car will wobble at high speed. Imagine the setup for F1 or Nascars. That's the kind you want for high speed and stable. 4. Aerodynamic isn't that relevant unless you go over at least 100 mph (for stabilization purposes). Fins, wings, spoilers, all the bull crap is not needed.

I think reducing the suspension travel and moving to stiffer springs would help with stability. Also it would be good to look into foam tires, which are what a lot of the rc speed cars use.

very nice and can not wait to see where you go from part 1. I would try to enclose or at least reduce the drag that the compartments cause. It might not be much but every little bit can help.

I want more of this RC car man! Good Stuff!

AS A CAR GUY, STRAIGHT CUT GEARS ARE OVER THE TOP

1:14 it's regardless. Man that's my biggest pet peeve. Irregardless is not a word.

I have wanted to print my own car for a long time. This definetly is a cool project.

Amazing video! Can't wait to see more.

tire blow off was priceless. As a guy who had MANY RC cars using glue on tires is a must for traction and staying on rim lol. This thing is pretty damn cool too! Cool video bud

Haven't seen it in any of the comments, but in the 49mph run the wheels are starting to expand, it probably loses a ton of traction when the wheels expand like that.

as RC modelar this was amusing to watch:D The rookie problems united in one go:D haha, you did well!:)

you might want to be careful when going at higher speeds with a gyroscope because you can get unwanted oscillations AKA fishtailing and completely loose control of it. also to avoid excessive tire ballooning you can wrap some fishing line between the threads on the tires or go for some foam ones. good luck and Godspeed!!!

Great job man, that thing ended up driving better than a brand new one I just bought lol. There are a ton of little details and caveats to good steering and control but somehow a 3D printed deal like this handles it all really well for what it is. I recommend some good oil filled shocks!

Nice work! Insane how refined that design is and has become over the years. One thing that you probably already know: your tires are badly deforming at high speeds, and I think that's really hurting your stability. Might need to 3d print larger rims and then make solid or nearly solid tires out of TPU or something.

awesome work! consider aerodynamic stabilization; a bit of aero drag behind the cg will help. you need to keep it low to the ground so you don't induce a pitch up moment. downforce helps too. there's lots of well understood profiles, but I think it would be cool if you make a diffuser work well

** Edited *** Found parts list, Great video! Subscribed!

what a great piece of engineering!

I only recently got a 3d printer, it has a tiny build volume (100x100x100mm), but this makes me excited to try and make something like this. I've made various rc cars using Lego technic, so I think I have enough knowledge to now do it fully custom, heh

I've been upgrading rc cars recently and had built one that went way too fast and had the same issue. Super glue definitely works haha

As a past RC Oval National Champion, speed is all about the less friction you have the better. Your main gear I called it a Spur gear and your motor gear a pinion gear is too big and bulky. Try and modern brushless motor setup with a modern spur gear and pinion, you will be amazed at the results. Also for steering the less steering you have for just going straight would be better, a very slight toe out would make it more stable. The rear arms with 0 degree toe out would be for all out speed, or a very slight toe in for a bit more stability. Also get a modern radio setup with the trigger and steering wheel control, much easier. Now this is all pending on what kind of budget you have. :) I wish you much success.

Fastest 3 D printed RC … love it 👍👍👍good luck

that was the best thing I've seen on the internet! thanks

To fix the "de-beading" issue with the tires. You can use a popular drag racing and offroading design called a "bead locking wheels". Instead of glue, it's a clamp.

Great project, thanks for sharing

As your tyres rotate faster the contract patch goes from square to a tiny oval. Meaning you get far less contact area at high speeds. You could buy high speed tyres, 3D print some, glue foam into them to stop the middle expanding, or 3D print inserts you for into the true and run to stop them being able to deform at high speeds.

it would also be a good idea to look into belted tires. they don't blow up or expand. great video!

Thank you for this. Ill be buying a Bamboo soon and an RC car is going to be my first project.

Can you post your stl’s please

'Preciate the MJF entrance bgm

as an avid rc person i can give you two tips first is set ur camber in just a little so both tires pull towards the center this is really good for hig speeds but not so good for turning the second is solid tires you can purchase high speed solid rc tires the tires your using are for a offroad truck and they like to ballon out around thirty miles an hour this will pick your rc up and make it very unstable... likley to flip and the tires can explode

clicked immediately. going to try to recreate this over the summer.

It’s crazy your doing this. I’ve been also printing a few different designs with a speed goal. The biggest problem you will have is stability. I’m on my 4th variation and so far can’t hold straight above 45-50mph. Try drag tires on the rear and smaller up front. Hurts the turning but it goes straight. If speed js the goal you need to get the nose down so wind can flow over.

Lol this is quite insane, hitting these speeds on a printed car. Well done!

Great work, and amazing content.

1. Use a body cover 2.change/ optimize gearing 3.move center of gravity closer to the middle if the car if rear wheel drive, or 4. Make the car 4wd and move the center of gravity towards the middle.👌🏾

Audio guy here, Nitpick, at 1:57 you mention the velocity fluctuating with a sine wave. A Sine wave is a lot less jagged, very smooth and round. You showed something that looked like a slightly distorted triangle wave. Love the video tho, first one I see from you and I will check some of your others :D

Loved the video! Also got a few tips for you: Put a RC Body on it. That would help an insane amount, when it comes to aerodynamics. Buy different tires! These things are offroad tires and not even belted, meaning they expand at high RPM, which isn’t good for stability. Use a proper RC Car remote, not an RC plane one. That would make it way easier to control. Hope this advice helps.

your tires are causing most of the instability also when adjusting your toe make ur wheels slightly tilt towards each other it helps keep cars straight at high speeds also the straight cut gear will give you better torque.

When the tyre balloons the contact patch / grip will significantly reduce. I would look at getting ones with internal re-enforcement if you want to go faster :)

As someone who has a couple of old rc cars for which parts are nonexistent, you convinced me to try and look into 3d printers!

Sick! great work!!!

Most RC tires have foam inserts and typically require gluing to the wheels unless using bead locking wheels which are mostly for rock crawling rc cars and aren't meant for those high speeds like normal RC tires and wheels are. So the issue isn't the prints, it's just that even normal RC car tires do need to be glued on normally because they'd also just fly off the wheels too.

- You definitely need to switch to foam tires. - Is there any oil in the shocks? The car looks bouncy as hell. If there is, switch to a heavier weight. - Convert it to 4wd, there aren't a lot of 2wd speed run cars around. - angle your wing and splitter so they produce some actual downforce, but not too much. Might as well throw a body shell on, too.

I whould give the front wheels a toe-out and the back wheels a toe-in for greater stability its used in rc buggys. i whould also recommend a set of foam tires or some type of "belted tires" to help whit the expansion or "balloning" of the tires to help whit stability. You migth be able to change so that the wheels are belt driven instead of using gears that whould help lots with the sound and durability of the gearbox. I dont know what oil you have in your shocks but the car could get more stabile if you use thiner oil or thicker oil so that migth be worth looking in to. You migth benefit from using a rear defuser and some more downforce in both the back and the front. And as a last note after a certain point you are going to need belted or foam tires since normal tires will probably explode that i know from experiance but i drive a 1/8 scale buggy whit a motor capable of 55 000 rpm. Best of luck :)

What I noticed when you get to the higher speeds, the tyres elongate which is probably why it's becoming unstable at higher speeds. I would consider looking into a harder compound of tyre to try and mitigate that. I'm guess that the tires don't actually have any pressure in them, but I bet if you had a rim and tyre that can take pressure you would eliminate this problem. Now looking at the next video you totally did that lol. Anyways good stuff!

You need belted tires. When you go faster your tires get larger, if you unsettle the car with a bump and one of the rear tires lifts off the open diff will send all the power too that wheel making it even larger, giving it more effective tourqe when it touches back down. This causes you to spin out.

This is going to be great!

Have you seen the one I 3d printed. Nice video buddy.

This is fun. I kind of want to see TPU printed tires. This makes me want to build my own

Cool video. I use that same Lipo charger for FPV quad batteries. Thanks for the future project

A little bit of toe in should make it more stable on straight line but also it increases the rolling resistance, also fix the ballooning of your tires and put a shell on it.

print the motor gear at an angle(about 45*) to reduce the stress on one layer. it helps a lot.

You can also reinforce your 3D printed parts with steel wire and steel rods, or aluminium rods in Z direction for instance. You can also try and cast the gears out of ZAMAC or PU. Build in predetermined breaking points in your design to shield your most valuable components. Use a simple plastic sheet on top of the car for better aerodynamics and as a shield against those stones etc. Use flexible bumpers in the front.

Inspiring stuff! Can't wait to see the last leg of your journey when you blow past the goal :D

OK, some Ideas. So for RC cars, it actually pays to have AWD even for high speed builds. You just have more stability and control, if your front axle pulls, hence you can accelerate faster. This gives you a faster top speed before your sight range ends. Also, consider using hub motors (sub 1000KV), they give you a really low center of gravity. They car doesn't flip, it just slides in circles when losing control. And BL outrunners are tough, I couldn't even kill them in sand, snow, dirt, anything. Brawback is the increased unsprung weight, so you need a smooth track to drive on.

Great project! Thanks for sharing! Could not having a body cover be causing strange areas of drag, thereby causing instability? Lol seems like there’s lots of great suggestions.