Robak 2 - 3D Printed 4WD RC Car
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- Опубліковано 25 жов 2022
- Today we're doing a complete build for the Robak 2 3D printed 4WD RC Car. This is a full start to finish build video including installation of the chassis, front and rear diffs and suspensions, metal drivetrain and steering components, electronics, body, 3D printed TPU tires and more!
If you'd like to build one of these for yourself here's where you can find the files I used in this video:
- Robak 2 - www.printables.com/model/1197...
- Wheels - www.printables.com/pl/model/1...
- Tires - www.thingiverse.com/thing:537...
- Wing Nut - www.tinkercad.com/things/0HVy...
- HSP 02016 Temp Drive Cup - www.tinkercad.com/things/6S5r...
If you're looking for cool ideas for 3D printed RC projects like this one to build, kits, parts, or instructions on how to build them check out our website at www.rcprinter.com . We don't currently have kits available for the Robak 2 but I hope to add them soon so keep checking back. - Наука та технологія
Wow! I'm so happy Robak joins your impressive 3D printed vehicles collection. Can't wait to see the car running outside 🔥Watched the video 2 times so far trying to spot all the difficulties you've faced during the build😉That's priceless information for the future modifications and guides. You did it really well! Thanks 🤩
Thanks man! This was a great build and I hope to do a bunch more testing on it soon and then put together some full kits for people on our site (www.rcprinter.com). The motor I installed in the video is way too high of a KV and its not sensored but I stock a bunch of 13.5T brushless sensored rocket v3 motors that should work perfectly so I'll do that upgrade with some hardware upgrades in the next video once all the parts arrive :)
Looks pretty dope. Nicely done. I notice your videos are increasing in quality. Keep it up
Thanks man 😁
Looks strong, loved the printed tyres as they look so Lego 🙂
Yeah they're neat, I'll get em bashing around outside in the next Robak video I do and we'll see how they perform.
The larger rubber tires really make a world of difference in enjoyment of the Robak.. along with good shocks. I absolutely love my Robak2. I used a sensored 10BL120/Rocket V3 13.5T and I really think that going sensored has a lot of advantages in this larger vehicle at low RPMs. When I used a $50 surpass 540/60A esc it would cog constantly in grass because the unit is quite large and with the large rubber tires, it will have quite a bit of initial resistance to getting started. So the cheaper pair was useless in my Robak2, but worked really well in my Badger (and guessing it would in the Ultra)
Great to know the 13.5T works well that Rocket V3 is the exact same motor I'm putting in it next! I'm looking forward to seeing how well those big tires work outdoors on a better setup. I also hope to build a badger soon too. So much to do!
@@rcprinterWell not exactly first hand knowledge.. I somehow confused my order and ended up with the 10.5T and it does get a bit too hot if you run it flat out for 5 minutes or so. So you need to manage the heat.. But the 13.5 should be cooler as its top end is slightly less. I measured 32kph with the 10.5. I built some small dirt ramps and it jumps small stuff pretty well. Have had for about 3 weeks with no breaks! So I can't guarantee exactly how cool the 13.5 will be.. However, I see you used that combo in another project so figured you had them around.I wish they had a bit more robust sensor cable.. seems pretty flimsy to me .. and would be nice if they monitored temp of motor.. but that is available only on more expensive combos (I think). But I've decided sensored is the only way to go on anything 4wd and requires this much momentum to start. BTW I did build Badger and it was a fun build.. works well, but really needs rubber tires and real shocks.. The TPU tires look great and work well in grass & dirt, but its a racer and the grass & dirt need to be very flat and well groomed as clearance is low. Those are on order so haven't put it thru its paces yet. The $60 sensorless combo works great in that.
Hey so I upgraded to the 13.5T and its still getting a bit too hot although it runs really well. Not sure if I want to try a fan or a smaller pinion or a higher T motor or some combo. I also got those rubber tires and they're great so far, a big upgrade from the printed ones.
@@rcprinter I never mentioned it.. but my body is modded.. I used the 2 piece cover with the SCOOP. It brings some air in.. and I added (drilled) 9 holes on each side of the scoop..(I can sent pic if you want) to vent air. Ideally there should be some holes under the motor to allow air to run up over the motor, but water might get in.. I think this design has quite a bit more resistance to rolling than most other designs.. The tires are large and it is four-wheel drive.. Likely could benefit from a larger sized motor. I don't think a different T size makes a different.. just need larger than 540. You might try a smaller pinion to ease torque a bit. Mine doesn't overheat unless I run flat out a lot.. Generally I run about 5-10 min and then have a cool down cycle. But it works really, really well in semi-rough terrain. By far the best vehicle I've seen for a sort of Moto-Cross style running. And I really think a sensored setup is ideal for this large a vehicle.
@@davecrabbe4579 thanks for the advice Dave, I've ordered a smaller pinion so we'll see how that goes to start and I might try a slightly larger motor too.
Nice build :)
Glad you like it
Looks like it should be durable. May try printing one myself. Someone just needs to design a nice body for it to finish it off.
A nice truck body would be pretty cool. I wonder how close the Ursa bodies would be to fitting... Hmmm
Thank you, you jave made a good video! Keep up the good work. You deserve much more likes and views .
Thanks!
Замечательно! Все детали очень крепкие.
Thanks!
Awesome. You are my favorite channel! I will watch the video when i am home. Still waiting for a touring car tough ,😜
Up next :)
Yeah, do the Amin Landwehr Touring Car from Thingiverse 👍🏻
@@77LaKoS77 I've already printed the Veltro but I'm trying to find that one now... do you have a link?
@@77LaKoS77 Thanks I'll check it out. Doesn't have to be an original if its a great build.
I was thinking about building this but I saw you guys didn’t have a kit so I haven’t yet. I really hope you add it!
We will soon I hope. It'll take a month or two though because I still have more testing to do and then everything has to come from China.
Love it, another good one
Thanks! Hope to put it through its paces soon.
@@rcprinter it looks like it could take somewhat of a beating
@@Poulpc I hope so. Those are pretty big tires though.
@@rcprinter yep, and they look very hard, but i like the design, I might use something similar for my off road
wich one would you recomended ? this or the Tarmo 5 ?
great build! how would you compare this to the Tarmo4? Looking for a new RC to print while we wait for Tarmo5 release!
Seems pretty durable in my testing so far... should have another video up about it next week. I'm running a 13.5T motor and its getting a bit hot though with a 21T pinion. Those wheels are big!
The ar looks well designed and sturdy.Do you agree?
So far it seems pretty sturdy but I haven't put much power through it yet or run it outside. We shall see pretty soon.
@@rcprinter please give it a stress test if possible
Nice build. What is the spray that you used a couple times in the video?
It's an activator for the glue I was using. It's a Cyanoacrylate glue like super glue.
what brand is the screwdriver bit set you use on the drill?
those are mip speed tips. They're nice and they last, but you can find cheaper alternatives too
can you make a kit for this that has everything but the electronics? I need the driveshaft and stuff, but already have a motor, esc, and servo.
You can order the HSP parts kit on their own: rcprinter.com/products/hsp-parts-for-robak-2 and then also order a kit with fasteners and bearings here: rcprinter.com/products/robak-2-build-kits?variant=42891241062561
Which one is better the robak 2 or mkultra?
They're quite different. Both are good. I personally enjoy the mkultra more but that's a bit more just my style.
What's the reason of that coughing on the throttle? Because it's sensorless? I have this issue on my challenger with a brushed motor and no differentials. Tried to tune it away in the controller, but not a great result.
Yeah sensorless is the main reason it acts like that (cogging) but its made worse by a low power battery, high KV motor, and really large heavy wheels requiring lots of torque to get moving. These are all things I'll fix in the next video :) If I were to just use a 3s 50C+ battery it would go a lot better without any other changes but I want to wait for the right diffs to be installed before I start putting lots of power through it.
@@rcprinter those tires have less grip than bought (gum) tires. My printed rim just ripped off so I switched to the "real" tires and immediately snapped the diff. 2S + 3 part diff case (mod or version 2.1) solves the problem.
@ thanks for the heads up.
A decent quality sensorless combo in many cases is enough to overcome the startup hesistation problem. More advanced ESCs run quite complex switching algorithms for the motor to provide enough torque even from 0rpm. I cheaped out on the ESC in the first gen Robak ($20 blue ESC) and it took me months to understand it's garbage. Then I had $35 RacerStar - tolerable but inefficent (motor was getting very hot). Finally upgraded to the HobbyWing EzRun MAX10 60A ($60) and it breathed new life into Robak. Specs on paper is the same for each one but in the field it's like night and day.
@@rcprinter what's the motor KV you're running? For me 3300KV works best. I can use 2S or 3S lipo, switch between 17T and 21T pinion gear while still being in the resonable power output range. You can take a look at the Robak power system table docs.google.com/spreadsheets/d/1-AEfSLWzXtjigXyWWhs8wwlRnVofR2l7TgEqp8cfjc4/edit?usp=sharing
Broo can u send me file..... 😢
www.printables.com/model/119715-robak-2-rc-car