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Old 09-08-2020, 12:48 PM   #1
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Default SCX 24 - Layer by Layer

It's been a while since I've made a proper build thread. I picked up an Axial SCX 24 this past weekend and it's shaping up to be the perfect test bed for a pretty extreme build.

After seeing the relatively small aftermarket offering for these rigs, I decided to splurge on a 3D printer (Creality Ender 3 V2). I plan to flex the capabilities of FDM printing as I work through various build iterations. I have no idea where this will ultimately lead, but I love building and having the ability to make parts on the fly is going to be awesome. Being able to test and tune in my living room is pretty solid too, haha.

Anyways, on to the build!


Next to my 2.2 Creeper





This thing is tiny





And the machine that will be doing all of the labor


Last edited by Bray D; 09-08-2020 at 04:33 PM. Reason: Pic fix
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Old 09-08-2020, 12:49 PM   #2
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Default Re: SCX 24 - Layer by Layer

I started by playing with the printer and getting the slicer settings dialed in pretty good. I made a filament guide, tolerance test block, Benchy, etc. The machine met all of my expectations. I think it'll be pretty solid.

Then I moved on to actual parts. I'm more-so a fan of performance rather than scale accuracy, so the first thing to address was the tires. I opt'd for the RC4WD Scramblers for their size and rubber compound. Looks like they'll conform pretty well under the light rig. Unfortunately the stock tires are glued to the wheels, so I needed to print some new wheels for the Scramblers.

15mm wide. 0mm offset. Two piece double beadlock. I just modeled it based on my size requirements, then added some features until I liked the way they looked. I plan to machine some brass for the internal locking sleeve to add some weight while I'm at it.









Fits the wheel pretty well. I need to print 3 more then I can mount them up for good.

I also printed a straight cage bar to replace the baja style lights up top.





Aaaaand a couple pics showing the test fit for the Scramblers. Part of me wants to print the wheels with more offset to make it wider, but I think I'll roll with it at the current width for now to see how I like it. 0 offset will make the steering happy, and with the wider wheel it'll be slightly wider than stock anyways.







That's where I'm at right now. Finishing the wheels is on the immediate list, and I'd like to start experimenting with printing full cages to see how that goes. This massive cage has to go!

Last edited by Bray D; 09-08-2020 at 04:36 PM. Reason: Pic fix
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Old 09-08-2020, 03:22 PM   #3
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Default Re: SCX 24 - Layer by Layer

Sounds interesting, but none of your pictures seem to be working

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Old 09-08-2020, 03:35 PM   #4
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Sounds interesting, but none of your pictures seem to be working
Uh oh. I pulled them from my Google Photo location. It's likely a private album so no one can see it.

I'll fix that pronto.

Edit: So many hosting issues today. I think that should work. Let me know if they're still broken.

Last edited by Bray D; 09-08-2020 at 04:36 PM.
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Old 09-08-2020, 07:26 PM   #5
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Default Re: SCX 24 - Layer by Layer

They work now!

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Old 09-08-2020, 08:08 PM   #6
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Default Re: SCX 24 - Layer by Layer

Looks good!


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Old 09-08-2020, 08:45 PM   #7
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Good deal. Quick update to put us back on track -

I machined the lock sleeves tonight and learned a thing or two about wheel / tire design. Turns out my lock sleeves are too narrow, but rather than machining replacements I've decided to print narrower wheels. I have a 13mm version printing beside me as I type. Sticking with 0mm offset. We'll see how they look when they're done.

I had some leaded bronze stock on hand, so that's going in the front. I made some thinner steel sleeves for the rear. I have no idea if this is too much weight, but I may as well try it and see how it does. I'm used to my 1:10 rig that literally weighs 10 times this thing, haha.





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Old 09-09-2020, 07:06 AM   #8
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Default Re: SCX 24 - Layer by Layer

The 13mm test wheel turned out great. I increased the flange diameter a bit compared to the previous one, and it obviously only has 13mm flange to flange opposed to 15mm. It squeezes the tire a bit more when assembled, but I'm cool with skinnies.

13mm vs 15mm




13mm assembly







With a successful prototype, I went ahead and printed a full set (with slightly more hex engagement).

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Old 09-09-2020, 05:43 PM   #9
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Default SCX 24 - Layer by Layer

They all assembled well and look great. They added significant weight too, though it doesnít feel too extreme.



Iím digginí the width with 0 offset. No immediate desire to change anything with the wheels.



I will, however, have to do some body chopping or push the axle forward as I have some interference with the tires. I have essentially a 90 degree approach right now without the bumper, so thereís not really a functional need to push the front end out. I feel like the wheelbase is pretty long as-is too.

Iíll probably have to get out the sawzall.



The steering servo and motor are pretty weak with the bigger tires and added weight. That needs remedied ASAP.

Iím familiar with the EMAX servos. What motors are people swapping into these little guys?

Last edited by Bray D; 09-09-2020 at 05:50 PM.
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Old 09-09-2020, 06:45 PM   #10
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Default Re: SCX 24 - Layer by Layer

I like where this is going. 3D printer + Lathe seems like a very powerful combo.

Good choice not going for a wider offset, steering is terrible enough as it is.
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Old 09-09-2020, 08:36 PM   #11
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Default Re: SCX 24 - Layer by Layer

Ecx barrage motor works well. You could drop in a sidewinder micro and run a small brushless. Just beware things will break. Throttle control is a must. I tried it, it was fun, but after breaking a few driveshafts and a axle I switched back to the barrage motor. As far as the steering replace the rear axle with a front one and go with 4ws.



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Old 09-09-2020, 10:24 PM   #12
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Originally Posted by HumboldtEF View Post
I like where this is going. 3D printer + Lathe seems like a very powerful combo.

Good choice not going for a wider offset, steering is terrible enough as it is.

Iím a tool junkie. I typically jump at the chance to increase my shop capabilities, as seen by the 3D printer purchase for this build, haha. I also have a small mill that comes in handy pretty often.

The stock steering is certainly lacking. Iíll do my research and put an adequate servo on it. Either way, I really like the stance right now.
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Old 09-09-2020, 10:37 PM   #13
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Ecx barrage motor works well. You could drop in a sidewinder micro and run a small brushless. Just beware things will break. Throttle control is a must. I tried it, it was fun, but after breaking a few driveshafts and a axle I switched back to the barrage motor. As far as the steering replace the rear axle with a front one and go with 4ws.

Nice. Iíll look into the barrage motor. I have no real desire to go brushless, but I do plan to eventually run a separate receiver and ESC so I can use my nicer transmitter (for what thatís worth).

Iím very much a low speed technical driver, so hopefully I can keep the mechanicals alive. It needs to be able to pull itself through obstacles though, haha.

The only wheel speed requirement for my 1:10 is that itís fast enough to throttle out of a roll. A similar requirement would be nice for this one, but it wouldnít be a deal breaker if I have to slow it down further to get the torque and modulation I want.

The 4ws setup looks legit. My 1:10 is setup with 4ws and Iím not sure if Iíll go that direction with this build or not. Iíll keep building and driving and weíll see where the journey leads!

While Iím still playing with the tires, I figured Iíd vent them and cut the foams.

I had no plans when it came to the foam, but I hacked them up pretty good. Itís hard to tell, but I cut 8 radial sipes in them and 1 circumferential sipe around the OD. All of those cuts run to a depth thatís approximately 1/2 of the foam thickness.



Itís still not as soft as Iíd like, but itís starting to squat a little when fully flexed.

Driver front at full compression causing the passenger rear to squat:




At rest:

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Old 09-10-2020, 03:45 AM   #14
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Default SCX 24 - Layer by Layer

I tried brushless just to see if I could do it. While it was fun, it was just to much.

I did keep the sidewinder micro (programmed to run brushed motors) mounted it under the battery tray. Fits perfectly. Mounted my receiver in the stock location.


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Old 09-10-2020, 11:43 AM   #15
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Originally Posted by PFongemie View Post
I tried brushless just to see if I could do it. While it was fun, it was just to much.

I did keep the sidewinder micro (programmed to run brushed motors) mounted it under the battery tray. Fits perfectly. Mounted my receiver in the stock location.
Good to know. Research shows that the Barrage motor is a pretty popular swap and motors are super cheap. I may end up going that route.

I just ordered a receiver so I can use my GT5 transmitter. I need to decide on an ESC and get that on order as well. Once I have that swapped over, I can see how it influences performance and go from there.

Edit: Sidewinder Micro 2 and Barrage motor are on their way. I'll likely toss the motor in it before I do the ESC swap as it'll get here sooner and it'll be good for science.

Last edited by Bray D; 09-10-2020 at 05:04 PM.
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Old 09-10-2020, 09:55 PM   #16
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Default SCX 24 - Layer by Layer

On tonightís edition of Ď3D printing FTWí youíll find Brayís whiskey fueled implementation of a steering solution.

I modeled this solely on intuition and printed it fully expecting to have to make another after I learned something about the spherical bolt fit. I was pleasantly surprised when everything snapped together beautifully.

20% infill PLA. I was worried about itís strength, but after seeing how much force was required to set the TREís, I have much more confidence. If it fails, Iíll print with 100% infill. If that breaks Iíll experiment with PETG.

Maximized drag link length and threaded it vertically into the tie rod. Plenty of clearance for the diff and no more floppy steering.




Old





New




Last edited by Bray D; 09-11-2020 at 07:31 AM.
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Old 09-11-2020, 08:37 AM   #17
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Default Re: SCX 24 - Layer by Layer

Looks good will be interesting to see how well it holds up. If you want to strengthen it more you can anneal it. This is how I do it Annealing PLA - Gramps Ramblings
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Old 09-11-2020, 10:07 AM   #18
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Nice. I didn't know annealing plastic was possible! I learned something today.
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Old 09-11-2020, 11:09 AM   #19
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Default Re: SCX 24 - Layer by Layer

Just keep in mind the dimensions will change and some parts will warp a fair bit. CNC kitchen on Youtube has some good video's on Annealing.

https://www.youtube.com/watch?v=dOzVuoBP9gY
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Old 09-11-2020, 11:44 AM   #20
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Thats pretty cool... would you mind sharing the STLs for the linkage?
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