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3-D Printable RC Car

by cmpercle97, published

3-D Printable RC Car by cmpercle97 Aug 4, 2015
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This RC Car was Designed to workaround the need for expensive rc car motors and intricate linkages. When I saw the Open RC truggy, I wanted one, but didn't want to also buy all of the Rc car part needed just to get it working. I used parts that any typical maker may hopefully have. The 9 gram steering servos are mounted to the top a-arms to take away the need for ball joints and a large amount of linkages. For the motor...motors, I recycled my DJI Phantom brushless motors. instead of using any gearing, I simplified the design by making them part of the rear wheels. This creates a great amount of speed while still having a surprising mount of torque. I used a hobby grade rc plane radio and power the car using two 3s lipo batteries. The fasteners vary from m3 nuts and bolts to plastic screws I was able to salvage. The front wheels rotate around a general skateboard bearing. I want to see what others are able to do with this platform. Hopefully improvements will come forth, making the vehicle a reliable open source machine.




There are included color coded assembly files that hopefully help make assembly less problematic. Autodesk inventor was my CAD platform of choice. The STL files, for whatever reason, need to be enlarged by a factor of 10 in the object placement portion of your 3d printer software. I use a Prusa i3 from Folger technologies with a bunch of mods including a custom extruder and other parts. Repetier was the software I use to communicate with the printer. Slic3r is what I used to slice the objects. I would much rather a different plastic to print with other than PLA, but its the only plastic I can seem to get to stock to the bed.

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What's the scale of the car

It is around 1/10 in size

I like the direct drive motors. That is basically what modern electric cars do. I would love to see 4WD edition ;). Then you could do SW driven differential with SW locking (same torque on both front wheels). There would also be a lot other possible SW improvements.

I would definitely want to design a 4wd variant. And a large problem is at higher speeds the wheels spin at different rates, thus breaking traction. I don't know what would solve that issue, though 4wd might already be a fix for that as rear wheel drive is pretty unstable.

you can run multiple motors on a single ESC. you'd need a very high amp ESC so your goal of using cheap drone stuff kinda falls apart lol. I'm not sure how many motors you could run but i've seen 2 motors on one ESC all the time.

Looks like you could do with reducing unsprung weight a little. A free mod to start would be to mount your shocks the other way around.

If there are any questions regarding how something goes together, feel free to message me and I will try my best to help.

I uploaded the stp file of the assembly for you. Hopefully it works!

Great...! Thanks...!
I was able to open the STP file(sometimes it refuses)
But not all components are present I think.
Anyway, looks cool.


Can you post a STP file of the assembled cart please.
I use Inventor to but that's an old one (2008). I can't open new ipt/iam files.