3D printed 1:28 rc car
Sourcing
Most of the components for this build are very common components. I had most of the electronics already on hand from combat robot builds. Many of the parts are not available individually and may need to be purchased in larger packs in order keep the price down, no worries though, I am sure they will be useful for other projects in the future (or build multiples of these).
Stainless Steel Rods
Component | Source | Cost |
1mm stainless steel rod | $5.99 | |
2mm stainless steel rod | $6.99 | |
3mm stainless steel rod | $8.49 |
ESC Options
130 Motor Options
Component | RPM | Source | Cost |
OOD Valkyrie | 35,000 @ 11.1v | $3.00 | |
OOD Rhino | 36,000 @ 11.1v | $5.00 | |
OOD Meishel 2.0 | 33,000 @ 7.4v | $3.00 | |
OOD Kraken | 35000 @ 12v | $8.00 | |
Generic 130 Motor | 25000 @ 12v | $12.99 (for 10 motors) |
SG90 Servo
Component | Source | Cost |
SG90 Servo | $10.99 (for 5 servos) |
Battery Options
Hardware
Component | Quantity Needed | Source | Cost |
683ZZ | 8 | $9.49 | |
M2 x 16 SHCS | 4 | $12.76 (for 100) | |
M2 x 14 SHCS | 6 | $11.94 (for 100) | |
M2 x 8 SHCS | 9 | $10.88 (for 100) | |
M2.5 x 6 SHCS | 1 | $12.32 (for 100) | |
M1.6 x 4 Self Tapping | 4 | $12.99 (This is a kit of small screws) | |
M3 Set Screw | 1 | $0.11 |
Misc
Fabrication
TPU 3D Prints
ABS Chassis Parts
ABS Body Print
After reviewing how the parts from the previous print I noticed that a few could be orientated for a better finish as well. A few quick adjustments later and here is the new layout.
Assembly
Rear Differential
Assembling the Chassis Components
Modding
Silicone Tube Wheel - Planned Mod
The same silicone tubing I use for combat robot wheels should also work as a replacement tread for these cars. Taking a quick look through the McMaster-Carr listings and after measuring the current tires, this tubing should do the trick. The 35A tubing should make for a very grippy wheel. My intention would be to place these on the front wheels with the stock TPU wheels on the back to make the cars drift more readily. Utilizing these tires in the front and the back should create an car that has higher acceleration and handling due to the extra grip. This may prove to be to much grip though and could actually hurt the overall performance. This 50A tubing may be better for the rear wheels to allow for a some slippage to keep the handling smooth and predictable.
Replacement Bodies
I plan on making a few of these so I will naturally need a few more body kits. I think a Nissan GTR and maybe a Mitsubishi Evo are in order.
Tail and Headlights
Driving around in a dark room can be a pain without headlights. There are two additional channels on the receiver that could be utilized for tail and headlights to have individual control. The head lights can be linked to a toggle switch on the controller, allowing on and off control. The tail lights can be linked to an additional toggle, allowing for on and off control, but… here is where it gets cool. The taillights could be set to lower PWM value by default, something around 10-20% of full. When the throttle input is at zero or reversed the lights could be sent a higher PWM value to increase their brightness, effectively making brake lights.