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The arduino nano has been programmed to assist the steering by slowing down both left wheels (or right wheels) when making a turn to the left (or right). The arduino code has been added to this project (see RaceCar2.zip). The arduino code arms by turning steer first fully to the left and then fully to the right. The third channel is used to switch from Low Speed mode to High Speed mode.
Recommended material: ABS (50% infill) except for the tires Ninjaflex (10% infill)
To make the car more durable in case of a crash, I recommend to print following parts in Ninjatek Cheetah: nose (50%), WheelAxisHolderRight (70%), WheelAxisHolderLeft (70%), RainlightAndDiffuser (70%), RearWing (70%).
The top speed of the car, when using 930KV motors and a 2S battery, is about 80 km/h. All used electronics is rated for 4S max, which would lead to a ridiculous top speed of about 160 km/h. (2S is really sufficient).
Driving time with a 4200mAh battery I estimate to be at least half an hour. My half hour testdrive of the car with a fully charged battery (4.20V) only did make the battery drop voltage to 3.95 V.
Changes 18 April 2019
support of expo steering
6 drive modes which can be chosen via channel 3 (halfspeed 4 wheel drive, full speed 4 wheel drive, halfspeed front wheel drive, full speed front wheel drive, halfspeed rear wheel drive, full speed rear wheel drive
buzzer feedback to user about arming state/signal lost/driving mode
front spoiler which can hold extra weight (M8 thread, see detailed photo)
strengthened nose (printed in Ninjaflex 70% infill, but can also be printed in ABS)
new FrontWheelHub that allows motor wiring to enter the "front" part at the correct spot
front, containing hooks for the front motor wiring
stiffened pushpin (also added an enlarged one, to make the wheels point inwards slightly)
enlarged LockPin (to avoid unintended opening of the battery compartment)
added optional NoServoSaver part. This will remove the servo saver, but will stiffen the steering.
Changes 20 April 2019
removed drive modes for front wheel drive and rear wheel drive.
added battery voltage alarm
reduced servo expo slightly
moved holes in WheelAxisHolder to provide more strength
increased strength of pushpins
Changes 22 April 2019
added front spoiler "FrontSpoilerStrongNoseLong" with space for 6 M8 threaded rods with length 45 mm (extra weight to keep to car hopefully better under control at high speeds)
Changes 2 May 2019
migrated from Arduino IDE to Platform IO
added support for LED strip WS2812 to indicate several states (armed/disarmed, direction left/right, throttle forward/neutral/backward)
changed Front Spoilers to be able to contain more weight (12 x m8 threaded rods with length 45 mm)
Changes 2 May 2019
added small LED cable hole to motor cover
Changes 8 May 2019
added LEDStripMount to connect LED strip to RainlightAndDiffuser
added customized RainlightAndDiffuser with holes to hold the LEDStripMount
added WheelAxleProtector (ninjaflex) to put over M5 nuts of motors
Changes 10 May 2019
Changes 15 May 2019
fixed hole position in UpperBom
Changes 13 Jun 2019
added BLHeli_s esc settings (front motors without braking, back motors with braking)
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