Some renders show this model in another colourway.

4WD speed truggy

My 1/10-class four-wheel-drive truggy for 4S, built to run flat out and take the hits.

Wheelbase: 300 mm
Track: 267 mm
Print time: 34.6 h on 10 plates
Filament: 1100.9 g

Colourway

PETG HF black main
PETG HF orange second
PETG HF white accent

About the design

I built this truggy for top speed on a 4S pack. A 3660 brushless motor drives metal diffs front and rear through a steel pinion and spur, and on paper the gearing passes 100 km/h. The chassis is a tub with a central rib and two side rails, and a spine across the top closes it into a box. A bow-shaped bumper takes the first hit ahead of the tyres. The lower arms are deep ribbed channels, which I sized for a hard landing on one wheel. The motor plate slides to set the gear mesh, and a guard keeps stones out of the gears. A servo saver and thick tie rods protect the steering. The body has a wedge nose, a bubble canopy and side scoops, and the rear wing presses the tail down at speed. Every part I print is PETG, and the wheels and tyres come ready glued.

What you can change

The gearbox housing's size, which places the cradles and caps
Motor, pinion and spur, with the mesh set on the motor plate
Pack, ESC, receiver and servo
Suspension pivots, caster and rear toe-in
Wheel and tyre size and offset
Ground clearance and the chassis's walls
The body's shell and the room round the wheels

Specifications

Wheelbase: 300 mm
Track: 267 mm
Length x width x height: 516 x 333 x 194 mm
Ground clearance under the chassis: 32 mm
Weight ready to run (g), my estimate: 3380
Weight on the rear wheels (%), my estimate: 52
Gearing: 64/21 spur and pinion times 38/13 diffs, 8.91 to 1
Top speed with no load on 4S (km/h), my estimate: 116
Lower arm's peak stress in a hard landing (MPa), my estimate: 18, against 32 allowed
Steering lock: 25 deg

Printing

Plates, print hours and filament grams for each print project
Project	Plates	Hours	Grams
4WD speed truggy, PETG HF	10	34.6	1100.9
Total	10	34.6	1100.9

Times and weights come from slicing the model at 0.20 mm layers. Each figure is rounded on its own.

In the room

Some renders show this model in another colourway.

Credits and licence

The layout follows "100km/h 3d Printed RC Car" by Hydrance (https://makerworld.com/en/models/2832201), shared under the MakerWorld Exclusive License. It is a 4WD truggy on bought metal diff gearboxes joined by a 170 mm centre shaft, with dogbones, 100 mm shocks and 130 mm monster truck wheels on 4S. Its users' lessons shaped my lower arms, gear mesh, bumper and steering. The design is my own and uses none of its files or geometry.