Thingverse 3DRC 2wd Buggy User manual

3DRC 2wd Buggy
Assembly Guide
Fin Hudson
Filament generously
provided by

Part Preperation
Key:
M3 - Drill hole to 2.5mm, then tap with an M3 tap
3mm - Drill hole to 3mm
2mm - Drill hole to 2mm
If a part is not listed here it requires no preparation
Quantities listed in red
Diff spider gear x3 Diff ring gear x1
2mm
3mm
Diff side gear x2
3mm
Diff box main x1 All holes M3 Rear suspension carrier x1
3mm
M3
M3
3mm
Diff box cover x1
3mm
M3 Diff box top cover x1

Part Preperation 2
Key:
M3 - Drill hole to 2.5mm, then tap with an M3 tap
3mm - Drill hole to 3mm
2mm - Drill hole to 2mm
If a part is not listed here it requires no preparation
Quantities listed in red
Motor guard x1 Countersink
on underside
Suspension carrier x3 3mm
3mm
M3
Rear arm lower LR x2
3mm
Rear arm upper LR x2
Rear hub (L x1& R x1)
3mm
M3
M3
Rear axle x2
3mm
M3
Rear shock tower x1
Dogbone LR x1
(metal inserts)
2mm
Front arm upper LR x2
Front main x1
All holes M3
Front shock
tower x1
M3 3mm
M3
Front arm lower LR x1

Part Preperation 3
Key:
M3 - Drill hole to 2.5mm, then tap with an M3 tap
3mm - Drill hole to 3mm
2mm - Drill hole to 2mm
If a part is not listed here it requires no preparation
Quantities listed in red
3mm
M3
Front hub L x1& R x1
Front knuckle L x1& R x1
All holes M3
Steering linkage L x1
M3
Steering linkage R x1
M3
3mm
3mm
Centre link x1
M3
3mm Steering support x1
All holes M3
Steering link x2
All holes 3mm
Servo mount x1
All holes M3

8mm x 2mm shaft
22mm x 3mm shaft
RC car differential
shims (highly
recommended but
optional)
10x15x4mm bearing
x2

M3x12mm
10x15x4mm Bearing x2
M3x8mm

20mm x 3mm shaft
37mm x 3mm shaft
3x10x4mm bearing x4

M3x20mm
M3 x 8mm
M2.5 x 6mm

M3x30mm
40mm x 3mm shaft
M3x8mm
M3x8mm countersunk

M3 x 12mm
10x15x4mm bearing
x4

OR
M3 x 20mm
MUST be inserted
from the tapped side
of the arm.
M3 x 8mm
10mm lengths of
2mm rod
Optimal print orientations

40mm x 3mm shaft
M3 x 12mm
M3 x 8mm
M3 x 12mm

M3 x 20mm
M3 x 20mm
M3 x 8mm
Repeat for L and R arms
and knuckles.
M3x8mm countersunk

M3 x 8mm
M3 x 16mm
Countersunk
M3 x 8mm
Countersunk
M3 x 16mm
Countersunk
Do not over-tighten bolts

13g Servo
M3 x 12mm
M3 x 8mm
countersunk

M3 x 8mm
M3 x 20mm
Screw one wheel into each front knuckle, use
threadlocker as necessary to ensure they don't come
loose.
Use M3x20mm bolts to secure the rear wheels.

M3 x 8mm
M3 x 8mm Countersunk

Final notes
•A HIGH END PRINTER IS NOT REQUIRED, I printed all parts on a £200 TEVO Tarantula with
a 0.4mm nozzle and 0.2mm layer height.
•If parts are difficult to print, or break easily, try different print orientations. The front end
is tilted back by 15°, and so are many of the stl files. If a part is not lying flat when sliced,
try a rotation of 15°.
•The all plastic dogbones don't work very well in PLA, the friction causes them to soften
and break quickly. The metal-pin ones work fine in PLA.
•The pinion gear and transmission drive gears also don't work well in PLA with a brushless
motor, I had good results with PETG for these. However, PLA works fine for non-brushless
use. The actual differential gears work fine in PLA in my tests, and they should be greased
to reduce friction. Vaseline (petroleum jelly) works well.
•The spur gear and transmission drive gear must be a VERY TIGHT fit on the shaft (I needed
to press the shaft in with a vice). If there is any slipping, it will generate heat and soften
the parts. I had this problem with some old gears and it heated up enough to melt the
gear from the inside.
•Don't buy bad quality bearings like I initially did, the small amount of play in them caused
the gears to wear excessively.
•If the motor gets too hot with the 10-tooth pinion, switch to the 8-tooth pinion.
•I recommend using standard 1/16 scale oil filled RC car shocks at the front and rear for
optimal handling.
•Print the tyres with low infill (~8%) and few outer shells to make them softer for more
traction.
•If the 3D printed rear tyres don't give enough traction, standard 1/16 buggy wheels fit the
rear hubs.
•Use blue threadlocker on any screws that are used as pivots to stop them working loose.