ST-180 Tractor 4x4 - 1/8 scale

 RC model of articulated  heavy tractor-truck with single/dual       wheel  setup and  functional  rear suspension  of  accessories

Dimensions:

• Length = 700 mm

• Width = 268 mm-Single setup, 330 mm-Dual setup

• Height = 380 mm

• Weight = cca 4 kg

Filaments consumption: 

• 3kg PLA + alternatively 0,1kg PC Blend for gears

• 0,7kg TPU 90A for tires,

• 0,1kg PETG

Print settings:

• standard value of infill is 15%, if a different value is needed, it is stated in the file name

• 2 perimeters

• concentric pattern of top layers for tires

• classic generator of thin walls, do not use arachne

• print speed for TPU/Flex max. 40mm/s

• All of printed parts are designed for printing without supports, necessary supports are always included in STL files.

• Use standard printing values according to the producer of filament.

                             You will need non-printed parts:

Hardware:

• Motor of size 3536-750kV(25x19mm-3/4holes)……………….....1pc

• Servo of standard size 40x20x38mm(25T)-25kg torque.......2pcs

• Servo arm 25T-20mm………………………………………………………..........2pcs

• Electronic speed controller ESC 30/60A .………………...…..........1pc

• Li-Pol/Li-Fe aku 2S  7,2V/6,6V  ............……………………..……..........1pc

• PET foil 0,8-1mm thickness of size A4…………..………….…............1pc

• 61700 2RS/ZZ bearing……………………………………………….......……….34pcs

• 623 2RS/ZZ bearing…………………………………………………….....…....….2pcs

• Timing belt HTD 144-3M-6mm …………………………………….............4pcs

Fasteners:

• Button Head M2,5x6 ISO 7380    4pcs

• Button Head M2x6    ISO 7380     83pcs

• Button Head M2x8    ISO 7380     3pcs

• Button Head M3x6    ISO 7380     37pcs

• Button Head M3x8    ISO 7380     82pcs

• Button Head M3x10   ISO 7380    47pcs

• Button Head M3x12   ISO 7380     68pcs

• Button Head M3x16   ISO 7380    41pcs

• Button Head M3x18   ISO 7380    4pcs

• Button Head M3x20  ISO 7380    2pcs

• Button Head M3x25  ISO 7380     2pcs

• Button Head M3x30  ISO 7380    2pcs

• Button Head M3x45  ISO 7380    16pcs

• Hexagon nut M3          ISO 4032    17pcs                       

                                                    Your choise

You can choose SINGLE or DUAL wheel setup. Both variants, single and dual wheel setup are included in print files.       

             

                       DUAL Wheel setup                                                   SINGLE Wheel setup

               

                                            Assembly Manual

The illustrated Assembly Manual will guide you through assembling the model. It contains all information necessary for successful assembly of this model.

Before you start the  assembly please read thoroughly  the entire manual!

Download link of Assembly Manual: 

Assembly Manual ST-180 Tractor PDF     

                                               Changelog

28.4.2026

Steering cylinder  has been improved to prevent steer jamming:

• Steering cylinder - new STL file

• Print plate 34-steering cylinders - new .3mf file

9.4.2026

Locked diff option added:

• Diff cage 2-locked diff - STL part for locked diff

• Print plate 7a-diff cages-infill 80% - print plate for locked diff

• Assembly manual page 31, 36 - assembly locked diff parts

The recommended solution is to choose the opened front and the locked rear differential.

     

                              What would your model look like...

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                                                 Notice

Remember that the PLA used to print the Belt DriveBox parts is not heat resistant, so only drive for short intervals. Otherwise, there is a risk of melting the gears.

If you want, you can print the Belt DriveBox parts from PETG to use in hot weather or rougher driving.

Always operate the model on open terrains, far from cars, traffic and other people.

Always keep the model in view and under control. 

Use only fully charged batteries.

Always keep the transmitter switched on when the model is switched on.

Always remove the battery before disassembling the model. 

Keep moving parts clean and dry at all times. 

Always remove the battery after use. 

Never operate the model with damaged wiring.

Never touch rotating parts.     

For more info: https://www.3direction.com/

                                  Terms and Conditions of Use

By downloading the files you agree with these Terms and Conditions of Use, you agree that 3Direction is not responsible for any harm or damage caused by  using printed  parts or whole model. By agreeing with these Terms and Conditions of Use  of 3Direction you agree to use this model at your own risk.

You may print or download the files from this site solely for your personal, non-commercial use only provided that you agree not to change or delete any copyright or proprietary notices from the files.

The files (STL, 3mf, PDF) may contain technical, typographical, or photographic errors.

The model is intended for fun driving and load corresponding to the possibilities of the listed printable materials, 3Direction bears no responsibility for any defect of the model caused by use, especially excessive use.

You can always print damaged parts again and again and again....:-)
 

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