📢 UPDATE NOTICE (Nov 1, 2026)

Several files including 3D model ZIPs, the assembly manual, and the BOM have been updated!
If you have already downloaded the files prior to this date, please re-download the latest versions below to ensure proper fitment and accurate assembly instructions:

• Updated Files:
  • 📄 RS04R_MANUAL.pdf (Added tapping guide, enhanced drivetrain assembly steps)
  • 📄 BOM.pdf (Corrected shaft lengths, updated notes & parts counts)
  • 📦 04_body_joint.zip
  • 📦 05_bumper.zip
  • 📦 06_chassis.zip
  • 📦 08_gearbox.zip

🏎️ Overview

A fully 3D-printable 1/10 scale M-chassis RWD RC car featuring an iconic Baja Bug body style. Built on the custom-engineered RS04R chassis (225mm wheelbase), this model combines aggressive off-road aesthetics with modular, hobby-grade engineering.

It features a clever modular body system: using a shared central body tub, you can easily swap the front nose and fenders to switch between a race-inspired Wide Body Type and a classic off-road Bugeye Type!

⚠️ IMPORTANT NOTICE

Please download and read RS04R_MANUAL.pdf and BOM.pdf first! They contains step-by-step assembly instructions with 3D CAD illustrations, as well as
the detailed parts list.

🛠️ Key Features

• Modular Body Conversion (2 Styles in 1):
  • Wide Body Type: Aggressive, widened stance for modern desert/rally vibes.
  • Bugeye Type: Classic vintage Baja Bug look with exposed headlights.
  • Both styles share the same main body shell—simply swap the front nose and fenders to transform your ride!
• M-Chassis Compatibility: Standard 225mm wheelbase (Medium M-chassis size).
• Modular RS04R Chassis: Highly serviceable front and rear modules with double-wishbone suspension and front rocker arms.
• Standard RC Electronics Friendly: Compatible with 380-size motors, low-profile servos, standard ESC, receiver, and standard battery packs.
• Detailed Documentation: Complete step-by-step visual assembly manual and comprehensive BOM included.

📐 Specifications

• Scale: 1/10 M-Chassis class
• Wheelbase: 225mm (M-Chassis Medium)
• Drive: Rear-Wheel Drive (RWD) with differential gear
• Body Styles: Convertible between Wide Body and Bugeye via swappable front nose and fenders
• Motor: 380 Size Motor
• Damper:
  • Front: ~62mm (e.g. Tamiya C.V.A. Mini / Low Friction Damper)
  • Rear: ~55mm (e.g. Tamiya C.V.A. Short)
• Tire / Wheel Size: M-chassis 60D Rally Block Tires (Outer: 60–80mm, Inner: 43mm)
• Servo: Low-profile standard servo recommended

🔩 Required Hardware & Electronics (Summary)

Detailed part counts and lengths are listed in the attached BOM.pdf.

• Bearings:
  • 520 (2x5x2.5mm) x24
  • 730 (3x7x3mm) x4
  • 1280 (8x12x3.5mm) x10
• Screws & Nuts: Metric JIS screws (M2, M2.6, M3 socket head cap & countersunk screws, M2/M3 lock nuts)
• Shafts & Pipes: 2mm steel/SUS304 shafts, 3mm pipe
• Electronics: 380 motor, ESC, receiver, low-profile servo, 2S LiPo / battery pack
• Linkage: Turnbuckles and 4–5mm ball ends/rod ends

🖨️ Recommended Print Settings

• Filament Recommendations:
  • Chassis, Arms & Brackets: PETG, ABS, or ABS-GF / PLA+ (tough filaments recommended for outdoor running)
  • Body Panels: PLA, PETG, or ABS
  • Gears: PETG, ABS, Nylon (PA), or POM for smooth meshing and wear resistance
• Infill: 30% - 80% (Gyroid or Grid recommended for chassis parts)
• Supports: Minimal / needed only on specific overhangs (refer to part orientations)

📖 Assembly & Support

• Step-by-step assembly manual with pictures is provided in RS04R_MANUAL.pdf.
• If you have any questions, feedback, or need build assistance, feel free to contact me via X (Twitter): @gm2bv.

🎨 License & Credit

This model and the manual are licensed under CC BY-NC-SA 4.0 (Attribution-NonCommercial-ShareAlike).

• You are free to share, remix, and modify this project for non-commercial purposes.
• Please attribute original design to gm2bv.
• Designed by : gm2bv
• Contact & Feedback (X/Twitter) : @gm2bv
  • If you build this, please tag or mention me on X! I'd love to see your builds!