3D Printable RC Cabin Cruiser Hull — Modular Scale Boat

An original 100% custom-designed RC Cabin Cruiser hull optimized specifically for FDM 3D printing and easy RC hardware integration.

This model features a modular architecture that breaks down into individual components, eliminating the need for complex support structures and allowing easy multi-color printing and component replacement.

Key Engineering & Design Features
100% Custom CAD Design: Designed entirely from scratch to achieve authentic hull geometry without relying on third-party blueprints or stock models.

Low Center of Gravity (CoG): Engineered with a continuous, open lower keel channel to place heavy ballast (lead shot or sand mixed with epoxy) at the lowest point of the hull for maximum stability on water.

Drivetrain & Hardware Mounts: Features a dedicated compartment under the wheelhouse floor tailored for 5°–8° angled prop shafts, standard RC motors, and couplers.

Modular Architecture: The hull is split into clean, logical components to minimize support usage and simplify assembly.

Durable Assembly Features: Integrated structural alignment ledges, interlocking joints, and reinforced screw bosses for long-term structural integrity.

Assembly & Fitting Tip
Due to differences in 3D printer calibration, thermal plastic shrinkage, or first-layer expansion ("elephant foot"), some interlocking joints, alignment ledges, or pin holes may fit tightly. If two printed parts are too tight to slide together smoothly, simply sand the mating surfaces with fine-grit sandpaper (240–400 grit) for a perfect, seamless fit.

File Structure (Included STLs)
Hull & Interior:

01_hull_main_shell.stl — Outer Hull Shell

02_hull_forward_bulkhead.stl — Forward Bulkhead (with cable/ballast pass-through)

03_floor_bedroom.stl — Bedroom Floor

04_floor_wheelhouse.stl — Wheelhouse Floor

05_bulkhead_bedroom_wall.stl — Bedroom Bulkhead Wall

06_door_bedroom.stl — Bedroom Access Door

Superstructure & Roof:

07_superstructure_outer_walls.stl — Wheelhouse & Bedroom Outer Walls

08_wheelhouse_rear_wall.stl — Rear Wheelhouse Wall & Main Door

09_wheelhouse_roof.stl — Wheelhouse Roof

Maintenance & Access Hatches:

10_hatch_deck.stl — Aft Deck Maintenance Hatch

Recommended Print Settings
Layer Height: 0.2 mm

Walls/Perimeters: 3 – 4 walls (essential for watertightness and structural strength)

Top/Bottom Layers: 4 – 5 layers

Infill: 15% – 20% (Gyroid or Grid recommended)

Supports: Minimal / Optional (depending on printer tolerance and orientation)

Material: PETG or ASA/ABS recommended for outdoor/water use (PLA can be used for display/testing)

Hardware Notes
Designed to fit standard RC boat driveshaft sleeves, prop shafts, couplings, and rudders widely available on online marketplaces (AliExpress, Amazon, eBay).

Need Custom CAD Engineering or DfAM Projects?

Feel free to reach out to me directly on Upwork for custom mechanical engineering, CAD modeling, and 3D printing design projects!