3D Rocket Parts Designer

Create custom nose cones with ogive, Von Kármán, elliptical and conical profiles, threaded motor retainers, aerodynamic rail buttons, boat tails, tube transitions and fin slot cutting guides. All parts are fully parametric — adjust dimensions, wall thickness, shoulder fit and thread settings, then export as STL files ready for your 3D printer slicer. Supports both metric and imperial units.

What would you like to make?

◀

Nose Cone

Retainer

Rail Button

Boat Tail

Transition

Slot Cutter

▶

UNITS

mm inches

▲ Nose Cone

#9650; Nose Cone

Body tube -- Select tube --

Shape

Ogive

Conical

Elliptical

Parabolic

Von Karman

Power

Tangent OgiveConical EllipticalParabolic Von Karman (Haack)Power Series (0.5)

Outer diameter (mm)

Length (mm)

2:1 3:1 4:1 5:1 6:1

Wall thickness (mm)

Shoulder length (mm)

Shoulder OD (mm)

Shoulder base fillet (mm)

Tip radius (mm, 0=sharp)

Fit tolerance (mm) ⓘ

Fit tolerance reduces the shoulder OD for an easier fit inside the body tube. 0.2mm is typical for 3D printing.

⚙ Base / Mounting

Open

Plate

Bar

Open (no base) Solid plate Cross bar

Plate thickness (mm)

Centre hole dia (mm, 0=solid)

Bar width (mm)

Bar thickness (mm)

Boss OD (mm, 0=none)

Boss length (mm)

Boss chamfer (mm)

Boss extends upward inside the nose cone for deeper threaded eye-hook mounting. Centre hole passes through both base and boss.

⚡ Metal Tip (supersonic)

Enable separate metal tip

Cut distance from top (mm)

Plate thickness (mm)

Bolt hole dia (mm)

Tip hole dia (mm, 0=solid)

Tip hole depth (mm)

0 = auto (40% of tip height)

Tip is rendered as a separate solid piece for CNC machining from metal. The body gets a mounting plate at the cut point. Both pieces shown separated for clarity.

Alignment indent

Indent dia (mm, 0=auto 70%)

Tolerance (mm)

Indent depth (mm)

Protrusion height (mm)

🚀 Booster Mode

Side booster nose cone

Main body tube -- Select tube --

Main tube OD (mm)

Gap (mm)

Creates a conformal cutout where the nose cone meets the main body tube. The booster tube sits alongside the main tube, and the nose cone surface is trimmed to match the main tube curvature. Gap adds clearance between tubes.

Your slicer may report non-manifold edges on booster nose cones — this is normal and auto-repaired during slicing. The part will print correctly.

📥 Export

⬇ Export STL Units: mm

Tip: Set your slicer (Bambu Studio, PrusaSlicer, Cura) as the default app for .stl files — then Export STL opens it directly.

Mesh quality Low (24)Medium (48)High (80)Ultra (128)Max (200)

STL files can be imported directly into slicer software (Cura, PrusaSlicer, etc). All dimensions are in millimetres.

▶ Rail Button

#9654; Rail Button

Standard

Aerodynamic

Preset 6mm rail 8mm rail 1010 rail (1" / 25.4mm) 1515 rail (1.5" / 38.1mm) 2020 rail (2" / 50.8mm) Custom

Overall OD (mm)

Overall height (mm)

Neck diameter (mm)

Neck height (mm)

Bolt hole (mm, 0=none)

Countersink dia (mm, 0=none)

Chord length (mm)

Tail radius (mm)

Spool-shaped button: top and bottom flanges slide in the rail T-slot channel with the neck sitting in the slot opening. Bolt-on mounting through the centre.

📥 Export

⬇ Export STL Units: mm

▼ Boat Tail

#9660; Boat Tail

Conical

Ogive

Elliptical

Conical (straight) Ogive (curved) Elliptical

Body tube -- Select tube --

Upper OD (mm)

Lower OD (mm)

Taper length (mm)

Wall thickness (mm)

Shoulder length (mm)

Shoulder OD (mm)

Fit tolerance (mm) ⓘ

Boat tail reduces aft diameter to lower base drag. Shoulder is kept short (10-15mm) as fins and centering rings limit space inside the airframe.

📥 Export

⬇ Export STL Units: mm

⬍ Transition

#11021; Transition

⚠️

Transitions are structural components under significant flight loads. PLA and other brittle materials may not be suitable. Consider PETG, Nylon, ASA or other tough materials.

Conical

Ogive

Elliptical

Conical (straight) Ogive (curved) Elliptical

Upper tube -- Select tube --

Lower tube -- Select tube --

Upper OD (mm)

Lower OD (mm)

Taper length (mm)

Wall thickness (mm)

Upper shoulder (mm)

Upper shoulder OD (mm)

Lower shoulder (mm)

Lower shoulder OD (mm)

Fit tolerance (mm) ⓘ

Smooth

Glue Ribs

Number of ribs

Rib depth (mm)

Connects two different diameter body tubes. Shoulders slide inside each tube. Shoulder length should be at least 1x the tube diameter for strength.

📥 Export

⬇ Export STL Units: mm

⚙ Motor Retainer

#9881; Motor Retainer

Motor tube -- Select tube --

Smooth

Ridged

Hex

Smooth Ridged grip Hex flats

Motor tube OD (mm)

Motor tube ID (mm)

Wall thickness (mm)

Glue section (mm)

Thread section (mm)

Thread tolerance (mm)

Thread pitch (mm)

Thread depth (mm)

Retainer lip (mm)

Cap thickness (mm)

Glue slots on inner bore

Fit tolerance (mm) ⓘ

Two-piece retainer: base ring glues over the motor tube, threaded cap screws on to hold the motor. Fit tolerance enlarges the inner bore for easier fitting over the tube. Thread tolerance adds clearance between male and female threads.

📥 Export

⬇ Export Base Ring ⬇ Export Cap

⬇ Export Both (preview)

Export base ring and cap as separate STL files for printing. The combined export is for preview only.

🔧 Fin Slot Cut Guide

#128295; Fin Slot Cut Guide

Airframe tube -- Select tube --

Tube OD (mm)

Wall thickness (mm)

Fit tolerance (mm) ⓘ

🔨 Collet Clamp

Finger count

Collet length (mm)

Slot width (mm)

Taper (mm) ⓘ

Thread length (mm)

Thread pitch (mm)

Thread depth (mm)

Thread tolerance (mm)

The collet end has longitudinal slots creating flexible fingers. A threaded nut rides up on the tapered outer surface of the fingers, squeezing them inward to grip the airframe tube.

✂ Fin Slots

Fin count23456

Slot width (mm)

Slot length (mm)

Guide section length (mm)

The guide section sits over the airframe tube. Use the slots to guide a craft knife to cut precise fin slots in the tube. Slot length should match your fin root chord + a few mm for clearance.

🛡 Internal Support (optional)

Weak tube — internal support

Support tube ID (mm)

Wall thickness (mm)

Fit tolerance (mm) ⓘ

Length (mm)

Prints a separate internal support tube that slides inside your airframe tube before clamping. Stops the tube from being crushed or deformed by the collet — useful for very thin cardboard tubes and thin-walled fibreglass. Most good-quality cardboard tubes (Klima, LOC, Estes) don't need it. Position it under the clamping section while cutting slots.

📥 Export

⬇ Export Guide ⬇ Export Nut

⬇ Export Internal Support ⬇ Export All (preview)

Export guide body and clamping nut as separate STL files. Print in PETG or Nylon for best flexibility at the collet.

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🛈 About this part

Design custom nose cones with ogive, Von Kármán, elliptical, conical and haack profiles. Set wall thickness for hollow printing, add a shoulder to fit inside your body tube, and choose a base mount — solid plate, cross bar or threaded boss for eye-hook attachment. Optional features include a separate metal tip section for CNC machining and side booster conformal cutouts.

🛈 About this part

A two-piece threaded motor retainer that holds your motor in place during flight. The base ring glues over the motor tube with optional glue slots for a stronger bond, while the threaded cap screws on to retain the motor. Choose smooth, ridged or hex grip textures on the cap for easy hand tightening. Export the base ring and cap as separate STL files.

🛈 About this part

Rail buttons slide into aluminium launch rail channels and guide your rocket during the first moments of flight. Available in standard spool and aerodynamic airfoil profiles with presets for common rail sizes including 6mm, 8mm, 1010 and 1515 rails. Set bolt hole diameter and optional countersink for flush mounting.

🛈 About this part

A boat tail reduces your rocket's aft diameter to lower base drag and improve flight performance. Choose conical, ogive or elliptical taper profiles. The shoulder fits inside the body tube for a clean transition. Keep the shoulder short (10–15mm) since fins and centering rings limit the space available inside the airframe.

🛈 About this part

Transitions connect two different diameter body tubes with a smooth taper. Both upper and lower shoulders slide inside their respective tubes. Choose conical, ogive or elliptical profiles, and optionally add glue ribs to the shoulders for a stronger bond. Shoulder length should be at least 1× the tube diameter for structural strength.

🛈 About this part

This prints a tool that slides over your tube and clamps in place using the screw-on nut and tapered thread. The slots you specify can then be precisely cut with a craft knife in your tube and be reused as needed.

📊 Part Statistics