Threaded Bottle & Cap Generator
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Threaded Bottle & Cap Generator
This generator lets you create a completely custom threaded bottle and matching screw-on cap without having to manually model either part. Adjust the bottle size, wall thickness, shoulder, neck, thread profile, cap grip, sealing style, and more. The bottle and cap are generated together so the threads stay matched, and the bottle includes a solid collar that gives the cap a proper mechanical stopping point instead of letting it screw down until the threads become loose.
The default settings create a compact general-purpose container, but the same generator can make small parts jars, hardware containers, storage bottles, prop containers, decorative bottles, and larger screw-top canisters.
🧴 Output Mode
Choose exactly what the generator displays:
| Setting | What it does |
|---|---|
| Bottle Only | Generates only the threaded bottle |
| Cap Only | Generates only the matching cap |
| Bottle and Cap | Places both parts in a printable layout |
| Assembled Preview | Shows the cap installed on the bottle |
| Exploded Preview | Separates the parts vertically so the thread alignment can be inspected |
📐 Bottle Settings
| Setting | What it controls |
| Bottle Diameter | Overall width of the main bottle body |
| Bottle Height | Overall height of the body below the shoulder |
| Wall Thickness | Thickness of the bottle’s outer walls |
| Bottom Thickness | Thickness of the solid printable base |
| Shoulder Height | Height of the transition between the body and neck |
| Shoulder Style | Changes how sharply or smoothly the bottle narrows |
| Neck Diameter | Outer diameter of the bottle neck before threading |
| Neck Height | Available threaded height above the bottle shoulder |
| Bottom Edge Radius | Rounds the outside bottom edge while keeping the base flat |
The internal cavity automatically follows the exterior dimensions while preserving the selected wall and bottom thicknesses.
🔩 Thread Settings
| Setting | What it controls |
| Thread Pitch | Vertical distance between each thread rotation |
| Thread Depth | How far the thread extends from the neck |
| Thread Clearance | Radial space between the bottle and cap threads |
| Thread Direction | Generates right-hand or left-hand threads |
| Thread Profile | Controls the printable shape of the thread |
| Thread Resolution | Controls the smoothness of the helical geometry |
The bottle and cap threads automatically extend through the usable neck and cap height. This allows the cap to catch immediately at the opening instead of having the first usable thread buried inside the cap.
The default thread profile is designed around FDM printing rather than using an excessively sharp mechanical V-thread that may look accurate in CAD but print poorly.
🛑 Cap-Stop Collar
The bottle includes a collar directly below the threaded neck. This gives the cap a solid stopping surface and prevents it from being tightened past the useful thread engagement.
| Setting | What it controls |
| Collar Height | Vertical thickness of the stop collar |
| Collar Overhang | How far the collar extends beyond the cap |
| Collar Lower Bevel | Softens the lower outside edge of the collar |
The upper collar surface remains flat so the cap always stops at a consistent height.
🧢 Cap Settings
| Setting | What it controls |
| Cap Height | Total height of the screw-on cap |
| Cap Wall Thickness | Thickness surrounding the internal thread |
| Cap Top Thickness | Thickness of the closed top surface |
| Cap Clearance | Additional fit allowance between the cap and bottle |
| Grip Style | Selects the exterior cap texture |
| Grip Depth | Controls how strongly the grip pattern projects |
| Grip Count | Adjusts the number of ribs or scallops |
| Top Style | Selects a flat, raised, recessed, or rounded top |
| Cap Edge Radius | Rounds the outside top edge |
Available Grip Styles
- Smooth
- Vertical Ribbed
- Hex
- Scalloped
The cap is automatically placed open-side-up in the preview and flipped into a printable orientation when using the separated print layout.
🔒 Seal Options
| Setting | What it does |
| No Seal | Uses only the threaded cap and bottle lip |
| Compression Ring | Adds a raised contact ring beneath the cap top |
| Internal Plug | Adds a plug that enters the bottle opening when tightened |
The seal features can improve closure alignment, but actual liquid sealing depends heavily on printer accuracy, material, layer quality, and the selected clearance. This generator is not intended for pressurized containers.
🖨️ Fit Adjustment
The default thread clearance is intended as a practical starting point for normal FDM printing. Increase the clearance when the cap is too tight or decrease it when the fit is excessively loose.
Different printers, materials, nozzle sizes, extrusion settings, and part cooling can all affect the final fit. A small test bottle is recommended before generating a very large container.
⚠️ Important Use Notes
This tool creates general-purpose printed containers. Printed parts should not automatically be considered watertight, airtight, food-safe, chemically resistant, or suitable for pressure. Suitability depends on the selected material, printer, coating, and intended use.
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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