Parametric Auto-Labeled Female UNC Hose Adapter

Boost Me If this model is useful for your workshop, prototypes, hose routing or custom threaded connections, a Boost would be greatly appreciated.

It helps me keep developing practical, tested and fully parametric functional parts. Description

This is the Inch Preset Version of a fully parametric straight barbed hose-to-female-thread adapter with:

- adjustable female thread fitting clearance - automatic engraved size identification - automatic structural protection - real printable UNC thread geometry Unlike fixed-tolerance models, this adapter includes a dedicated FIT_OFFSET parameter that allows the female UNC thread clearance to be adjusted directly in OpenSCAD / MakerWorld Customizer.

This makes it possible to compensate for:

- printer dimensional accuracy - extrusion calibration - material shrinkage - filament type - layer height - mating male UNC thread tolerance - thread coating or surface finish - the desired tight or free-running fit Each generated fitting automatically includes:

- the selected UNC female thread engraved on one hex face, for example 3/4-10 UNC - the selected hose internal diameter engraved on an adjacent face, for example 1/2" - a user-adjustable female thread fitting allowance - a continuous internal passage - automatic minimum wall protection The labels update automatically whenever the Customizer parameters are changed.

This makes every printed fitting immediately identifiable and allows the threaded fit to be tuned without manually editing the model or relying only on slicer compensation.

There is no need to:

- manually convert fractional dimensions - calculate thread pitch - remodel the internal thread - add identification text - rename the model - measure the fitting after printing The model is designed to connect a flexible rubber, silicone or soft PVC hose to a male UNC threaded component.

It combines five main functional features:

- a parametric barbed hose connection - an imperial hexagonal wrench section - an internal UNC female thread - adjustable female thread fitting clearance - automatic engraved size identification All main dimensions are selected through practical fractional-inch presets.

The user does not need to manually convert fractions into decimal inches or millimeters.

The fitting allowance is adjusted in millimeters because small dimensional corrections are easier and more precise to control in metric increments.

The model can be customized directly in OpenSCAD / MakerWorld Customizer by selecting only seven essential parameters.

The remaining technical dimensions are calculated automatically, including:

- barb diameter - barb height - number of barbs - thread diameter - thread pitch from TPI - thread length - effective female thread clearance - internal passage - minimum wall thickness - minimum threaded sleeve diameter - minimum hexagonal size - engraved thread label - engraved hose diameter label The geometry is generated internally in millimeters, while the Customizer displays familiar fractional-inch values.

The complete adapter maintains a minimum radial wall thickness of 1.8 mm beneath the barb roots, around the female thread and across the hexagonal faces.

If the selected dimensions or fitting allowance require a larger body, the generator automatically adjusts the threaded sleeve and hexagonal section to preserve the required structural thickness.

Main Unique Features

Adjustable Female Thread Fit

The female UNC thread includes a dedicated:

FIT_OFFSET

parameter.

FIT_OFFSET controls the total diametral clearance added to the internal thread.

This allows the same UNC preset to be adapted to:

- different printers - different materials - different mating components - different tolerance classes - different surface coatings - different preferred assembly clearances Recommended starting values:

FIT_OFFSET Expected result

0.30 mm Precise fit for a calibrated printer

0.50 mm Recommended general-purpose default

0.60–0.70 mm Freer fit for shrink-prone materials or slight overextrusion

0.80–1.00 mm Intentionally loose and highly permissive fit

Increasing FIT_OFFSET enlarges the female thread clearance without changing:

- nominal UNC diameter - threads per inch - engraved thread designation - hose preset - thread standard Example:

3/4-10 UNC

remains:

- 3/4 inch nominal diameter - 10 threads per inch - Unified National Coarse standard FIT_OFFSET only changes the printable clearance around the mating male thread.

This feature is particularly useful because commercial UNC components may use:

- different tolerance classes - different coatings - different surface finishes - slightly different real-world diameters Automatic Engraved Identification

The complete UNC female thread designation and hose size are automatically engraved on two adjacent flat faces of the hexagonal body.