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Straight 3D Models: Fittings, Gears, Ladders, Rails

This collection gathers 3D models whose geometry follows a single straight axis: threaded fittings, gears, ladders, brackets and rail sections. Each entry leads to a source page where the author describes the part. It helps when you need a straight STL piece for a repair, a build or a spare component. Polyzon does not confirm whether models are free, their price, license, official status, affiliation, safety or fitness. Check the current terms at the source.

Esta colección está escrita en inglés, pero la búsqueda funciona en cualquier idioma.

Una colección de Polyzon · 47 modelos de 5 plataformas

Cómo se elabora esta colección

Polyzon reúne esta colección a partir de los resultados de búsqueda de las plataformas conectadas. Se eliminan los duplicados y los modelos sin vista previa, las coincidencias débiles van al final y el resto mantiene el orden de la búsqueda. Los modelos pertenecen a sus autores: consulta las condiciones en la página de cada modelo.

Criterios de selección: el equipo editorial de Polyzon · Texto actualizado el 13/10/2026

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«Straight 3D Models: Fittings, Gears, Ladders, Rails»

Straight threaded fittings appear in several combinations: male-to-male, male-to-female and female-to-female, sometimes assembled from three pieces. Straight gears, hinges and brackets belong to mechanical and furniture work, while ladders, rails and track sections serve access or hobby layouts. The main differences between them are the connection type, the thread or profile standard, and the number of parts in the assembly.

On the author's model page, look at the dimensions and scale first, then at the thread or profile standard if the part has to connect to something else. Check how many parts the model contains, how they join, and whether the author notes that supports are needed. The material and print settings listed by the author, together with photos of real prints, tell you more than a render does.

To widen the search, try synonyms such as in-line, linear or direct next to the part name, and combine them with the standard or size you need. Related topics include adapters, couplings, racks, rails, brackets and clamps. Searching by the connection type instead of the shape often returns more results.

FAQ

Preguntas frecuentes

What does "straight" mean in these model names?
It describes a part whose axis stays on one line, without a bend or elbow. The term is used for fittings, ladders, gears and rails that run in a single direction.
How do I choose the right thread size for a straight fitting?
Read the standard and diameter given on the model page and compare them with the part you want to join. Measuring the mating thread before printing saves a second attempt.
Can a straight model be scaled to another size?
Scaling changes wall thickness and thread pitch, so a scaled fitting may no longer match its counterpart. Check the stated dimensions rather than assuming that any scale will work.
What should I check before printing a straight gear or bracket?
Look at the number of parts, the orientation the author shows, and any note about supports. The material and settings in the description give a starting point for your own setup.
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