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NB300 3D Models: Fittings, RC Planes, Helmet STLs

The NB300 collection mixes several unrelated things that share the same number or bore label: pipe fittings and valves, RC park flyers, themed helmets and 300 mm hardware. It is useful when you already know which of those groups you want and need to compare the files inside it. Each entry links to a model page, so the details that matter for 3D printing sit with the author rather than here. Polyzon does not confirm whether models are free, their price, license, official status, affiliation, safety or fitness. Check the current terms at the source.

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Criterios de selección: el equipo editorial de Polyzon · Texto actualizado el 11/10/2026

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«NB300 3D Models: Fittings, RC Planes, Helmet STLs»

The pipe and valve group is the largest: equal tees, strainers, globe and ball valves labelled by nominal bore, from small sizes up to 300NB. These differ mainly in how they connect — threaded, flanged or tri-part bodies — and in wall thickness. The other groups are unrelated to piping: RC park flyers with printed airframes, Spartan-style helmets and figures for display or costume use, and utility parts such as junction boxes, projector holders and camera mounts sized in millimetres. A separate set covers 300 x 300 mm bed test plates used to check a 3D printer's first layer and levelling.

When choosing a file, open the author's page and read what is actually specified. For fittings and valves, check the nominal bore, the thread or flange standard, the number of parts and how they join. For helmets and figures, look at scale, part count, whether supports are needed and how the pieces align. For mounts and enclosures, confirm the internal dimensions and screw positions. For RC airframes, check the wingspan, the material the author lists and the settings used in the photos of real prints.

To narrow the results, try the synonyms that authors actually use: nominal bore, DN, NB, pipe tee, globe valve, ball valve, strainer, flange. For aircraft, search park flyer, warbird, scale plane or printed airframe instead of a single model name. For costume items, terms like cosplay armour, helmet kit or display bust bring up related files. If you are after hardware, add the millimetre size or the device the part holds, and combine it with the word mount, bracket or enclosure.

FAQ

Preguntas frecuentes

What does NB300 mean in these titles?
NB usually stands for nominal bore, a pipe sizing label, so NB300 points to a fitting or valve around that bore. In other titles the same number refers to a 300 mm dimension or to a themed subject, so read the full title before assuming.
How do I find a fitting that matches a pipe I already have?
Search by nominal bore plus the connection type, such as threaded, flanged or tri-part. Then check the author's page for the bore, thread standard and wall thickness, since two files with the same label can differ.
Can a 300 mm part be scaled down for a smaller 3D printer?
Scaling changes wall thickness and any threads or screw holes along with the outer size. If the part must fit something else, scale the model in the slicer only after checking which dimensions are critical.
What should I check before printing a helmet or figure?
Look at the scale, the number of parts, how they align and whether the author shows supports in the photos. Material and layer height affect weight and finish, so compare the listed settings with your own setup.
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