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Featured Model of the Day

Round-to-Rectangular Tube Adapter STL 3D file ⌀40 mm to 77×33 mm, thickness 3 mm 📦 #2199

1 object(s) - format STL

gizmo

Latest user-generated 3D models

Round air vent STL file ∅ 250 mm, slat angle: 10° with central reinforcement 📦 #11169

1 object(s) - format STL

gizmo

From the Blog

Why Modeling Strategy Matters in Procedural CAD Modeling

2025-12-14 · 3D Modeling · sylvain
why Modeling Strategy Matters in Procedural CAD Modeling why Modeling Strategy Matters in Procedural CAD Modeling

Why does modeling strategy matter so much in procedural CAD? Two scripts can produce the exact same geometry while showing very different generation times.

Using a concrete build123d example, this article explains why certain operations, such as fillets, become expensive when repeated at scale, and how a simple change in approach can drastically reduce computation time.

A clear overview of the key challenges in procedural modeling, highlighting the direct impact of design choices on CAD engine performance.

Read the article

A selection of custom 3D models

📦 Model #3612

1 object(s)
- format STL
Protective grid STL 3D file, center-to-center: 210x110mm, mesh: 10mm - Ø5mm
Protective grid STL 3D file, center-to-center: 210x110mm, mesh: 10mm - Ø5mm
Download this rectangular protective honeycomb grid model in STL format. Mounting holes are placed at the four corners (center-to-center 210x110 mm), each with a diameter of Ø5 mm. The overall dimensions reach 220x120 mm, with very large 10 mm cell size for peak ventilation. This grid serves as both a protective guard and a ventilation panel.
Parameter Value Unit
length or center-to-center 210 mm
width or center-to-center 110 mm
mesh size 10 mm
dual color no
holes yes
hole diameter 5 mm

📦 Model #2054

1 object(s)
- format STL
Round air vent STL 3D file ∅ 71 mm, slat angle: 40° with central reinforcement
Round air vent STL 3D file ∅ 71 mm, slat angle: 40° with central reinforcement
Model of a round air vent for ventilation in STL format. Its insertion diameter measures 71 mm. The slats have an angle of 40° and a high thickness of 2.4 mm. A centered vertical reinforcement reinforces the slats. This 3D aeration grille has a thin flange of 4 mm. The full diameter of the model is 79 mm.
Parameter Value Unit
male diameter 71 mm
slat angle 40 °
slat thickness 2.4 mm
flange width 4 mm
central reinforcement yes

📦 Model #3095

1 object(s)
- format STL
Honeycomb grille STL 3D file, center-to-center: 192x81mm, mesh: 8mm - Ø4mm
Honeycomb grille STL 3D file, center-to-center: 192x81mm, mesh: 8mm - Ø4mm
3D rectangular protective grid model as a STL file. Mounting holes are placed at the four corners (center-to-center 192x81 mm), each with a diameter of Ø4 mm. The overall dimensions reach 200x89 mm, with large 8 mm cell size for optimal air circulation. This type of grid provides mechanical protection and ventilation.
Parameter Value Unit
length or center-to-center 192 mm
width or center-to-center 81 mm
mesh size 8 mm
dual color no
holes yes
hole diameter 4 mm

📦 Model #3848

1 object(s)
- format STL
O-ring STL file ID 60 × CS 5 mm
O-ring STL file ID 60 × CS 5 mm
3D model in STL format of sealing ring with dimensions ID 60 mm / CS (cross section) 5  mm. The outer diameter resulting is therefore 70 mm.
Parameter Value Unit
inner diameter (ID) 60 mm
cross section (CS) 5 mm

📦 Model #2206

3 object(s)
- format STL
Small parts organizer with 16 drawers 30×30×80 mm STL file, thickness: 2 mm
Small parts organizer with 16 drawers 30×30×80 mm STL file, thickness: 2 mm
View of object #0
Model of a multi-drawer box in STL format. This model contains 16 boxes, arranged in 2 rows and 8 columns. In detail, this means 2 rows of 8 boxes. Each box comes with an inner space of 30 mm wide, 30 mm high, and 80 mm deep. The wall thickness is 2 mm. The boxes come with 2 dividers each, which allows up to 3 compartments per box and up to 48 sections in total. The overall dimensions of the structure measure 294 x 71 x 86 mm. All the objects in this model were designed to be printed without support generation.
Parameter Value Unit
number of rows 2
number of columns 8
inner drawer depth 80 mm
inner drawer width 30 mm
inner drawer height 30 mm
wall thickness 2 mm
removable divider two divider ...

📦 Model #3491

1 object(s)
- format STL
Protective grid STL file, center-to-center: 107x107mm, mesh: 10mm - Ø5mm
Protective grid STL file, center-to-center: 107x107mm, mesh: 10mm - Ø5mm
3D square protective honeycomb grid model as a STL file. Mounting holes are placed at the four corners (center-to-center 107x107 mm), each with a diameter of Ø5 mm. The overall dimensions reach 117x117 mm, with very large 10 mm cell size for maximum airflow. This grid serves as both a protective guard and a ventilation panel.
Parameter Value Unit
length or center-to-center 107 mm
width or center-to-center 107 mm
mesh size 10 mm
dual color no
holes yes
hole diameter 5 mm

📦 Model #1483

1 object(s)
- format STL
Tube adapter STL file ⌀ 200–50 mm (Length: 80 mm)
Tube adapter STL file ⌀ 200–50 mm (Length: 80 mm)
Tube reducer ⌀200 mm to ⌀50 mm in STL 3D format. Total length of this junction is 80 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a sleeve length of 30 mm, the smaller one of 30 mm as well. The ends have no fillet.
Parameter Value Unit
side A length 30 mm
side A outer diameter 200 mm
side A thickness 3 mm
side B length 30 mm
side B outer diameter 50 mm
side B thickness 3 mm
transition length 20 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #3704

1 object(s)
- format STL
Washer / Flat Gasket STL file ⌀ID: 4 mm ⌀OD: 10 mm thickness: 2.6 mm + chamfer
Washer / Flat Gasket STL file ⌀ID: 4 mm ⌀OD: 10 mm thickness: 2.6 mm + chamfer
Model of washer / gasket in STL 3D file format. This model features an inner diameter of ⌀4 mm and an outer diameter of ⌀10 mm. The part thickness is 2.6 mm. A chamfer is present on the outer diameter with a value of 2 mm.
Parameter Value Unit
inner diameter 4 mm
outer diameter 10 mm
thickness 2.6 mm
finish chamfer
finish position outer
sides one side
finish value 2 mm

📦 Model #4201

1 object(s)
- format STL
Washer / Flat Gasket STL 3D file ⌀ID: 3.9 mm ⌀OD: 6.9 mm thickness: 4.3 mm
Washer / Flat Gasket STL 3D file ⌀ID: 3.9 mm ⌀OD: 6.9 mm thickness: 4.3 mm
3D model of washer / gasket in STL 3D file format. This part features an inner diameter of ⌀3.9 mm and an outer diameter of ⌀6.9 mm. The total thickness is 4.3 mm. This part has no finish applied.
Parameter Value Unit
inner diameter 3.9 mm
outer diameter 6.9 mm
thickness 4.3 mm
finish none

📦 Model #4016

1 object(s)
- format STL
Protective grid STL 3D file, 200x120mm, mesh: 4mm
Protective grid STL 3D file, 200x120mm, mesh: 4mm
Download this 3D rectangular honeycomb grid as a STL file. The overall size is 200x120 mm, with standard 4 mm cell size for versatile use. This type of grid serves both protection and ventilation roles.
Parameter Value Unit
length or center-to-center 200 mm
width or center-to-center 120 mm
mesh size 4 mm
dual color no
holes no

📦 Model #2390

1 object(s)
- format STL
Round air vent STL 3D file ∅ 115 mm, slat angle: 45°
Round air vent STL 3D file ∅ 115 mm, slat angle: 45°
3D file of a round grille for air circulation in STL format. Its male diameter is 115 mm. The slats have an angle of 45° and a high thickness of 2 mm. This ventilation grille has a collar of 10 mm. The full diameter of this model is 135 mm.
Parameter Value Unit
male diameter 115 mm
slat angle 45 °
slat thickness 2 mm
flange width 10 mm
central reinforcement no

📦 Model #2841

1 object(s)
- format STL
Mounting bracket 200×150 mm STL 3D file, thickness 8 mm, hole diameter 6 mm
Mounting bracket 200×150 mm STL 3D file, thickness 8 mm, hole diameter 6 mm
File of a support bracket with a reinforcing bar in STL 3D format. The dimensions are 200 mm in length, 150 mm in height, 20 mm in width, and 8 mm in thickness. The mounting holes have a diameter of 6 mm. Chamfers are done to the holes to seat the screw heads. The reinforcing bar enhances mechanical strength and provides two openings for fastening. No support is needed to print this bracket, lying flat on the print bed.
Parameter Value Unit
length 200 mm
height 150 mm
width 20 mm
thickness 8 mm
hole diameter 6 mm
chamfer on the holes yes

📦 Model #2288

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 160–110 mm (Length: 65 mm)
Tube adapter STL 3D file ⌀ 160–110 mm (Length: 65 mm)
Tube adapter ⌀160 mm to ⌀110 mm in STL 3D format. Total length of this fitting is 65 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a length of 30 mm, the smaller one of 30 mm as well. The ends are raw.
Parameter Value Unit
side A length 30 mm
side A outer diameter 160 mm
side A thickness 3 mm
side B length 30 mm
side B outer diameter 110 mm
side B thickness 3 mm
transition length 5 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #2384

1 object(s)
- format STL
Round air vent STL file ∅ 80 mm, slat angle: 45° with central reinforcement
Round air vent STL file ∅ 80 mm, slat angle: 45° with central reinforcement
File of a round air vent for ventilation in STL format. Its male diameter is 80 mm. The slats have an angle of 45° and a high thickness of 2 mm. A vertical reinforcement reinforces the whole structure. This 3D vent grille features a prominent flange of 20 mm. The overall diameter of the model is 120 mm.
Parameter Value Unit
male diameter 80 mm
slat angle 45 °
slat thickness 2 mm
flange width 20 mm
central reinforcement yes

📦 Model #4144

1 object(s)
- format STL
Honeycomb grille STL 3D file, 195x80mm, mesh: 4mm
Honeycomb grille STL 3D file, 195x80mm, mesh: 4mm
Download this 3D rectangular protective grid file in STL format. The overall size is 195x80 mm, with medium 4 mm cell size for versatile use. This grid provides both mechanical protection and airflow.
Parameter Value Unit
length or center-to-center 195 mm
width or center-to-center 80 mm
mesh size 4 mm
dual color no
holes no

📦 Model #3025

1 object(s)
- format STL
Honeycomb grid STL file, 200x120mm, mesh: 10mm
Honeycomb grid STL file, 200x120mm, mesh: 10mm
Rectangular grid model as a STL file. The overall size is 200x120 mm, with extra wide 10 mm cell size for peak ventilation. This type of grid provides mechanical protection and ventilation.
Parameter Value Unit
length or center-to-center 200 mm
width or center-to-center 120 mm
mesh size 10 mm
dual color no
holes no

📦 Model #3502

1 object(s)
- format STL
Protective grid STL 3D file, 60x60mm, mesh: 8mm
Protective grid STL 3D file, 60x60mm, mesh: 8mm
Download this 3D square honeycomb grid model in STL format. The overall size is 60x60 mm, with wide 8 mm cell size for optimal air circulation. This type of grid serves both protection and ventilation roles.
Parameter Value Unit
length or center-to-center 60 mm
width or center-to-center 60 mm
mesh size 8 mm
dual color no
holes no

📦 Model #3607

1 object(s)
- format STL
Tube elbow STL file 65° ⌀OD: 102 mm ⌀ID: 99 mm thickness: 1.5 mm
Tube elbow STL file 65° ⌀OD: 102 mm ⌀ID: 99 mm thickness: 1.5 mm
3D file of a pipe elbow with a 65° angle in STL format. This pipe elbow features an external diameter of 102 mm and an internal diameter of 99 mm. This results in a tube thickness of 1.5 mm.
Parameter Value Unit
outer diameter 102 mm
inner diameter 99 mm
angle 65 °
end fillets no

📦 Model #2202

1 object(s)
- format STL
O-ring STL 3D file ID 32 × CS 4 mm
O-ring STL 3D file ID 32 × CS 4 mm
STL file of O-ring (torus-shaped seal) with dimensions Inner diameter 32 mm / CS (cross section) 4  mm. Outer diameter (OD) corresponds to 40 mm.
Parameter Value Unit
inner diameter (ID) 32 mm
cross section (CS) 4 mm

📦 Model #4396

1 object(s)
- format STL
Honeycomb grid STL file, 250x250mm, mesh: 10mm
Honeycomb grid STL file, 250x250mm, mesh: 10mm
Square grid model as a STL file. The overall size is 250x250 mm, with very large 10 mm cell size for maximum airflow. This grid serves as both a protective guard and a ventilation panel.
Parameter Value Unit
length or center-to-center 250 mm
width or center-to-center 250 mm
mesh size 10 mm
dual color no
holes no

📦 Model #4414

2 object(s)
- format STL
Round box with lid STL 3D file ⌀ 134 mm - Height: 20 mm, Shell: 2 mm
Round box with lid STL 3D file ⌀ 134 mm - Height: 20 mm, Shell: 2 mm
View of object #0
Get this circular box model in 3D STL format. Its diameter is 134 mm and its total height is 20 mm. The wall thickness is 2 mm. A fillet located at the bottom of the box makes it easier to grip objects.
Parameter Value Unit
external diameter 134 mm
total height 20 mm
wall thickness 2 mm
fit clearance 0.2 mm
inner bottom fillet 1 mm

📦 Model #4497

1 object(s)
- format STL
Tubing adapter STL 3D file ⌀ 32–19 mm (Length: 65 mm)
Tubing adapter STL 3D file ⌀ 32–19 mm (Length: 65 mm)
Tube fitting ⌀32 mm to ⌀19 mm in STL 3D format. Length of this junction is 65 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 35 mm, the smaller one of 20 mm. The ends are not rounded.
Parameter Value Unit
side A length 35 mm
side A outer diameter 32 mm
side A thickness 2 mm
side B length 20 mm
side B outer diameter 19 mm
side B thickness 2 mm
transition length 10 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #3916

1 object(s)
- format STL
Tubing adapter STL file ⌀ 77–30 mm (Length: 140 mm)
Tubing adapter STL file ⌀ 77–30 mm (Length: 140 mm)
Tube fitting ⌀77 mm to ⌀30 mm in STL format. Length of this sleeve is 140 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a length of 30 mm, the smaller one of 50 mm. The ends are raw.
Parameter Value Unit
side A length 30 mm
side A outer diameter 77 mm
side A thickness 3 mm
side B length 50 mm
side B outer diameter 30 mm
side B thickness 3 mm
transition length 60 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #3711

2 object(s)
- format STL
Enclosure with screw-mounted lid STL 3D file: 70×45×30 mm (with ventilation on the lid and under the enclosure)
Enclosure with screw-mounted lid STL 3D file: 70×45×30 mm (with ventilation on the lid and under the enclosure)
View of object #0
Enclosure model with screwed lid in 3D STL format. The dimensions are 70 mm long by 45 mm wide and 30 mm high. The lid only measures 10 mm high. Side thickness is 3 mm. This enclosure features marked cooling area on the lid and under the base.
Parameter Value Unit
length 70 mm
width 45 mm
total height 30 mm
lid height 10 mm
wall thickness 3 mm
screw margin 0 mm
fit clearance 0.1 mm
cooling level 010
cooling zone(s) cutouts on b...

📦 Model #4475

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 40–37 mm (Length: 118 mm)
Tube adapter STL 3D file ⌀ 40–37 mm (Length: 118 mm)
Straight tube fitting ⌀40 mm to ⌀37 mm in STL format. Total length of this connector is 118 mm. The thickness of the tubes is identical: 5 mm. The larger-diameter tube has a sleeve length of 38 mm, the smaller one of 40 mm. The ends have a fillet to make tube connection easier.
Parameter Value Unit
side A length 38 mm
side A outer diameter 40 mm
side A thickness 5 mm
side B length 40 mm
side B outer diameter 37 mm
side B thickness 5 mm
transition length 40 mm
axis offset 0 mm
ends fillet fillet on bo...

📦 Model #2757

2 object(s)
- format STL
Small parts organizer with 5 drawers 65×25×25 mm STL 3D file, thickness: 2 mm
Small parts organizer with 5 drawers 65×25×25 mm STL 3D file, thickness: 2 mm
View of object #0
Download this 3D file of a storage box with drawers in STL format. This model features 5 compartments, arranged in 5 rows and 1 columns. Specifically, this means 5 rows of 1 compartments. Each compartment measures 65 mm wide, 25 mm high, and 25 mm deep. The wall thickness is 2 mm. The overall dimensions of the structure come to 73.5 x 149.5 x 31 mm. All the objects in this model are intended to be printed without support.
Parameter Value Unit
number of rows 5
number of columns 1
inner drawer depth 25 mm
inner drawer width 65 mm
inner drawer height 25 mm
wall thickness 2 mm
removable divider none

📦 Model #4476

1 object(s)
- format STL
Tubing adapter STL 3D file ⌀ 40–37 mm (Length: 115 mm)
Tubing adapter STL 3D file ⌀ 40–37 mm (Length: 115 mm)
Tube adapter ⌀40 mm to ⌀37 mm in STL 3D format. Length of this connector is 115 mm. The thickness of the tubes is identical: 5 mm. The larger-diameter tube has a sleeve length of 35 mm, the smaller one of 40 mm. The ends are rounded to facilitate the connection of the two tubes.
Parameter Value Unit
side A length 35 mm
side A outer diameter 40 mm
side A thickness 5 mm
side B length 40 mm
side B outer diameter 37 mm
side B thickness 5 mm
transition length 40 mm
axis offset 0 mm
ends fillet fillet on bo...

📦 Model #3057

1 object(s)
- format STL
Right-angle bracket 150×150 mm STL 3D file, thickness 6 mm, hole diameter 6 mm
Right-angle bracket 150×150 mm STL 3D file, thickness 6 mm, hole diameter 6 mm
3D file of a mounting bracket with a central reinforcement in STL format. The dimensions are 150 mm in length, 150 mm in height, 14 mm in width, and 6 mm in thickness. The screw holes are designed with a diameter of 6 mm. Chamfers are applied to the holes to improve the seating of the heads. The central reinforcement bar reduces bending and provides two clearances for screwdriver access. No support is needed to print this bracket, printed flat on the build plate.
Parameter Value Unit
length 150 mm
height 150 mm
width 14 mm
thickness 6 mm
hole diameter 6 mm
chamfer on the holes yes

📦 Model #4503

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 125–80 mm (Length: 105 mm)
Tube adapter STL 3D file ⌀ 125–80 mm (Length: 105 mm)
Straight tube coupler ⌀125 mm to ⌀80 mm in STL format. Total length of this junction is 105 mm. The thickness of the tubes is identical: 5 mm. The larger-diameter tube has a sleeve length of 35 mm, the smaller one of 40 mm. The ends are raw.
Parameter Value Unit
side A length 35 mm
side A outer diameter 125 mm
side A thickness 5 mm
side B length 40 mm
side B outer diameter 80 mm
side B thickness 5 mm
transition length 30 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #1961

2 object(s)
- format STL
Round box with lid STL 3D file ⌀ 120 mm - Height: 170 mm, Shell: 3 mm
Round box with lid STL 3D file ⌀ 120 mm - Height: 170 mm, Shell: 3 mm
View of object #0
Get this circular organizing box in 3D STL format. Its diameter is 120 mm and its height is 170 mm. The walls have a thickness of 3 mm. A fillet located at the bottom of the box makes it easier to grip objects located inside.
Parameter Value Unit
external diameter 120 mm
total height 170 mm
wall thickness 3 mm
fit clearance 1 mm
inner bottom fillet 2 mm

STL: Advantages and Disadvantages for 3D Printing

The STL format is, without question, a cornerstone of 3D printing. This exchange format has established itself as the universal standard for representing 3D models ever since the early days of stereolithography. Its main strength lies in its simplicity: it describes the surface of an object using countless small triangles that form a mesh. This approach, known as tessellation, makes STL 3D files universally compatible with nearly all CAD software and slicers. If you’d like to learn more about this format, check out our article STL: What Is This 3D File Format?.

One of the major advantages of the format lies in this universality: whether you’re using a complex modeling program or a simpler design tool, you can export your 3D models in STL 3D format with near certainty that they’ll be interpreted correctly by your 3D printer. This ease of exchange has played a key role in the widespread adoption of 3D printing, allowing anyone to share and print objects without worrying about software compatibility. Once again, simplicity is its greatest strength.

However, that same simplicity also brings certain limitations. The triangle mesh, while effective for describing geometry, contains no information about colors, textures, or materials. For more advanced projects requiring these details, the STL format starts to show its weaknesses. Additionally, print quality depends directly on the fineness of the tessellation: too few triangles can lead to rough or faceted surfaces, while an overly dense mesh can make the file unnecessarily heavy.

Another notable drawback is the lack of unit management. An STL file doesn’t specify whether dimensions are in millimeters, centimeters, or inches, which can sometimes cause scaling errors when importing into a slicer. Despite these limitations, the STL format remains the go-to standard for converting your 3D models into G-code — the language your printer understands. It continues to be the preferred choice for its robustness and broad compatibility, even as newer formats like 3MF emerge for more specialized needs.

What is parametric modeling?

Parametric modeling is a fundamental approach in computer-aided design (CAD) that reshapes how 3D models are created and managed. Far from being a simple drawing technique, it represents a genuine design philosophy where objects are defined not by fixed shapes, but by variables and intelligent relationships.

This method makes it possible to modify the length, width, or diameter of a part and have the entire design adapt automatically, without the need to redraw everything. At the core of the process are parameters—numerical values (length, angle, thickness, etc.)—linked together through constraints and formulas. For instance, the diameter of a hole can be defined as half the width of a plate; if the width changes, the hole’s diameter instantly adjusts, ensuring the consistency of the design. This interdependence makes 3D models flexible and responsive to changes. One of the main advantages of parametric modeling lies in its ability to simplify customization and enable rapid iteration of designs.

Whether through modeling software such as Fusion 360 or FreeCAD, or through code-based libraries like build123d, this approach allows effortless exploration of a wide range of variations. Such flexibility is especially valuable across multiple fields—from mechanical engineering and architecture to consumer product design. It saves considerable time, reduces errors, and improves the performance of parts.

By defining design intent from the start through these parameters and constraints, the model preserves its integrity and functionality even after numerous modifications. It is a powerful way to transform an idea into a tangible object, ready to adapt to new situations.