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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

Multi-compartment box STL file: 77 compartments of 12×10×15 mm 📦 #11215

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 #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 #2376

1 object(s)
- format STL
Tube adapter STL file ⌀ 152–98 mm (Length: 190 mm)
Tube adapter STL file ⌀ 152–98 mm (Length: 190 mm)
Inline sleeve ⌀152 mm to ⌀98 mm in STL 3D format. Total length of this fitting is 190 mm. The thickness of the tubes is identical: 5 mm. The larger-diameter tube has a length of 60 mm, the smaller one of 100 mm. The ends have a fillet to make tube connection easier.
Parameter Value Unit
side A length 60 mm
side A outer diameter 152 mm
side A thickness 5 mm
side B length 100 mm
side B outer diameter 98 mm
side B thickness 5 mm
transition length 30 mm
axis offset 0 mm
ends fillet fillet on bo...

📦 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 #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 #2118

1 object(s)
- format STL
Round air vent STL file ∅ 100 mm, slat angle: 45° with central reinforcement
Round air vent STL file ∅ 100 mm, slat angle: 45° with central reinforcement
3D file of a round air vent for ventilation in STL format. Its male diameter is 100 mm. The slats have an angle of 45° and a high thickness of 2 mm. A centered vertical reinforcement strengthens the slats. This 3D aeration grille has a thin flange of 3 mm. The overall diameter of the model is 106 mm.
Parameter Value Unit
male diameter 100 mm
slat angle 45 °
slat thickness 2 mm
flange width 3 mm
central reinforcement yes

📦 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 #1481

1 object(s)
- format STL
Round air vent STL file ∅ 152 mm, slat angle: 30° with central reinforcement
Round air vent STL file ∅ 152 mm, slat angle: 30° with central reinforcement
File of a round vent cover for air circulation in STL format. Its insertion diameter measures 152 mm. The slats have a slight angle of 30° and a high thickness of 2 mm. A centered vertical reinforcement strengthens the whole structure. This 3D aeration grille features a collar of 10 mm. The overall diameter of the model is 172 mm.
Parameter Value Unit
male diameter 152 mm
slat angle 30 °
slat thickness 2 mm
flange width 10 mm
central reinforcement yes

📦 Model #2461

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 127–78 mm (Length: 85 mm)
Tube adapter STL 3D file ⌀ 127–78 mm (Length: 85 mm)
Inline tube coupler ⌀127 mm to ⌀78 mm in STL 3D format. Total length of this junction is 85 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 40 mm, the smaller one of 40 mm as well. The ends are raw.
Parameter Value Unit
side A length 40 mm
side A outer diameter 127 mm
side A thickness 2 mm
side B length 40 mm
side B outer diameter 78 mm
side B thickness 2 mm
transition length 5 mm
axis offset 0 mm
ends fillet no fillet

📦 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 #2049

2 object(s)
- format STL
Small parts organizer with 1 drawer 89×89×89 mm STL 3D file, thickness: 3 mm
Small parts organizer with 1 drawer 89×89×89 mm STL 3D file, thickness: 3 mm
View of object #0
Download this model of a sorting cabinet with drawers in STL format. This model contains 1 box, arranged in 1 rows and 1 columns. Specifically, this means 1 rows of 1 boxes. Each box offers a storage volume of 89 mm wide, 89 mm high, and 89 mm deep. The wall thickness is 3 mm, which makes the structure sturdy. The total size of the structure measure 101.5 x 98.5 x 98 mm. All the objects in this model were designed to be printed without support generation.
Parameter Value Unit
number of rows 1
number of columns 1
inner drawer depth 89 mm
inner drawer width 89 mm
inner drawer height 89 mm
wall thickness 3 mm
removable divider none

📦 Model #1248

2 object(s)
- format STL
Enclosure with screw-mounted lid STL file: 200×130×60 mm (with ventilation on the lid and under the enclosure)
Enclosure with screw-mounted lid STL file: 200×130×60 mm (with ventilation on the lid and under the enclosure)
View of object #0
Download this enclosure model with lid in 3D STL format. The dimensions are 200 mm long by 130 mm wide and 60 mm high. The cover only is 10 mm high. Wall thickness is 2 mm. This enclosure has cooling area on the lid and under the base.
Parameter Value Unit
length 200 mm
width 130 mm
total height 60 mm
lid height 10 mm
wall thickness 2 mm
screw margin 0 mm
fit clearance 0.1 mm
cooling level 3
cooling zone(s) cutouts on b...

📦 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 #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 #2492

1 object(s)
- format STL
Round air vent STL 3D file ∅ 150 mm, slat angle: 40° with central reinforcement
Round air vent STL 3D file ∅ 150 mm, slat angle: 40° with central reinforcement
3D file of a round vent cover for air circulation in STL format. Its insertion diameter measures 150 mm. The slats have an angle of 40° and a low thickness of 1.6 mm. A centered vertical reinforcement secures the slats. This 3D vent grille features a flange of 7 mm. The total diameter of the model is 164 mm.
Parameter Value Unit
male diameter 150 mm
slat angle 40 °
slat thickness 1.6 mm
flange width 7 mm
central reinforcement yes

📦 Model #1994

2 object(s)
- format STL
Small parts organizer with 9 drawers 20×20×20 mm STL 3D file, thickness: 2 mm
Small parts organizer with 9 drawers 20×20×20 mm STL 3D file, thickness: 2 mm
View of object #0
Download this file of a DIY organizer in STL format. This model features 9 boxes, arranged in 3 rows and 3 columns. In detail, this means 3 rows of 3 boxes. Each box measures 20 mm wide, 20 mm high, and 20 mm deep. The wall thickness is 2 mm. The total size of the box measure 81.5 x 75.5 x 26 mm. All the objects in this model were designed to be printable without support.
Parameter Value Unit
number of rows 3
number of columns 3
inner drawer depth 20 mm
inner drawer width 20 mm
inner drawer height 20 mm
wall thickness 2 mm
removable divider none

📦 Model #4145

1 object(s)
- format STL
Honeycomb grille STL file, 195x80mm, mesh: 7mm
Honeycomb grille STL file, 195x80mm, mesh: 7mm
Download this rectangular protective grid file in STL format. The overall size is 195x80 mm, with wide 7 mm cell size to enhance ventilation. This grid acts as a protective guard while allowing airflow.
Parameter Value Unit
length or center-to-center 195 mm
width or center-to-center 80 mm
mesh size 7 mm
dual color no
holes no

📦 Model #1339

1 object(s)
- format STL
Tube adapter STL file ⌀ 61–12 mm (Length: 95 mm)
Tube adapter STL file ⌀ 61–12 mm (Length: 95 mm)
Straight sleeve ⌀61 mm to ⌀12 mm in STL format. Total length of this junction is 95 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a length of 25 mm, the smaller one of 20 mm. The two axes of the tubes are off-center by 20 mm. The ends are raw.
Parameter Value Unit
side A length 25 mm
side A outer diameter 61 mm
side A thickness 2 mm
side B length 20 mm
side B outer diameter 12 mm
side B thickness 2 mm
transition length 50 mm
axis offset 20 mm
ends fillet no fillet

📦 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 #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 #3255

1 object(s)
- format STL
Tubing adapter STL 3D file ⌀ 108–93 mm (Length: 190 mm)
Tubing adapter STL 3D file ⌀ 108–93 mm (Length: 190 mm)
Tube fitting ⌀108 mm to ⌀93 mm in STL format. Length of this sleeve is 190 mm. The thickness of the tubes is identical: 4 mm. The larger-diameter tube has a length of 100 mm, the smaller one of 75 mm. The two axes of the tubes are offset by 7.4 mm. The ends have no fillet.
Parameter Value Unit
side A length 100 mm
side A outer diameter 108 mm
side A thickness 4 mm
side B length 75 mm
side B outer diameter 93 mm
side B thickness 4 mm
transition length 15 mm
axis offset 7.4 mm
ends fillet no fillet

📦 Model #4101

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL file ⌀108 mm to 154×240 mm, thickness 3 mm + offset
Round-to-Rectangular Tube Adapter STL file ⌀108 mm to 154×240 mm, thickness 3 mm + offset
Download this model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀108 mm and a rectangular section with inner dimensions 154×240 mm. The wall thickness is 3 mm and the total length is 240 mm. The adapter has an offset of 70 mm along the Z axis. Chamfers are present on the outside of the cylindrical end and on the inside of the rectangular end.
Parameter Value Unit
cylinder outer diameter 108 mm
cylinder inlet length 20 mm
rectangle internal length 154 mm
rectangle internal height 240 mm
rectangle inlet length 50 mm
offset Z 70 mm
offset Y 0 mm
total length 240 mm
thickness 3 mm
chamfer chamfers on ...

📦 Model #2576

3 object(s)
- format STL
Small parts organizer with 4 drawers 80×80×100 mm STL file, thickness: 2 mm
Small parts organizer with 4 drawers 80×80×100 mm STL file, thickness: 2 mm
View of object #0
Download this file of a storage organizer in STL format. This model features 4 compartments, arranged in 2 rows and 2 columns. In detail, this means 2 rows of 2 compartments. Each compartment measures 80 mm wide, 80 mm high, and 100 mm deep. The wall thickness is 2 mm. The compartments include 2 dividers each, which allows up to 3 sections per compartment and up to 12 compartments in total. The external dimensions of the structure are 175 x 171 x 106 mm. All the objects in this model were designed to be printable without support generation.
Parameter Value Unit
number of rows 2
number of columns 2
inner drawer depth 100 mm
inner drawer width 80 mm
inner drawer height 80 mm
wall thickness 2 mm
removable divider two divider ...

📦 Model #2619

1 object(s)
- format STL
Round air vent STL file ∅ 76 mm, slat angle: 45°
Round air vent STL file ∅ 76 mm, slat angle: 45°
3D model of a round grille for air circulation in STL format. Its insertion diameter is 76 mm. The slats have an angle of 45° and a low thickness of 1.5 mm. This 3D vent grille features a prominent flange of 20 mm. The full diameter of this model is 116 mm.
Parameter Value Unit
male diameter 76 mm
slat angle 45 °
slat thickness 1.5 mm
flange width 20 mm
central reinforcement no

📦 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 #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 #3514

1 object(s)
- format STL
Container STL 3D file, inner: base Ø70 mm, top Ø70 mm, height 156 mm - wall thickness 4 mm
Container STL 3D file, inner: base Ø70 mm, top Ø70 mm, height 156 mm - wall thickness 4 mm
3D file of a bowl in STL format. This model can be used for sorting small parts in a workshop or on a desk. The sides are straight, providing a constant inner volume, with a inner height of 156 mm and an identical inner diameter at the top and bottom of 70 mm. The wall is particularly thick. The bowl height is 160 mm.
Parameter Value Unit
inner bottom diameter 70 mm
inner top diameter 70 mm
inner height 156 mm
wall thickness 4 mm

📦 Model #3362

1 object(s)
- format STL
Protective grid STL file, center-to-center: 65x65mm, mesh: 5mm - Ø4mm
Protective grid STL file, center-to-center: 65x65mm, mesh: 5mm - Ø4mm
Square protective honeycomb grid model as a STL file. Mounting holes are placed at the four corners (center-to-center 65x65 mm), each with a diameter of Ø4 mm. The overall dimensions reach 73x73 mm, with regular 5 mm cell size for balanced airflow and protection. This grid provides both mechanical protection and airflow.
Parameter Value Unit
length or center-to-center 65 mm
width or center-to-center 65 mm
mesh size 5 mm
dual color no
holes yes
hole diameter 4 mm

📦 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 #1664

1 object(s)
- format STL
Multi-compartment box STL 3D file: 400 compartments of 15×15×25 mm
Multi-compartment box STL 3D file: 400 compartments of 15×15×25 mm
This 3D model in STL format provides 400 storage spaces measuring 15×15×25mm each. The total dimensions are 342×342×27mm. A 3mm fillet applied to all compartments make it easier to grasp items stored in slots.
Parameter Value Unit
number of rows 20
number of columns 20
compartment length 15 mm
compartment width 15 mm
compartment height 25 mm
wall thickness 2 mm
compartment fillet (radius) 3 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.