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Featured Model of the Day

Tube STL 3D file OD 26 mm, ID 23.5 mm, length 70 mm 📦 #5566

1 object(s) - format STL

gizmo

Latest user-generated 3D models

Pipe support clip Ø31 mm STL file · Pan head screw Ø4 mm 📦 #11561

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 #2802

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL 3D file ⌀94 mm to 45.5×45.5 mm, thickness 2 mm + offset
Round-to-Rectangular Tube Adapter STL 3D file ⌀94 mm to 45.5×45.5 mm, thickness 2 mm + offset
Download this 3D model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀94 mm and a rectangular section with inner dimensions 45.5×45.5 mm. The shell thickness is 2 mm and the total length is 95 mm. The adapter has an offset of 10 mm along the Y axis and 10 mm along the Z axis. Chamfers are applied on the outside of the cylindrical end and on the inside of the rectangular end.
Parameter Value Unit
cylinder outer diameter 94 mm
cylinder inlet length 20 mm
rectangle internal length 45.5 mm
rectangle internal height 45.5 mm
rectangle inlet length 20 mm
offset Z 10 mm
offset Y 10 mm
total length 95 mm
thickness 2 mm
chamfer chamfers on ...

📦 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 #1889

1 object(s)
- format STL
Multi-compartment box STL file: 9 compartments of 83×83×50 mm
Multi-compartment box STL file: 9 compartments of 83×83×50 mm
This STL file includes 9 storage spaces measuring 83×83×50mm each. Overall dimensions of the box are 289×289×60mm. A 3mm fillet applied to all compartments provide a better grip stored in the box. The dividers are particularly robust.
Parameter Value Unit
number of rows 3
number of columns 3
compartment length 83 mm
compartment width 83 mm
compartment height 50 mm
wall thickness 10 mm
compartment fillet (radius) 3 mm

📦 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 #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 #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 #4439

1 object(s)
- format STL
Rectangular duct adapter STL 3D file 96x51.2 mm to 40x26.2 mm – transition: 55 mm
Rectangular duct adapter STL 3D file 96x51.2 mm to 40x26.2 mm – transition: 55 mm
Rectangular duct transition downloadable as STL 3D file. The internal cross-section on side A is 96x51.2 mm (rectangular), while side B is 40x26.2 mm (rectangular). Both side A and side B sleeves share the same insertion length of 30 mm. Between the two sleeves, the transition section adds 55 mm, giving an overall length of 115 mm. Inner and outer edges at both ends are left unchamfered. Relative to side A, side B is shifted by 25 mm along the Z axis.
Parameter Value Unit
side A internal width 96 mm
side A internal height 51.2 mm
sleeve length on side A 30 mm
side B internal width 40 mm
side B internal height 26.2 mm
sleeve length on side B 30 mm
thickness 2 mm
transition length 55 mm
Y offset 0 mm
Z offset 25 mm
end chamfers none

📦 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 #3674

2 object(s)
- format STL
Enclosure with screw-mounted lid STL file: 100×40×20 mm
Enclosure with screw-mounted lid STL file: 100×40×20 mm
View of object #0
Download this enclosure with screwed lid in 3D STL format. The dimensions are 100 mm long by 40 mm wide and 20 mm high. The cover is 10 mm high. Side thickness is 2 mm. The enclosure does not have cooling.
Parameter Value Unit
length 100 mm
width 40 mm
total height 20 mm
lid height 10 mm
wall thickness 2 mm
screw margin 0 mm
fit clearance 0.1 mm
cooling zone(s) no cutouts

📦 Model #2425

2 object(s)
- format STL
Small parts organizer with 228 drawers 25×25×40 mm STL 3D file, thickness: 2 mm
Small parts organizer with 228 drawers 25×25×40 mm STL 3D file, thickness: 2 mm
View of object #0
3D model of a storage case in 3D STL format. This model features 228 drawers, arranged in 19 rows and 12 columns. Specifically, this means 19 rows of 12 drawers. Each drawer provides an inside space of 25 mm wide, 25 mm high, and 40 mm deep. The wall thickness is 2 mm. The overall dimensions of the box measure 380 x 562.5 x 46 mm. All the objects in this model were designed to be printable without support.
Parameter Value Unit
number of rows 19
number of columns 12
inner drawer depth 40 mm
inner drawer width 25 mm
inner drawer height 25 mm
wall thickness 2 mm
removable divider none

📦 Model #2180

3 object(s)
- format STL
Small parts organizer with 9 drawers 70×40×120 mm STL 3D file, thickness: 2 mm
Small parts organizer with 9 drawers 70×40×120 mm STL 3D file, thickness: 2 mm
View of object #0
Download this model of a storage organizer in 3D STL format. This model contains 9 boxes, arranged in 3 rows and 3 columns. Practically speaking, this means 3 rows of 3 boxes. Each box comes with an inner space of 70 mm wide, 40 mm high, and 120 mm deep. The wall thickness is 2 mm. The boxes feature 2 dividers each, which allows up to 3 compartments per box and up to 27 compartments in total. The total size of the box come to 231.5 x 135.5 x 126 mm. All the objects in this model were designed to be printed without support.
Parameter Value Unit
number of rows 3
number of columns 3
inner drawer depth 120 mm
inner drawer width 70 mm
inner drawer height 40 mm
wall thickness 2 mm
removable divider two divider ...

📦 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 #3367

1 object(s)
- format STL
L-bracket 150×150 mm STL file, thickness 8 mm, hole diameter 6 mm
L-bracket 150×150 mm STL file, thickness 8 mm, hole diameter 6 mm
Model of a right-angle bracket with a reinforcing bar in STL 3D format. The dimensions are 150 mm in length, 150 mm in height, 20 mm in width, and 8 mm in thickness. The drill holes have a diameter of 6 mm. The reinforcing bar reduces bending and provides two passages for fastening. Support generation is not required for printing this bracket, lying flat on the print bed.
Parameter Value Unit
length 150 mm
height 150 mm
width 20 mm
thickness 8 mm
hole diameter 6 mm
chamfer on the holes no

📦 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 #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 #1267

1 object(s)
- format STL
Round air vent STL 3D file ∅ 50 mm, slat angle: 60° with central reinforcement
Round air vent STL 3D file ∅ 50 mm, slat angle: 60° with central reinforcement
File of a round air vent for air circulation in STL format. Its male diameter is 50 mm. The slats have a steep angle of 60° and a high thickness of 2.4 mm. A centered vertical reinforcement strengthens the whole structure. This aeration grille has a thin flange of 5 mm. The total diameter of this model is 60 mm.
Parameter Value Unit
male diameter 50 mm
slat angle 60 °
slat thickness 2.4 mm
flange width 5 mm
central reinforcement yes

📦 Model #4232

1 object(s)
- format STL
O-ring STL file ID 1 × CS 1.5 mm
O-ring STL file ID 1 × CS 1.5 mm
STL model of rubber ring with dimensions Inner diameter 1 mm / CS (cross section) 1.5  mm. Outer diameter (OD, for outer diameter) is therefore 4 mm.
Parameter Value Unit
inner diameter (ID) 1 mm
cross section (CS) 1.5 mm

📦 Model #1015

1 object(s)
- format STL
O-ring STL 3D file ID 7 × CS 2 mm
O-ring STL 3D file ID 7 × CS 2 mm
Model of rubber ring with dimensions Inner diameter 7 mm × thickness 2  mm. Final diameter resulting is therefore 11 mm.
Parameter Value Unit
inner diameter (ID) 7 mm
cross section (CS) 2 mm

📦 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 #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 #2524

1 object(s)
- format STL
Support bracket 210×100 mm STL 3D file, thickness 8 mm, hole diameter 6 mm
Support bracket 210×100 mm STL 3D file, thickness 8 mm, hole diameter 6 mm
3D model of a mounting bracket with a central reinforcing bar in STL format. The dimensions are 210 mm in length, 100 mm in height, 50 mm in width, and 8 mm in thickness. The screw holes have a diameter of 6 mm. Chamfers are applied to the holes to seat the screw heads. The central reinforcement bar improves rigidity and provides two clearances for screwdriver access. This bracket prints without support, printed flat directly on the build plate.
Parameter Value Unit
length 210 mm
height 100 mm
width 50 mm
thickness 8 mm
hole diameter 6 mm
chamfer on the holes yes

📦 Model #4167

1 object(s)
- format STL
Washer / Flat Gasket STL 3D file ⌀ID: 140 mm ⌀OD: 180 mm thickness: 1 mm
Washer / Flat Gasket STL 3D file ⌀ID: 140 mm ⌀OD: 180 mm thickness: 1 mm
Download this 3D model of washer / flat gasket in STL 3D file format. This model has an internal diameter of ⌀140 mm and an external diameter of ⌀180 mm. The total thickness is 1 mm. No finish is available.
Parameter Value Unit
inner diameter 140 mm
outer diameter 180 mm
thickness 1 mm
finish none

📦 Model #1096

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 149.6–99.6 mm (Length: 80 mm)
Tube adapter STL 3D file ⌀ 149.6–99.6 mm (Length: 80 mm)
Straight sleeve ⌀149.6 mm to ⌀99.6 mm in STL 3D format. Final length of this sleeve is 80 mm. The thickness of the tubes is identical: 4 mm. The larger-diameter tube has a length of 30 mm, the smaller one of 30 mm as well. The two axes of the tubes are offset by 24.9 mm. The ends feature a fillet to facilitate the connection of the two tubes.
Parameter Value Unit
side A length 30 mm
side A outer diameter 149.6 mm
side A thickness 4 mm
side B length 30 mm
side B outer diameter 99.6 mm
side B thickness 4 mm
transition length 20 mm
axis offset 24.9 mm
ends fillet fillet on bo...

📦 Model #3334

2 object(s)
- format STL
Enclosure with screw-mounted lid STL 3D file: 120×60×50 mm (with ventilation on the lid)
Enclosure with screw-mounted lid STL 3D file: 120×60×50 mm (with ventilation on the lid)
View of object #0
Enclosure model with screwed lid in 3D STL format. The dimensions are 120 mm long by 60 mm wide and 50 mm high. The cover only is 15 mm high. Wall thickness is 3 mm. This enclosure has cooling area on the lid.
Parameter Value Unit
length 120 mm
width 60 mm
total height 50 mm
lid height 15 mm
wall thickness 3 mm
screw margin 0.2 mm
fit clearance 0.1 mm
cooling level 4
cooling zone(s) cutouts on t...

📦 Model #2041

2 object(s)
- format STL
Round box with lid STL 3D file ⌀ 104 mm - Height: 54 mm, Shell: 2 mm
Round box with lid STL 3D file ⌀ 104 mm - Height: 54 mm, Shell: 2 mm
View of object #0
Get this circular box in STL format. Its diameter is 104 mm and its height is 54 mm. The wall width is 2 mm. A fillet located at the bottom of the box makes it easier to grab stored objects inside.
Parameter Value Unit
external diameter 104 mm
total height 54 mm
wall thickness 2 mm
fit clearance 0.2 mm
inner bottom fillet 2 mm

📦 Model #2778

2 object(s)
- format STL
Small parts organizer with 6 drawers 33×11×21 mm STL 3D file, thickness: 3 mm
Small parts organizer with 6 drawers 33×11×21 mm STL 3D file, thickness: 3 mm
View of object #0
Download this 3D model of a sorting cabinet with drawers in 3D STL format. This model features 6 compartments, arranged in 2 rows and 3 columns. In detail, this means 2 rows of 3 compartments. Each compartment provides an inside space of 33 mm wide, 11 mm high, and 21 mm deep. The wall thickness is 3 mm, which makes the structure solid. The external dimensions of the box come to 130.5 x 38 x 30 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 3
inner drawer depth 21 mm
inner drawer width 33 mm
inner drawer height 11 mm
wall thickness 3 mm
removable divider none

📦 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 #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...

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.