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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.

A selection of custom 3D models

Download this 3D file of a right-angle bracket with a central reinforcement in STL 3D format. The dimensions are 150 mm in length, 100 mm in height, 20 mm in width, and 8 mm in thickness. The mounting holes are designed with a diameter of 8 mm. Chamfers are done to the holes to improve the seating of the heads. The central reinforcement bar reduces bending and includes two openings for fastening. This bracket prints without support, placed flat on the build plate.
Parameter Value Unit
length 150 mm
height 100 mm
width 20 mm
thickness 8 mm
hole diameter 8 mm
chamfer on the holes yes
Small parts organizer with 1 drawer 97×50×98 mm STL 3D file, thickness: 2 mm
View of object #0
Model of a storage organizer in STL format. This model features 1 drawer, arranged in 1 rows and 1 columns. Practically speaking, this means 1 rows of 1 drawers. Each drawer measures 97 mm wide, 50 mm high, and 98 mm deep. The wall thickness is 2 mm. The overall dimensions of the box come to 105.5 x 56.5 x 104 mm. All the objects in this model were designed to be printable without support.
Parameter Value Unit
number of rows 1
number of columns 1
inner drawer depth 98 mm
inner drawer width 97 mm
inner drawer height 50 mm
wall thickness 2 mm
removable divider none
3D square protective honeycomb grid file in STL format. Mounting holes are placed at the four corners (center-to-center 120x120 mm), each with a diameter of Ø8 mm. The overall dimensions reach 136x136 mm, with very large 10 mm cell size for peak ventilation. This grid functions as both a mechanical guard and a ventilation panel.
Parameter Value Unit
length or center-to-center 120 mm
width or center-to-center 120 mm
mesh size 10 mm
dual color no
holes yes
hole diameter 8 mm
Download this model of an angle bracket with reinforcement in STL 3D format. The dimensions are 250 mm in length, 150 mm in height, 20 mm in width, and 5 mm in thickness. The screw holes have a diameter of 5 mm. Chamfers are applied to the holes to seat the screw heads. The reinforcing bar enhances mechanical strength and provides two passages for screwdriver access. No support is needed to print this bracket, placed flat directly on the build plate.
Parameter Value Unit
length 250 mm
height 150 mm
width 20 mm
thickness 5 mm
hole diameter 5 mm
chamfer on the holes yes

📦 Model #1239

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 110–106 mm (Length: 35 mm)
Tube adapter ⌀110 mm to ⌀106 mm in STL format. Final length of this junction is 35 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a length of 20 mm, the smaller one of 10 mm. The ends have no fillet.
Parameter Value Unit
side A length 20 mm
side A outer diameter 110 mm
side A thickness 3 mm
side B length 10 mm
side B outer diameter 106 mm
side B thickness 3 mm
transition length 5 mm
axis offset 0 mm
ends fillet no fillet
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 #4396

1 object(s)
- format STL
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 #1140

2 object(s)
- format STL
Enclosure with screw-mounted lid STL file: 100×50×40 mm
View of object #0
Download this enclosure with a screwed lid in 3D STL format. The dimensions are 100 mm long by 50 mm wide and 40 mm high. The lid measures 20 mm high. Wall thickness is 3 mm. The enclosure does not have cooling.
Parameter Value Unit
length 100 mm
width 50 mm
total height 40 mm
lid height 20 mm
wall thickness 3 mm
screw margin 0.4 mm
fit clearance 0 mm
cooling zone(s) no cutouts

📦 Model #3502

1 object(s)
- format STL
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 #1237

1 object(s)
- format STL
Tube adapter STL file ⌀ 147–75 mm (Length: 180 mm)
Tube junction ⌀147 mm to ⌀75 mm in STL format. Final length of this junction is 180 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 20 mm, the smaller one of 40 mm. The axes of the tubes are offset by 35.9 mm. The ends have no fillet.
Parameter Value Unit
side A length 20 mm
side A outer diameter 147 mm
side A thickness 2 mm
side B length 40 mm
side B outer diameter 75 mm
side B thickness 2 mm
transition length 120 mm
axis offset 35.9 mm
ends fillet no fillet
Small parts organizer with 4 drawers 150×25×120 mm STL file, thickness: 2 mm
View of object #0
3D model of a sorting cabinet with drawers in 3D STL format. This model includes 4 drawers, arranged in 4 rows and 1 columns. In detail, this means 4 rows of 1 drawers. Each drawer comes with an inner space of 150 mm wide, 25 mm high, and 120 mm deep. The wall thickness is 2 mm. The global dimensions of the box are 158.5 x 120 x 126 mm. All the objects in this model were designed to be printed without support.
Parameter Value Unit
number of rows 4
number of columns 1
inner drawer depth 120 mm
inner drawer width 150 mm
inner drawer height 25 mm
wall thickness 2 mm
removable divider none

📦 Model #4497

1 object(s)
- format STL
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 #3775

2 object(s)
- format STL
Enclosure with screw-mounted lid STL file: 50×40×30 mm
View of object #0
Download this enclosure with a screwed lid in 3D STL format. The dimensions are 50 mm long by 40 mm wide and 30 mm high. The lid only is 10 mm high. Side thickness is 5 mm. The enclosure does not feature cooling.
Parameter Value Unit
length 50 mm
width 40 mm
total height 30 mm
lid height 10 mm
wall thickness 5 mm
screw margin 0 mm
fit clearance 0.1 mm
cooling zone(s) no cutouts

📦 Model #2390

1 object(s)
- format STL
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 #755

1 object(s)
- format STL
Rectangular prism STL 3D file 100×70×29 mm
Download a rectangular prism as a 3D STL file. Its final dimensions are 100×70×29 mm. No fillet is present on the model.
Parameter Value Unit
length 100 mm
width 70 mm
height 29 mm
fillet radius 0 mm
Download this STL 3D model of a simple U-shaped handle. The external dimensions are 35×100×14 mm. This handle has a square cross-section and a straight transition. The mounting holes are 5 mm diameter with a center-to-center distance of 86 mm.
Parameter Value Unit
width 35 mm
length 100 mm
thickness 14 mm
shape (0:square,1:circle) 0
transition (0:right,1:rounded) 0
fillet radius 0 mm
hole diameter 5 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
Small parts organizer with 50 drawers 65×30×100 mm STL 3D file, thickness: 3 mm
View of object #0
Download this model of a multi-drawer unit in 3D STL format. This model features 50 drawers, arranged in 5 rows and 10 columns. In detail, this means 5 rows of 10 drawers. Each drawer measures 65 mm wide, 30 mm high, and 100 mm deep. The wall thickness is 3 mm, which makes the structure solid. The global dimensions of the structure come to 748 x 185.5 x 109 mm. All the objects in this model are intended to be printed without support generation.
Parameter Value Unit
number of rows 5
number of columns 10
inner drawer depth 100 mm
inner drawer width 65 mm
inner drawer height 30 mm
wall thickness 3 mm
removable divider none
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
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 in STL format of a round-to-rectangular adapter with an outer diameter of ⌀110 mm and a rectangular section with internal dimensions 150×80 mm. The wall thickness is 3 mm and the overall length is 120 mm. The adapter has an offset of 30 mm along the Z axis.
Parameter Value Unit
cylinder outer diameter 110 mm
cylinder inlet length 30 mm
rectangle internal length 150 mm
rectangle internal height 80 mm
rectangle inlet length 30 mm
offset Z 30 mm
offset Y 0 mm
total length 120 mm
thickness 3 mm
chamfer no chamfer

📦 Model #4184

1 object(s)
- format STL
Tubing adapter STL file ⌀ 78–65 mm (Length: 70 mm)
Diameter adapter ⌀78 mm to ⌀65 mm in STL 3D format. Length of this reducer is 70 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a length of 30 mm, the smaller one of 20 mm. The ends are rounded to facilitate the connection of the two tubes.
Parameter Value Unit
side A length 30 mm
side A outer diameter 78 mm
side A thickness 2 mm
side B length 20 mm
side B outer diameter 65 mm
side B thickness 2 mm
transition length 20 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 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 #4475

1 object(s)
- format STL
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 #4447

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 100–79 mm (Length: 240 mm)
Straight tube fitting ⌀100 mm to ⌀79 mm in STL 3D format. Total length of this sleeve is 240 mm. The larger-diameter tube has a thickness of 4 mm and a sleeve length of 100 mm. The smaller-diameter tube has a thickness of 5 mm and a length of 100 mm as well. The axes of the tubes are offset by 11.4 mm. The ends feature an external fillet.
Parameter Value Unit
side A length 100 mm
side A outer diameter 100 mm
side A thickness 4 mm
side B length 100 mm
side B outer diameter 79 mm
side B thickness 5 mm
transition length 40 mm
axis offset 11.4 mm
ends fillet fillet on th...
3D model of flat gasket / washer in STL file format. This part has an inner diameter of ⌀60 mm and an outer diameter of ⌀80 mm. The part thickness is 10 mm. Fillets are present on both the inner diameter and the outer diameter, each with a value of 4.9 mm. These finishes are applied on the top and bottom.
Parameter Value Unit
inner diameter 60 mm
outer diameter 80 mm
thickness 10 mm
finish fillet
finish position inner + oute...
sides two sides
finish value 4.9 mm
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
Download this file of a right-angle bracket with a central reinforcement in STL format. The dimensions are 200 mm in length, 150 mm in height, 40 mm in width, and 10 mm in thickness. The screw holes are designed with a diameter of 6 mm. Chamfers are applied to the holes to seat the screw heads. The reinforcing bar improves rigidity and provides two clearances for screwdriver access. Support generation is not required for printing this bracket, lying flat directly on the build plate.
Parameter Value Unit
length 200 mm
height 150 mm
width 40 mm
thickness 10 mm
hole diameter 6 mm
chamfer on the holes yes

📦 Model #4476

1 object(s)
- format STL
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 #4503

1 object(s)
- format STL
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

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.