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Multi-compartment box STL 3D file: 6 compartments of 80×20×20 mm

Small parts organizer with 6 drawers 20×15×30 mm STL file, thickness: 2 mm

Honeycomb grille STL 3D file, center-to-center: 110x110mm, mesh: 4mm - Ø8mm

Hose-shaped reducer STL 3D file 90.1x90 mm to 100x40 mm – transition: 100 mm

Pot STL 3D file, inner: base Ø50 mm, top Ø80 mm, height 70 mm - wall thickness 2 mm

Round box with lid STL 3D file ⌀ 45 mm - Height: 100 mm, Shell: 2 mm

Round box with lid STL 3D file ⌀ 80 mm - Height: 50 mm, Shell: 3 mm

Round box with lid STL 3D file ⌀ 100 mm - Height: 20 mm, Shell: 3 mm

Small parts organizer with 6 drawers 40×15×30 mm STL 3D file, thickness: 2 mm

Storage cube with lid STL file – 50×50×50 mm, wall thickness 2 mm

Browse a growing library of free STL files and 3D models — or generate custom parts online to your exact specs.

Featured Model of the Day

Rectangular-base box with lid STL 3D model – 170×95×110 mm, wall thickness 3 mm 📦 #6422

2 object(s) - format STL

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Latest user-generated 3D models

Rectangular-base box with lid STL file – 100×50×90 mm, wall thickness 3 mm 📦 #10682

2 object(s) - format STL

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From the Blog

Why Modeling Strategy Matters in Procedural CAD Modeling

2025-12-14 · 3D Modeling · sylvain

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 #2539

3 object(s)

- format STL

Small parts organizer with 4 drawers 150×20×60 mm STL file, thickness: 2 mm

Download this model of a storage case in 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, 20 mm high, and 60 mm deep. The wall thickness is 2 mm. The drawers feature 1 divider each, which allows up to 2 sections per drawer and up to 8 sections in total. The global dimensions of the structure are 158.5 x 100 x 66 mm. All the objects in this model were designed to be printable without support.

Parameter	Value	Unit
number of rows	4
number of columns	1
inner drawer depth	60	mm
inner drawer width	150	mm
inner drawer height	20	mm
wall thickness	2	mm
removable divider	one divider ...

📦 Model #2791

1 object(s)

- format STL

Tubing adapter STL 3D file ⌀ 64–32 mm (Length: 80 mm)

Inline tubing adapter ⌀64 mm to ⌀32 mm in STL 3D format. Total length of this reducer 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 a fillet on the inside to ease the connection.

Parameter	Value	Unit
side A length	30	mm
side A outer diameter	64	mm
side A thickness	3	mm
side B length	30	mm
side B outer diameter	32	mm
side B thickness	3	mm
transition length	20	mm
axis offset	0	mm
ends fillet	fillet on th...

📦 Model #3491

1 object(s)

- format STL

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 #3059

1 object(s)

- format STL

Tubing adapter STL file ⌀ 100–56 mm (Length: 75 mm)

Tube adapter ⌀100 mm to ⌀56 mm in STL format. Length of this junction is 75 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a length of 25 mm, the smaller one of 25 mm as well. 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	100	mm
side A thickness	3	mm
side B length	25	mm
side B outer diameter	56	mm
side B thickness	3	mm
transition length	25	mm
axis offset	20	mm
ends fillet	no fillet

📦 Model #3612

1 object(s)

- format STL

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 #2313

1 object(s)

- format STL

Tube adapter STL file ⌀ 77–57 mm (Length: 125 mm)

Inline tube junction ⌀77 mm to ⌀57 mm in STL format. Length of this fitting is 125 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 50 mm, the smaller one of 50 mm as well. The ends have no fillet.

Parameter	Value	Unit
side A length	50	mm
side A outer diameter	77	mm
side A thickness	2	mm
side B length	50	mm
side B outer diameter	57	mm
side B thickness	2	mm
transition length	25	mm
axis offset	0	mm
ends fillet	no fillet

📦 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

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 #804

1 object(s)

- format STL

U-shaped handle STL file 35×100×10 mm (Center-to-center 90 mm)

Download this STL file of a U-shaped handle. The external dimensions are 35×100×10 mm. The handle features a square section and a rounded transition. The holes are 6 mm diameter and have a 90 mm center-to-center distance.

Parameter	Value	Unit
width	35	mm
length	100	mm
thickness	10	mm
shape (0:square,1:circle)	0
transition (0:right,1:rounded)	1
fillet radius	0	mm
hole diameter	6	mm

📦 Model #3151

1 object(s)

- format STL

Multi-compartment box STL 3D file: 6 compartments of 7.6×7.6×29 mm

This STL file includes 6 compartments measuring 7.6×7.6×29mm each. The total dimensions are 24.5×35.2×32.1mm. A 3mm fillet applied to each compartment make it easier to grasp items stored in the compartments. The walls are particularly thick.

Parameter	Value	Unit
number of rows	3
number of columns	2
compartment length	7.6	mm
compartment width	7.6	mm
compartment height	29	mm
wall thickness	3.1	mm
compartment fillet (radius)	3	mm

📦 Model #4192

1 object(s)

- format STL

Tube elbow STL file 90° ⌀OD: 42 mm ⌀ID: 41 mm thickness: 0.5 mm

File of an elbow with a 90° angle in STL format. This elbow has an external diameter of 42 mm and an internal diameter of 41 mm. This results in a tube thickness of 0.5 mm.

Parameter	Value	Unit
outer diameter	42	mm
inner diameter	41	mm
angle	90	°
end fillets	no

📦 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 #3057

1 object(s)

- format STL

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 #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 #1251

2 object(s)

- format STL

Round box with lid STL file ⌀ 100 mm - Height: 150 mm, Shell: 3 mm

Get this cylindrical storage box in STL format. Its diameter is 100 mm and its total height is 150 mm. The walls have a thickness of 3 mm. A fillet located at the bottom of the box makes it easier to grip stored objects inside.

Parameter	Value	Unit
external diameter	100	mm
total height	150	mm
wall thickness	3	mm
fit clearance	0.1	mm
inner bottom fillet	1	mm

📦 Model #865

1 object(s)

- format STL

U-shaped handle STL file 35×140×10 mm (Center-to-center 130 mm)

Download this STL 3D file of a U-shaped handle. The overall dimensions are 35×140×10 mm. The handle features a circular cross-section and a rounded transition. The bores are 4 mm diameter and have a 130 mm center-to-center distance.

Parameter	Value	Unit
width	35	mm
length	140	mm
thickness	10	mm
shape (0:square,1:circle)	1
transition (0:right,1:rounded)	1
fillet radius	0	mm
hole diameter	4	mm

📦 Model #3970

1 object(s)

- format STL

Rectangle-to-rectangle duct adapter STL file 60x60 mm to 80x80 mm – transition: 180 mm

Rectangular duct connector downloadable as STL 3D file. Side A offers an internal cross-section of 60x60 mm (square) and side B uses 80x80 mm (square). The sleeve insertion length is the same on both sides, 10 mm. The transition section runs for 180 mm and the overall length is 200 mm, sleeves included. The wall is thin, with a thickness of 1 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier. Side B is offset by 90 mm along the Y axis relative to side A.

Parameter	Value	Unit
side A internal width	60	mm
side A internal height	60	mm
sleeve length on side A	10	mm
side B internal width	80	mm
side B internal height	80	mm
sleeve length on side B	10	mm
thickness	1	mm
transition length	180	mm
Y offset	90	mm
Z offset	0	mm
end chamfers	inside

📦 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 #4201

1 object(s)

- format STL

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 #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 #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

📦 Model #783

1 object(s)

- format STL

Plate STL file 100×10×90 mm

Download a rectangular prism as a 3D STL file. The shape might resemble a thin sheet. Its final dimensions are 100×10×90 mm. A fillet smooths the sides.

Parameter	Value	Unit
length	100	mm
width	10	mm
height	90	mm
fillet radius	1	mm

📦 Model #1955

1 object(s)

- format STL

Round air vent STL file ∅ 100 mm, slat angle: 45° with central reinforcement

Design of a round air vent for air circulation in STL format. Its insertion diameter measures 100 mm. The slats have an angle of 45° and a high thickness of 2 mm. A vertical reinforcement secures the whole structure. This vent cover has a collar of 10 mm. The overall diameter of this model is 120 mm.

Parameter	Value	Unit
male diameter	100	mm
slat angle	45	°
slat thickness	2	mm
flange width	10	mm
central reinforcement	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 #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 #3724

1 object(s)

- format STL

Protective grid STL 3D file, center-to-center: 300x106mm, mesh: 10mm - Ø6mm

Download this 3D honeycomb protective rectangular grid model in STL format. Mounting holes are placed at the four corners (center-to-center 300x106 mm), each with a diameter of Ø6 mm. The overall dimensions reach 312x118 mm, with very large 10 mm cell size for maximum airflow. This grid functions as both a mechanical guard and a ventilation panel.

Parameter	Value	Unit
length or center-to-center	300	mm
width or center-to-center	106	mm
mesh size	10	mm
dual color	no
holes	yes
hole diameter	6	mm

📦 Model #4145

1 object(s)

- format STL

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 #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 #4414

2 object(s)

- format STL

Round box with lid STL 3D file ⌀ 134 mm - Height: 20 mm, Shell: 2 mm

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 #2969

1 object(s)

- format STL

Honeycomb grid STL 3D file, center-to-center: 300x177mm, mesh: 6mm - Ø4mm

Download this rectangular grid model in STL format. Mounting holes are placed at the four corners (center-to-center 300x177 mm), each with a diameter of Ø4 mm. The overall dimensions reach 308x185 mm, with large 6 mm cell size to enhance ventilation. This type of grid serves both protection and ventilation roles.

Parameter	Value	Unit
length or center-to-center	300	mm
width or center-to-center	177	mm
mesh size	6	mm
dual color	no
holes	yes
hole diameter	4	mm

📦 Model #1983

1 object(s)

- format STL

Round-to-Rectangular Tube Adapter STL file ⌀75 mm to 150×30 mm, thickness 3 mm + offset

Download this file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀75 mm and a rectangular section with inner dimensions 150×30 mm. The shell thickness is 3 mm and the total length is 150 mm. The adapter has an offset of 3 mm along the Y axis and 3 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	75	mm
cylinder inlet length	25	mm
rectangle internal length	150	mm
rectangle internal height	30	mm
rectangle inlet length	30	mm
offset Z	3	mm
offset Y	3	mm
total length	150	mm
thickness	3	mm
chamfer	chamfers on ...

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.