Free custom STL files and 3D models for 3D printers

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Small parts organizer with 4 drawers 100×10×50 mm STL 3D file, thickness: 2 mm

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

Tube adapter STL file ⌀ 16–12 mm (Length: 35 mm)

Tube adapter STL 3D file ⌀ 80–50 mm (Length: 80 mm)

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

Tube support clip Ø200 mm STL file · Round head screw Ø8 mm

Round box with lid STL file ⌀ 45 mm - Height: 40 mm, Shell: 2 mm

Tube adapter STL file ⌀ 60–30 mm (Length: 140 mm)

Enclosure with screw-mounted lid STL 3D file: 80×50×35 mm (with ventilation on the lid)

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

Round box with lid STL file ⌀ 96 mm - Height: 170 mm, Shell: 3 mm 📦 #1484

2 object(s) - format STL

Latest user-generated 3D models

Round-to-Rectangular Tube Adapter STL 3D file ⌀177 mm to 255×89 mm, thickness 4 mm + offset 📦 #10381

1 object(s) - format STL

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 #2220

1 object(s)

- format STL

Tube adapter STL file ⌀ 200–140 mm (Length: 180 mm)

Tube connector ⌀200 mm to ⌀140 mm in STL format. Final length of this coupler is 180 mm. The thickness of the tubes is identical: 7 mm. The larger-diameter tube has a sleeve length of 60 mm, the smaller one of 60 mm as well. The ends are raw.

Parameter	Value	Unit
side A length	60	mm
side A outer diameter	200	mm
side A thickness	7	mm
side B length	60	mm
side B outer diameter	140	mm
side B thickness	7	mm
transition length	60	mm
axis offset	0	mm
ends fillet	no fillet

📦 Model #4421

1 object(s)

- format STL

Protective grid STL file, 300x270mm, mesh: 10mm

3D rectangular protective honeycomb grid model as a STL file. The overall size is 300x270 mm, with extra wide 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	300	mm
width or center-to-center	270	mm
mesh size	10	mm
dual color	no
holes	no

📦 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 #1570

2 object(s)

- format STL

Enclosure with screw-mounted lid STL file: 80×50×30 mm (with ventilation on the lid and under the enclosure)

Enclosure with screwed lid in 3D STL format. The dimensions are 80 mm long by 50 mm wide and 30 mm high. The cover only is 10 mm high. Wall thickness is 2 mm. This enclosure features cooling area on the lid and under the base.

Parameter	Value	Unit
length	80	mm
width	50	mm
total height	30	mm
lid height	10	mm
wall thickness	2	mm
screw margin	0	mm
fit clearance	0.2	mm
cooling level	3
cooling zone(s)	cutouts on b...

📦 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 #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 #896

1 object(s)

- format STL

U-shaped handle STL 3D file 35×140×20 mm (Center-to-center 120 mm)

Download this STL file of a simple U-shaped handle. The external dimensions are 35×140×20 mm. This handle features a square profile combined with a smooth transition. A fillet allows for improved handling. The openings are 5 mm diameter with a center-to-center distance of 120 mm.

Parameter	Value	Unit
width	35	mm
length	140	mm
thickness	20	mm
shape (0:square,1:circle)	0
transition (0:right,1:rounded)	1
fillet radius	1	mm
hole diameter	5	mm

📦 Model #1819

1 object(s)

- format STL

Washer / Flat Gasket STL 3D file ⌀ID: 57 mm ⌀OD: 74 mm thickness: 5 mm + chamfers

Download this 3D model of flat gasket / washer in STL file format. This part has an inner diameter of ⌀57 mm and an outer diameter of ⌀74 mm. The total thickness is 5 mm. Chamfers are present on both the inner diameter and the outer diameter, each with a value of 3.4 mm.

Parameter	Value	Unit
inner diameter	57	mm
outer diameter	74	mm
thickness	5	mm
finish	chamfer
finish position	inner + oute...
sides	one side
finish value	3.4	mm

📦 Model #2119

1 object(s)

- format STL

Tube adapter STL file ⌀ 30–17 mm (Length: 90 mm)

Inline tube coupler ⌀30 mm to ⌀17 mm in STL format. Length of this junction is 90 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a length of 30 mm, the smaller one of 30 mm as well. The ends are rounded to make tube connection easier.

Parameter	Value	Unit
side A length	30	mm
side A outer diameter	30	mm
side A thickness	2	mm
side B length	30	mm
side B outer diameter	17	mm
side B thickness	2	mm
transition length	30	mm
axis offset	0	mm
ends fillet	fillet on bo...

📦 Model #2326

2 object(s)

- format STL

Small parts organizer with 40 drawers 80×30×150 mm STL 3D file, thickness: 2 mm

Download this 3D file of a DIY organizer in 3D STL format. This model includes 40 compartments, arranged in 5 rows and 8 columns. In detail, this means 5 rows of 8 compartments. Each compartment provides an inside space of 80 mm wide, 30 mm high, and 150 mm deep. The wall thickness is 2 mm. The total size of the box come to 694 x 174.5 x 156 mm. All the objects in this model were designed to be printable without support generation.

Parameter	Value	Unit
number of rows	5
number of columns	8
inner drawer depth	150	mm
inner drawer width	80	mm
inner drawer height	30	mm
wall thickness	2	mm
removable divider	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 #1825

2 object(s)

- format STL

Enclosure with screw-mounted lid STL file: 120×120×80 mm (with ventilation on the lid and under the enclosure)

Download this enclosure model with screwed lid in STL format. The dimensions are 120 mm long by 120 mm wide and 80 mm high. The cover is 15 mm high. Wall thickness is 4 mm. This enclosure has significant cooling area on the lid and under the base.

Parameter	Value	Unit
length	120	mm
width	120	mm
total height	80	mm
lid height	15	mm
wall thickness	4	mm
screw margin	0	mm
fit clearance	0.1	mm
cooling level	10
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

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 #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 #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 #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 #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 #1515

2 object(s)

- format STL

Enclosure with screw-mounted lid STL file: 140×190×20 mm

Enclosure model with lid in 3D STL format. The dimensions are 140 mm long by 190 mm wide and 20 mm high. The cover only measures 10 mm high. Side thickness is 2 mm. The enclosure does not feature cooling.

Parameter	Value	Unit
length	140	mm
width	190	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 #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 #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 #2389

2 object(s)

- format STL

Small parts organizer with 15 drawers 50×50×100 mm STL 3D file, thickness: 4 mm

Download this model of a sorting cabinet with drawers in STL format. This model includes 15 drawers, arranged in 3 rows and 5 columns. In detail, this means 3 rows of 5 drawers. Each drawer offers a storage volume of 50 mm wide, 50 mm high, and 100 mm deep. The wall thickness is 4 mm, which makes the structure very sturdy. The external dimensions of the structure are 316.5 x 179.5 x 112 mm. All the objects in this model were designed to be printable without support.

Parameter	Value	Unit
number of rows	3
number of columns	5
inner drawer depth	100	mm
inner drawer width	50	mm
inner drawer height	50	mm
wall thickness	4	mm
removable divider	none

📦 Model #1608

1 object(s)

- format STL

Pipe elbow STL file 90° ⌀OD: 24 mm ⌀ID: 20.3 mm thickness: 1.85 mm

3D file of an elbow with a 90° angle in STL format. This elbow features an external diameter of 24 mm and an internal diameter of 20.3 mm. This results in a tube thickness of 1.85 mm. End fillets make it easier to assemble.

Parameter	Value	Unit
outer diameter	24	mm
inner diameter	20.3	mm
angle	90	°
end fillets	yes

📦 Model #2543

2 object(s)

- format STL

Enclosure with screw-mounted lid STL file: 42×40×20 mm (with ventilation on the lid and under the enclosure)

Download this enclosure with lid in 3D STL format. The dimensions are 42 mm long by 40 mm wide and 20 mm high. The lid measures 10 mm high. Side thickness is 5 mm. This enclosure has significant cooling area on the lid and under the base.

Parameter	Value	Unit
length	42	mm
width	40	mm
total height	20	mm
lid height	10	mm
wall thickness	5	mm
screw margin	0	mm
fit clearance	0.1	mm
cooling level	10
cooling zone(s)	cutouts on b...

📦 Model #1707

1 object(s)

- format STL

Round air vent STL 3D file ∅ 150 mm, slat angle: 30°

3D model of a round air vent for air circulation in STL format. Its male diameter is 150 mm. The slats have a slight angle of 30° and a low thickness of 1.6 mm. This aeration grille features a thin flange of 5 mm. The overall diameter of this model is 160 mm.

Parameter	Value	Unit
male diameter	150	mm
slat angle	30	°
slat thickness	1.6	mm
flange width	5	mm
central reinforcement	no

📦 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 #2909

1 object(s)

- format STL

Honeycomb grille STL file, center-to-center: 50x50mm, mesh: 10mm - Ø8mm

3D honeycomb square grid model in STL format. Mounting holes are placed at the four corners (center-to-center 50x50 mm), each with a diameter of Ø8 mm. The overall dimensions reach 66x66 mm, with very open 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	50	mm
width or center-to-center	50	mm
mesh size	10	mm
dual color	no
holes	yes
hole diameter	8	mm

📦 Model #3362

1 object(s)

- format STL

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 #2192

2 object(s)

- format STL

Round box with lid STL file ⌀ 105 mm - Height: 38 mm, Shell: 2 mm

Download this cylindrical box in 3D STL format. Its diameter is 105 mm and its total height is 38 mm. The walls have a thickness of 2 mm. A fillet located at the bottom of the box makes it easier to grip stored objects inside.

Parameter	Value	Unit
external diameter	105	mm
total height	38	mm
wall thickness	2	mm
fit clearance	1	mm
inner bottom fillet	2	mm

📦 Model #1120

1 object(s)

- format STL

Tube adapter STL file ⌀ 85–29 mm (Length: 180 mm)

Inline tube junction ⌀85 mm to ⌀29 mm in STL format. Length of this sleeve is 180 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 axes of the tubes are off-center by 27 mm. The ends have no fillet.

Parameter	Value	Unit
side A length	40	mm
side A outer diameter	85	mm
side A thickness	2	mm
side B length	40	mm
side B outer diameter	29	mm
side B thickness	2	mm
transition length	100	mm
axis offset	27	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

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.