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

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

Protective grid STL file, center-to-center: 105x105mm, mesh: 4mm - Ø4mm

Pot STL file, inner: base Ø40 mm, top Ø40 mm, height 40 mm - wall thickness 2 mm

Multi-compartment box STL file: 48 compartments of 20×20×20 mm

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

Round-to-Rectangular Tube Adapter STL file ⌀100 mm to 50×50 mm, thickness 2 mm

Mounting bracket 120×120 mm STL file, thickness 8 mm, hole diameter 5 mm

Box STL 3D file with dimensions 50×50×60 mm

Clip-on tube holder Ø32 mm STL file · Flat head screw Ø4 mm

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

Browse a growing library of free STL files and 3D models for 3D printers, or generate custom parts online with your exact dimensions.

Featured Model

U-shaped handle STL 3D file 50×100×14 mm (Center-to-center 86 mm) 📦 #933

1 object(s) - format STL

View of object #0

Latest user-generated 3D models:

Enclosure with screw-mounted lid STL 3D file: 160×160×90 mm (with ventilation on the lid and under the enclosure) 📦 #4402

2 object(s) - format STL

View of object #0

From the blog

Modify 3D geometry in the slicer

2025-11-14 · 3D Modeling · sylvain

Editing 3D geometry without CAD software is absolutely possible!

In this article, you’ll learn how to tweak your models directly in your slicer. It’s the perfect approach when the generated model is almost right but still needs a small adjustment.

You’ll see how to rescale a part, work axis by axis, and even compensate for a missing step size in the template, with concrete examples like the honeycomb grid and snap-on pipe clip holders.

We’ll also look at the slicer’s advanced editing tools: adding volumes, subtracting geometry, embossed or debossed text, and custom holes — all simple operations that let you adapt an existing STL with zero CAD skills.

A practical, quick, and handy guide to personalize your prints in just a few clicks!

Read the article

A selection of custom 3D models

📦 Model #3898

1 object(s)

- format STL

Tubing elbow STL 3D file 65° ⌀OD: 10 mm ⌀ID: 8 mm thickness: 1 mm

Model of a tubing elbow with a 65° angle in STL format. This elbow has an external diameter of 10 mm and an internal diameter of 8 mm. This results in a tube thickness of 1 mm.

Parameter	Value	Unit
outer diameter	10	mm
inner diameter	8	mm
angle	65	°
end fillets	no

📦 Model #3930

1 object(s)

- format STL

Multi-compartment box STL 3D file: 64 compartments of 14×14×40 mm

This STL 3D model provides 64 slots measuring 14×14×40mm each. The total dimensions of the box are 130×130×42mm. Fillets of 3mm applied to all compartments help with item retrieval stored in slots.

Parameter	Value	Unit
number of rows	8
number of columns	8
compartment length	14	mm
compartment width	14	mm
compartment height	40	mm
wall thickness	2	mm
compartment fillet (radius)	3	mm

📦 Model #1333

1 object(s)

- format STL

Round air vent STL file ∅ 120 mm, slat angle: 45° with central reinforcement

3D file of a round vent cover for air circulation in STL format. Its male diameter measures 120 mm. The slats have an angle of 45° and a low thickness of 1.6 mm. A vertical reinforcement strengthens the slats. This 3D vent cover has a thin flange of 5 mm. The overall diameter of the model is 130 mm.

Parameter	Value	Unit
male diameter	120	mm
slat angle	45	°
slat thickness	1.6	mm
flange width	5	mm
central reinforcement	yes

📦 Model #968

1 object(s)

- format STL

U-shaped handle STL file 50×140×10 mm (Center-to-center 130 mm)

Download this STL 3D model of a U-shaped handle. The overall dimensions are 50×140×10 mm. The handle has a square cross-section and a smooth transition. A fillet produces improved handling. The holes are 5 mm diameter with a center-to-center distance of 130 mm.

Parameter	Value	Unit
width	50	mm
length	140	mm
thickness	10	mm
shape (0:square,1:circle)	0
transition (0:right,1:rounded)	1
fillet radius	1	mm
hole diameter	5	mm

📦 Model #1861

1 object(s)

- format STL

Round-to-Rectangular Tube Adapter STL 3D file ⌀31 mm to 70×90 mm, thickness 2 mm

Download this 3D model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀31 mm and a rectangular section with inner dimensions 70×90 mm. The wall thickness is 2 mm and the overall length is 200 mm. Chamfers are present on the outside of the cylindrical end and on the inside of the rectangular end.

Parameter	Value	Unit
cylinder outer diameter	31	mm
cylinder inlet length	50	mm
rectangle internal length	70	mm
rectangle internal height	90	mm
rectangle inlet length	100	mm
offset Z	0	mm
offset Y	0	mm
total length	200	mm
thickness	2	mm
chamfer	chamfers on ...

📦 Model #3657

1 object(s)

- format STL

Washer / Flat Gasket STL 3D file ⌀ID: 4 mm ⌀OD: 25 mm thickness: 2.8 mm + chamfer

File of flat gasket / washer in STL format. This model features an inner diameter of ⌀4 mm and an outer diameter of ⌀25 mm. The part thickness is 2.8 mm. A chamfer is applied on the outer diameter with a value of 1.2 mm.

Parameter	Value	Unit
inner diameter	4	mm
outer diameter	25	mm
thickness	2.8	mm
finish	chamfer
finish position	outer
sides	one side
finish value	1.2	mm

📦 Model #3735

1 object(s)

- format STL

Honeycomb grille STL file, center-to-center: 100x70mm, mesh: 6mm - Ø3mm

Download this rectangular protective grid model in STL format. Mounting holes are placed at the four corners (center-to-center 100x70 mm), each with a diameter of Ø3 mm. The overall dimensions reach 106x76 mm, with open 6 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	100	mm
width or center-to-center	70	mm
mesh size	6	mm
dual color	no
holes	yes
hole diameter	3	mm

📦 Model #3636

1 object(s)

- format STL

Multi-compartment box STL 3D file: 60 compartments of 35×35×50 mm

This multi-compartment box design includes 60 sections measuring 35×35×50mm each. The total dimensions of the box are 550×235×60mm. A 5mm fillet applied to all compartments make it easier to grasp items stored in the compartments. The walls are particularly robust.

Parameter	Value	Unit
number of rows	5
number of columns	12
compartment length	35	mm
compartment width	35	mm
compartment height	50	mm
wall thickness	10	mm
compartment fillet (radius)	5	mm

📦 Model #3649

1 object(s)

- format STL

Multi-compartment box STL file: 15 compartments of 56×36×40 mm

This STL file includes 15 sections measuring 56×36×40mm each. The total dimensions are 292×116×42mm.

Parameter	Value	Unit
number of rows	3
number of columns	5
compartment length	56	mm
compartment width	36	mm
compartment height	40	mm
wall thickness	2	mm
compartment fillet (radius)	1	mm

📦 Model #1096

1 object(s)

- format STL

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 #839

1 object(s)

- format STL

U-shaped handle STL 3D file 35×100×20 mm (Center-to-center 80 mm)

Download this STL 3D model of a simple U-shaped handle. The overall dimensions are 35×100×20 mm. The handle has a square section and a smooth transition. The holes are 5 mm diameter with a center-to-center distance of 80 mm.

Parameter	Value	Unit
width	35	mm
length	100	mm
thickness	20	mm
shape (0:square,1:circle)	0
transition (0:right,1:rounded)	1
fillet radius	0	mm
hole diameter	5	mm

📦 Model #3691

1 object(s)

- format STL

Protective grid STL 3D file, center-to-center: 250x250mm, mesh: 10mm - Ø8mm

Download this 3D honeycomb protective square grid as a STL file. Mounting holes are placed at the four corners (center-to-center 250x250 mm), each with a diameter of Ø8 mm. The overall dimensions reach 266x266 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	250	mm
width or center-to-center	250	mm
mesh size	10	mm
dual color	no
holes	yes
hole diameter	8	mm

📦 Model #2055

1 object(s)

- format STL

Round-to-Rectangular Tube Adapter STL file ⌀101.6 mm to 254×101.6 mm, thickness 5 mm

3D model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀101.6 mm and a rectangular section with internal dimensions 254×101.6 mm. The wall thickness is 5 mm and the overall length is 177.8 mm.

Parameter	Value	Unit
cylinder outer diameter	101.6	mm
cylinder inlet length	50	mm
rectangle internal length	254	mm
rectangle internal height	101.6	mm
rectangle inlet length	76	mm
offset Z	0	mm
offset Y	0	mm
total length	177.8	mm
thickness	5	mm
chamfer	no chamfer

📦 Model #3478

1 object(s)

- format STL

Clip-on tube support Ø21 mm STL file · Countersunk screw Ø3 mm

Download this 3D file of a Ø21 mm custom pipe holder in STL format. The fastening is done by means of a countersunk screw Ø3 mm. This clip-on tube holder is built for a secure hold and simple mounting.

Parameter	Value	Unit
tube diameter	21	mm
hole diameter	3	mm
countersunk screw	yes

📦 Model #4223

1 object(s)

- format STL

Washer / Flat Gasket STL file ⌀ID: 150 mm ⌀OD: 155 mm thickness: 0.1 mm

Download this file of gasket / washer in STL format. This model has an internal diameter of ⌀150 mm and an external diameter of ⌀155 mm. The part thickness is 0.1 mm. There is no finish present.

Parameter	Value	Unit
inner diameter	150	mm
outer diameter	155	mm
thickness	0.1	mm
finish	none

📦 Model #2211

3 object(s)

- format STL

Small parts organizer with 18 drawers 30×30×90 mm STL 3D file, thickness: 4 mm

Download this model of a drawer organizer in 3D STL format. This model features 18 boxes, arranged in 6 rows and 3 columns. Specifically, this means 6 rows of 3 boxes. Each box offers a storage volume of 30 mm wide, 30 mm high, and 90 mm deep. The wall thickness is 4 mm, which makes the structure very solid. The boxes feature 2 dividers each, which allows up to 3 compartments per box and up to 54 sections in total. The total size of the structure come to 131.5 x 235 x 102 mm. All the objects in this model were designed to be printable without support generation.

Parameter	Value	Unit
number of rows	6
number of columns	3
inner drawer depth	90	mm
inner drawer width	30	mm
inner drawer height	30	mm
wall thickness	4	mm
removable divider	two divider ...

📦 Model #2669

1 object(s)

- format STL

Corner bracket 250×250 mm STL 3D file, thickness 8 mm, hole diameter 5 mm

File of a corner bracket with a central reinforcing bar in STL 3D format. The dimensions are 250 mm in length, 250 mm in height, 30 mm in width, and 8 mm in thickness. The screw holes are designed with a diameter of 5 mm. Chamfers are done to the holes to seat the screw heads. The central reinforcement bar enhances mechanical strength and includes two clearances for fastening. Support generation is not required for printing this bracket, printed flat on the build plate.

Parameter	Value	Unit
length	250	mm
height	250	mm
width	30	mm
thickness	8	mm
hole diameter	5	mm
chamfer on the holes	yes

📦 Model #4136

2 object(s)

- format STL

Small parts organizer with 4 drawers 110×80×150 mm STL 3D file, thickness: 3 mm

Model of a drawer organizer in STL format. This model contains 4 boxes, arranged in 2 rows and 2 columns. In detail, this means 2 rows of 2 boxes. Each box measures 110 mm wide, 80 mm high, and 150 mm deep. The wall thickness is 3 mm, which makes the structure solid. The overall dimensions of the box come to 242 x 176 x 159 mm. All the objects in this model were designed to be printed without support generation.

Parameter	Value	Unit
number of rows	2
number of columns	2
inner drawer depth	150	mm
inner drawer width	110	mm
inner drawer height	80	mm
wall thickness	3	mm
removable divider	none

📦 Model #3589

1 object(s)

- format STL

Honeycomb grid STL 3D file, 160x34mm, mesh: 7mm

Download this rectangular protective honeycomb grid file in STL format. The overall size is 160x34 mm, with large 7 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	160	mm
width or center-to-center	34	mm
mesh size	7	mm
dual color	no
holes	no

📦 Model #4031

2 object(s)

- format STL

Small parts organizer with 5 drawers 40×25×50 mm STL file, thickness: 2 mm

Download this 3D model of storage drawers in 3D STL format. This model features 5 boxes, arranged in 5 rows and 1 columns. In detail, this means 5 rows of 1 boxes. Each box provides an inside space of 40 mm wide, 25 mm high, and 50 mm deep. The wall thickness is 2 mm. The total size of the structure measure 48.5 x 149.5 x 56 mm. All the objects in this model were designed to be printed without support.

Parameter	Value	Unit
number of rows	5
number of columns	1
inner drawer depth	50	mm
inner drawer width	40	mm
inner drawer height	25	mm
wall thickness	2	mm
removable divider	none

📦 Model #802

1 object(s)

- format STL

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

Download this STL 3D file of a simple U-shaped handle. The overall dimensions are 35×100×10 mm. The handle has a square section combined with a rounded transition. The mounting holes are 4 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	4	mm

📦 Model #4089

1 object(s)

- format STL

Honeycomb grid STL 3D file, 100x70mm, mesh: 3mm

3D rectangular grid model in STL format. The overall size is 100x70 mm, with very fine 3 mm cell size for maximum protection. This type of grid provides mechanical protection and ventilation.

Parameter	Value	Unit
length or center-to-center	100	mm
width or center-to-center	70	mm
mesh size	3	mm
dual color	no
holes	no

📦 Model #1740

1 object(s)

- format STL

Pipe elbow STL 3D file 10° ⌀OD: 40 mm ⌀ID: 34.8 mm thickness: 2.6 mm

3D file of a pipe elbow with a 10° angle in STL format. This elbow features an external diameter of 40 mm and an internal diameter of 34.8 mm. This results in a tube thickness of 2.6 mm.

Parameter	Value	Unit
outer diameter	40	mm
inner diameter	34.8	mm
angle	10	°
end fillets	no

📦 Model #890

1 object(s)

- format STL

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

Download this STL 3D model of a U-shaped drawer handle. The external dimensions are 35×140×20 mm. This handle features a square cross-section combined with a straight transition. A fillet along the edges produces a softer grip. 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)	0
fillet radius	1	mm
hole diameter	5	mm

📦 Model #1886

1 object(s)

- format STL

Round-to-Rectangular Tube Adapter STL file ⌀81 mm to 106×50 mm, thickness 3 mm + offset

Download this 3D model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀81 mm and a rectangular section with internal dimensions 106×50 mm. The shell thickness is 3 mm and the overall length is 100 mm. The adapter has an offset of 25 mm along the Y axis and 25 mm along the Z axis. Chamfers are applied on the outside of the cylindrical end and on the inside of the rectangular end to ease insertion.

Parameter	Value	Unit
cylinder outer diameter	81	mm
cylinder inlet length	20	mm
rectangle internal length	106	mm
rectangle internal height	50	mm
rectangle inlet length	30	mm
offset Z	25	mm
offset Y	25	mm
total length	100	mm
thickness	3	mm
chamfer	chamfers on ...

📦 Model #826

1 object(s)

- format STL

U-shaped handle STL 3D file 35×100×14 mm (Center-to-center 86 mm)

Download this STL 3D file of a basic U-shaped handle. The external dimensions are 35×100×14 mm. This handle features a circular section and a straight transition. The bores are 4 mm diameter and have a 86 mm center-to-center distance.

Parameter	Value	Unit
width	35	mm
length	100	mm
thickness	14	mm
shape (0:square,1:circle)	1
transition (0:right,1:rounded)	0
fillet radius	0	mm
hole diameter	4	mm

📦 Model #4162

1 object(s)

- format STL

Round air vent STL 3D file ∅ 150 mm, slat angle: 15° with central reinforcement

3D model of a round air vent for ventilation in STL format. Its insertion diameter is 150 mm. The slats have a slight angle of 15° and a low thickness of 1.5 mm. A centered vertical reinforcement strengthens the whole structure. This vent cover features a prominent flange of 20 mm. The overall diameter of this model is 190 mm.

Parameter	Value	Unit
male diameter	150	mm
slat angle	15	°
slat thickness	1.5	mm
flange width	20	mm
central reinforcement	yes

📦 Model #3897

2 object(s)

- format STL

Enclosure with screw-mounted lid STL file: 80×40×30 mm (with ventilation on the lid)

Download this enclosure with screwed lid in 3D STL format. The dimensions are 80 mm long by 40 mm wide and 30 mm high. The cover measures 10 mm high. Side thickness is 2 mm. This enclosure has marked cooling area on the lid.

Parameter	Value	Unit
length	80	mm
width	40	mm
total height	30	mm
lid height	10	mm
wall thickness	2	mm
screw margin	0	mm
fit clearance	0.1	mm
cooling level	8
cooling zone(s)	cutouts on t...

📦 Model #2984

1 object(s)

- format STL

Tubing adapter STL file ⌀ 58–49 mm (Length: 100 mm)

Tubing reducer ⌀58 mm to ⌀49 mm in STL format. Length of this junction is 100 mm. The larger-diameter tube has a thickness of 4 mm and a sleeve length of 45 mm. The smaller-diameter tube has a thickness of 3 mm and a length of 40 mm. The ends are not rounded.

Parameter	Value	Unit
side A length	45	mm
side A outer diameter	58	mm
side A thickness	4	mm
side B length	40	mm
side B outer diameter	49	mm
side B thickness	3	mm
transition length	15	mm
axis offset	0	mm
ends fillet	no fillet

📦 Model #4111

1 object(s)

- format STL

Round-to-Rectangular Tube Adapter STL file ⌀120 mm to 60×60 mm, thickness 2 mm

File in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀120 mm and a rectangular section with inner dimensions 60×60 mm. The shell thickness is 2 mm and the overall length is 60 mm.

Parameter	Value	Unit
cylinder outer diameter	120	mm
cylinder inlet length	30	mm
rectangle internal length	60	mm
rectangle internal height	60	mm
rectangle inlet length	10	mm
offset Z	0	mm
offset Y	0	mm
total length	60	mm
thickness	2	mm
chamfer	no chamfer

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.