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

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Featured Model

Container STL file, inner: base Ø150 mm, top Ø150 mm, height 40 mm - wall thickness 1 mm 📦 #3794

1 object(s) - format STL

gizmo

Latest model generated online:

Honeycomb grille STL 3D file, 55x30mm, mesh: 3mm 📦 #4108

1 object(s) - format STL

gizmo

From the blog

Modify 3D geometry in the slicer

2025-11-14 · 3D Modeling · sylvain
modify 3D geometry in the slicer modify 3D geometry in the slicer

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 #3778

1 object(s)
- format STL
Tubing adapter STL 3D file ⌀ 100–24 mm (Length: 105 mm)
Tubing adapter STL 3D file ⌀ 100–24 mm (Length: 105 mm)
Straight tube connector ⌀100 mm to ⌀24 mm in STL 3D format. Total length of this fitting is 105 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a length of 5 mm, the smaller one of 20 mm. The ends are raw.
Parameter Value Unit
side A length 5 mm
side A outer diameter 100 mm
side A thickness 2 mm
side B length 20 mm
side B outer diameter 24 mm
side B thickness 2 mm
transition length 80 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #3689

2 object(s)
- format STL
Honeycomb grid STL file, center-to-center: 100x100mm, mesh: 3mm - Ø4mm
Honeycomb grid STL file, center-to-center: 100x100mm, mesh: 3mm - Ø4mm
View of object #0
3D square protective grid model as a STL file. Mounting holes are placed at the four corners (center-to-center 100x100 mm), each with a diameter of Ø4 mm. The overall dimensions reach 108x108 mm, with extra fine 3 mm cell size for high protection. A secondary color outline accents the contour. This grid functions as both a mechanical guard and a ventilation panel.
Parameter Value Unit
length or center-to-center 100 mm
width or center-to-center 100 mm
mesh size 3 mm
dual color yes
holes yes
hole diameter 4 mm

📦 Model #2339

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 55–50 mm (Length: 75 mm)
Tube adapter STL 3D file ⌀ 55–50 mm (Length: 75 mm)
Straight tube coupler ⌀55 mm to ⌀50 mm in STL 3D format. Final length of this sleeve is 75 mm. The thickness of the tubes is identical: 2.5 mm. The larger-diameter tube has a length of 20 mm, the smaller one of 50 mm. The ends are raw.
Parameter Value Unit
side A length 20 mm
side A outer diameter 55 mm
side A thickness 2.5 mm
side B length 50 mm
side B outer diameter 50 mm
side B thickness 2.5 mm
transition length 5 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #3914

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 76–30 mm (Length: 170 mm)
Tube adapter STL 3D file ⌀ 76–30 mm (Length: 170 mm)
Tube coupler ⌀76 mm to ⌀30 mm in STL 3D format. Total length of this coupler is 170 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a length of 30 mm, the smaller one of 50 mm. The ends are raw.
Parameter Value Unit
side A length 30 mm
side A outer diameter 76 mm
side A thickness 3 mm
side B length 50 mm
side B outer diameter 30 mm
side B thickness 3 mm
transition length 90 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #2199

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL 3D file ⌀40 mm to 77×33 mm, thickness 3 mm
Round-to-Rectangular Tube Adapter STL 3D file ⌀40 mm to 77×33 mm, thickness 3 mm
Download this model in STL format of a round-to-rectangular adapter with an external diameter of ⌀40 mm and a rectangular section with internal dimensions 77×33 mm. The shell thickness is 3 mm and the total length is 100 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 40 mm
cylinder inlet length 40 mm
rectangle internal length 77 mm
rectangle internal height 33 mm
rectangle inlet length 40 mm
offset Z 0 mm
offset Y 0 mm
total length 100 mm
thickness 3 mm
chamfer chamfers on ...

📦 Model #3863

2 object(s)
- format STL
Enclosure with screw-mounted lid STL 3D file: 80×80×20 mm (with ventilation on the lid)
Enclosure with screw-mounted lid STL 3D file: 80×80×20 mm (with ventilation on the lid)
View of object #0
Download this enclosure model with a screwed lid in 3D STL format. The dimensions are 80 mm long by 80 mm wide and 20 mm high. The cover measures 15 mm high. Wall thickness is 4 mm. This enclosure has marked cooling area on the lid.
Parameter Value Unit
length 80 mm
width 80 mm
total height 20 mm
lid height 15 mm
wall thickness 4 mm
screw margin 0 mm
fit clearance 0.1 mm
cooling level 8
cooling zone(s) cutouts on t...

📦 Model #1886

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL file ⌀81 mm to 106×50 mm, thickness 3 mm + offset
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 #2196

1 object(s)
- format STL
Tube adapter STL file ⌀ 26–7 mm (Length: 39 mm)
Tube adapter STL file ⌀ 26–7 mm (Length: 39 mm)
Tube adapter ⌀26 mm to ⌀7 mm in STL format. Total length of this junction is 39 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 15 mm, the smaller one of 14 mm. The ends are raw.
Parameter Value Unit
side A length 15 mm
side A outer diameter 26 mm
side A thickness 2 mm
side B length 14 mm
side B outer diameter 7 mm
side B thickness 2 mm
transition length 10 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #2522

1 object(s)
- format STL
Corner bracket 210×210 mm STL file, thickness 8 mm, hole diameter 6 mm
Corner bracket 210×210 mm STL file, thickness 8 mm, hole diameter 6 mm
File of a support bracket with reinforcement in STL format. The dimensions are 210 mm in length, 210 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 passages for fastening. No support is needed to print this bracket, placed flat directly on the build plate.
Parameter Value Unit
length 210 mm
height 210 mm
width 50 mm
thickness 8 mm
hole diameter 6 mm
chamfer on the holes yes

📦 Model #3777

2 object(s)
- format STL
Small parts organizer with 12 drawers 90×75×100 mm STL 3D file, thickness: 2 mm
Small parts organizer with 12 drawers 90×75×100 mm STL 3D file, thickness: 2 mm
View of object #0
File of a DIY organizer in STL format. This model contains 12 compartments, arranged in 3 rows and 4 columns. Practically speaking, this means 3 rows of 4 compartments. Each compartment provides an inside space of 90 mm wide, 75 mm high, and 100 mm deep. The wall thickness is 2 mm. The total size of the structure come to 388 x 240.5 x 106 mm. All the objects in this model are intended to be printable without support.
Parameter Value Unit
number of rows 3
number of columns 4
inner drawer depth 100 mm
inner drawer width 90 mm
inner drawer height 75 mm
wall thickness 2 mm
removable divider none

📦 Model #3687

2 object(s)
- format STL
Enclosure with screw-mounted lid STL 3D file: 50×50×35 mm
Enclosure with screw-mounted lid STL 3D file: 50×50×35 mm
View of object #0
Enclosure model with a screwed lid in 3D STL format. The dimensions are 50 mm long by 50 mm wide and 35 mm high. The lid is 10 mm high. Wall thickness is 3 mm. The enclosure does not feature cooling.
Parameter Value Unit
length 50 mm
width 50 mm
total height 35 mm
lid height 10 mm
wall thickness 3 mm
screw margin 0 mm
fit clearance 0.1 mm
cooling zone(s) no cutouts

📦 Model #964

1 object(s)
- format STL
U-shaped handle STL 3D file 50×140×10 mm (Center-to-center 130 mm)
U-shaped handle STL 3D file 50×140×10 mm (Center-to-center 130 mm)
Download this 3D model of a U-shaped handle. The external dimensions are 50×140×10 mm. This handle has a square cross-section combined with a rounded transition. The holes are 4 mm diameter and have a 130 mm center-to-center distance.
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 0 mm
hole diameter 4 mm

📦 Model #802

1 object(s)
- format STL
U-shaped handle STL file 35×100×10 mm (Center-to-center 90 mm)
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 #3885

1 object(s)
- format STL
O-ring STL 3D file ID 158 × CS 2.5 mm
O-ring STL 3D file ID 158 × CS 2.5 mm
3D model in STL format of O-ring with dimensions Internal diameter (ID) 158 mm × thickness 2.5  mm. Outer diameter (OD, for outer diameter) is therefore 163 mm.
Parameter Value Unit
inner diameter (ID) 158 mm
cross section (CS) 2.5 mm

📦 Model #3584

1 object(s)
- format STL
Pipe elbow STL 3D file 90° ⌀OD: 27.5 mm ⌀ID: 25.5 mm thickness: 1 mm
Pipe elbow STL 3D file 90° ⌀OD: 27.5 mm ⌀ID: 25.5 mm thickness: 1 mm
Model of a tubing elbow with a 90° angle in STL format. This pipe elbow has an external diameter of 27.5 mm and an internal diameter of 25.5 mm. This results in a tube thickness of 1 mm.
Parameter Value Unit
outer diameter 27.5 mm
inner diameter 25.5 mm
angle 90 °
end fillets no

📦 Model #3818

1 object(s)
- format STL
Multi-compartment box STL file: 5 compartments of 96×15×3 mm
Multi-compartment box STL file: 5 compartments of 96×15×3 mm
This STL file features 5 compartments measuring 96×15×3mm each. The total dimensions are 100×87×5mm. The slots are not equipped with any fillet.
Parameter Value Unit
number of rows 5
number of columns 1
compartment length 96 mm
compartment width 15 mm
compartment height 3 mm
wall thickness 2 mm
compartment fillet (radius) 0 mm

📦 Model #1924

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 16–9 mm (Length: 40 mm)
Tube adapter STL 3D file ⌀ 16–9 mm (Length: 40 mm)
Inline tube junction ⌀16 mm to ⌀9 mm in STL format. Final length of this coupler is 40 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a length of 10 mm, the smaller one of 10 mm as well. The axes of the tubes are offset by 3.1 mm. The ends are not rounded.
Parameter Value Unit
side A length 10 mm
side A outer diameter 16 mm
side A thickness 2 mm
side B length 10 mm
side B outer diameter 9 mm
side B thickness 2 mm
transition length 20 mm
axis offset 3.1 mm
ends fillet no fillet

📦 Model #3574

2 object(s)
- format STL
Honeycomb grid STL file, center-to-center: 300x300mm, mesh: 10mm - Ø5mm
Honeycomb grid STL file, center-to-center: 300x300mm, mesh: 10mm - Ø5mm
View of object #0
Download this square grid file in STL format. Mounting holes are placed at the four corners (center-to-center 300x300 mm), each with a diameter of Ø5 mm. The overall dimensions reach 310x310 mm, with extra wide 10 mm cell size for peak ventilation. A secondary color accent gently outlines the perimeter. 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 300 mm
mesh size 10 mm
dual color yes
holes yes
hole diameter 5 mm

📦 Model #2590

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL 3D file ⌀124 mm to 156×176 mm, thickness 2 mm + offset
Round-to-Rectangular Tube Adapter STL 3D file ⌀124 mm to 156×176 mm, thickness 2 mm + offset
3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀124 mm and a rectangular section with internal dimensions 156×176 mm. The shell thickness is 2 mm and the overall length is 50 mm. The adapter has an offset of 20 mm along the Y axis and 20 mm along the Z axis.
Parameter Value Unit
cylinder outer diameter 124 mm
cylinder inlet length 5 mm
rectangle internal length 156 mm
rectangle internal height 176 mm
rectangle inlet length 5 mm
offset Z 20 mm
offset Y 20 mm
total length 50 mm
thickness 2 mm
chamfer no chamfer

📦 Model #1787

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL file ⌀150 mm to 150×50 mm, thickness 2 mm + offset
Round-to-Rectangular Tube Adapter STL file ⌀150 mm to 150×50 mm, thickness 2 mm + offset
3D file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀150 mm and a rectangular section with internal dimensions 150×50 mm. The shell thickness is 2 mm and the total length is 60 mm. The adapter has an offset of 17.5 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 150 mm
cylinder inlet length 15 mm
rectangle internal length 150 mm
rectangle internal height 50 mm
rectangle inlet length 10 mm
offset Z 17.5 mm
offset Y 0 mm
total length 60 mm
thickness 2 mm
chamfer chamfers on ...

📦 Model #3889

1 object(s)
- format STL
Tubing adapter STL 3D file ⌀ 90–46 mm (Length: 50 mm)
Tubing adapter STL 3D file ⌀ 90–46 mm (Length: 50 mm)
Inline tubing adapter ⌀90 mm to ⌀46 mm in STL format. Total length of this junction is 50 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a sleeve length of 10 mm, the smaller one of 20 mm. The ends have no fillet.
Parameter Value Unit
side A length 10 mm
side A outer diameter 90 mm
side A thickness 3 mm
side B length 20 mm
side B outer diameter 46 mm
side B thickness 3 mm
transition length 20 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #3666

1 object(s)
- format STL
O-ring STL 3D file ID 60 × CS 2 mm
O-ring STL 3D file ID 60 × CS 2 mm
3D file of circular seal with ID 60 mm by CS 2  mm. Outer diameter (OD, for outer diameter) resulting is therefore 64 mm.
Parameter Value Unit
inner diameter (ID) 60 mm
cross section (CS) 2 mm

📦 Model #3910

1 object(s)
- format STL
O-ring STL 3D file ID 25 × CS 1.5 mm
O-ring STL 3D file ID 25 × CS 1.5 mm
STL file of sealing ring with dimensions ID (inner diameter) 25 mm / section thickness 1.5  mm. Outer diameter (OD) resulting is therefore 28 mm.
Parameter Value Unit
inner diameter (ID) 25 mm
cross section (CS) 1.5 mm

📦 Model #973

1 object(s)
- format STL
U-shaped handle STL file 50×140×10 mm (Center-to-center 130 mm)
U-shaped handle STL file 50×140×10 mm (Center-to-center 130 mm)
Download this 3D file of a simple U-shaped drawer handle. The overall dimensions are 50×140×10 mm. This handle has a circular profile combined with a smooth transition. The openings are 4 mm diameter and have a 130 mm center-to-center distance.
Parameter Value Unit
width 50 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 #3907

2 object(s)
- format STL
Round box with lid STL file ⌀ 80 mm - Height: 50 mm, Shell: 2 mm
Round box with lid STL file ⌀ 80 mm - Height: 50 mm, Shell: 2 mm
View of object #0
Download this round box model in STL format. Its diameter is 80 mm and its total height is 50 mm. The wall thickness is 2 mm.
Parameter Value Unit
external diameter 80 mm
total height 50 mm
wall thickness 2 mm
fit clearance 0.5 mm
inner bottom fillet 0 mm

📦 Model #3800

1 object(s)
- format STL
Honeycomb grille STL file, center-to-center: 300x300mm, mesh: 8mm - Ø8mm
Honeycomb grille STL file, center-to-center: 300x300mm, mesh: 8mm - Ø8mm
Fan guard model in STL format. Mounting holes are placed at the four corners (center-to-center 300x300 mm), each with a diameter of Ø8 mm. The overall dimensions reach 316x316 mm, with large 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 300 mm
width or center-to-center 300 mm
mesh size 8 mm
dual color no
holes yes
hole diameter 8 mm

📦 Model #3805

2 object(s)
- format STL
Enclosure with screw-mounted lid STL 3D file: 100×80×30 mm
Enclosure with screw-mounted lid STL 3D file: 100×80×30 mm
View of object #0
Enclosure model with screwed lid in STL format. The dimensions are 100 mm long by 80 mm wide and 30 mm high. The cover is 10 mm high. Wall thickness is 3 mm. The enclosure does not feature cooling.
Parameter Value Unit
length 100 mm
width 80 mm
total height 30 mm
lid height 10 mm
wall thickness 3 mm
screw margin 0.1 mm
fit clearance 0.1 mm
cooling zone(s) no cutouts

📦 Model #2181

2 object(s)
- format STL
Round box with lid STL 3D file ⌀ 20 mm - Height: 100 mm, Shell: 2 mm
Round box with lid STL 3D file ⌀ 20 mm - Height: 100 mm, Shell: 2 mm
View of object #0
Get this cylindrical box in 3D STL format. Its diameter is 20 mm and its total height is 100 mm. The walls have a thickness of 2 mm.
Parameter Value Unit
external diameter 20 mm
total height 100 mm
wall thickness 2 mm
fit clearance 0.1 mm
inner bottom fillet 0 mm

📦 Model #822

1 object(s)
- format STL
U-shaped handle STL file 35×100×14 mm (Center-to-center 86 mm)
U-shaped handle STL file 35×100×14 mm (Center-to-center 86 mm)
Download this STL 3D model of a U-shaped drawer handle. The overall dimensions are 35×100×14 mm. This handle features a square cross-section combined with a smooth transition. The mounting holes are 6 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) 0
transition (0:right,1:rounded) 1
fillet radius 0 mm
hole diameter 6 mm

📦 Model #873

1 object(s)
- format STL
U-shaped handle STL file 35×140×14 mm (Center-to-center 126 mm)
U-shaped handle STL file 35×140×14 mm (Center-to-center 126 mm)
Download this STL 3D model of a simple U-shaped drawer handle. The overall dimensions are 35×140×14 mm. This handle has a square profile combined with a straight transition. A fillet along the edges produces a softer grip. The holes are 6 mm diameter with a center-to-center distance of 126 mm.
Parameter Value Unit
width 35 mm
length 140 mm
thickness 14 mm
shape (0:square,1:circle) 0
transition (0:right,1:rounded) 0
fillet radius 1 mm
hole diameter 6 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.