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Tube adapter STL 3D file ⌀ 100–16 mm (Length: 110 mm)

Pipe clip holder Ø50 mm STL file · Countersunk screw Ø5 mm

Tube adapter STL file ⌀ 100–51 mm (Length: 160 mm)

Pipe elbow STL 3D file 10° ⌀OD: 40 mm ⌀ID: 34 mm thickness: 3 mm

L-bracket 250×100 mm STL file, thickness 8 mm, hole diameter 6 mm

Clip-on pipe holder Ø40 mm STL 3D file · Pan head screw Ø5 mm

Enclosure with screw-mounted lid STL file: 90×50×40 mm (with ventilation on the lid)

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

Round air vent STL 3D file ∅ 70 mm, slat angle: 45° with central reinforcement

Round-to-Rectangular Tube Adapter STL file ⌀125 mm to 60×60 mm, thickness 3 mm

The easiest way to get custom 3D files!

Featured Model

Enclosure with screw-mounted lid STL file: 80×80×20 mm 📦 #1156

2 object(s) - format STL

Latest model generated online:

Round-to-Rectangular Tube Adapter STL 3D file ⌀101.5 mm to 203×12.5 mm, thickness 3 mm + offset 📦 #3681

1 object(s) - format STL

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 #1959

1 object(s)

- format STL

Tube adapter STL file ⌀ 183–90 mm (Length: 117 mm)

Tube adapter ⌀183 mm to ⌀90 mm in STL 3D format. Length of this sleeve is 117 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a sleeve length of 50 mm, the smaller one of 17 mm. The ends are not rounded.

Parameter	Value	Unit
side A length	50	mm
side A outer diameter	183	mm
side A thickness	3	mm
side B length	17	mm
side B outer diameter	90	mm
side B thickness	3	mm
transition length	50	mm
axis offset	0	mm
ends fillet	no fillet

📦 Model #1042

1 object(s)

- format STL

O'ring STL 3D file ID 3 × CS 1 mm

STL file of O-ring (torus-shaped seal) with dimensions Internal diameter (ID) 3 mm / CS 1 mm. Outer diameter (OD, for outer diameter) is 5 mm.

Parameter	Value	Unit
inner diameter (ID)	3	mm
cross section (CS)	1	mm

📦 Model #3457

1 object(s)

- format STL

Tubing elbow STL 3D file 90° ⌀OD: 55 mm ⌀ID: 50 mm thickness: 2.5 mm

Model of an elbow with a 90° angle in STL format. This elbow features an outer diameter of 55 mm and an inner diameter of 50 mm. This results in a tube thickness of 2.5 mm.

Parameter	Value	Unit
outer diameter	55	mm
inner diameter	50	mm
angle	90	°
end fillets	no

📦 Model #3441

1 object(s)

- format STL

Honeycomb grille STL file, 250x150mm, mesh: 6mm

3D rectangular grid file in STL format. The overall size is 250x150 mm, with large 6 mm cell size to enhance ventilation. This grid provides both mechanical protection and airflow.

Parameter	Value	Unit
length or center-to-center	250	mm
width or center-to-center	150	mm
mesh size	6	mm
dual color	no
holes	no

📦 Model #1301

1 object(s)

- format STL

Round air vent STL file ∅ 85 mm, slat angle: 35°

3D design of a round vent cover for air circulation in STL format. Its male diameter measures 85 mm. The slats have an angle of 35° and a low thickness of 1.6 mm. This vent grille features a thin flange of 4 mm. The total diameter of this model is 93 mm.

Parameter	Value	Unit
male diameter	85	mm
slat angle	35	°
slat thickness	1.6	mm
flange width	4	mm
central reinforcement	no

📦 Model #3476

1 object(s)

- format STL

Multi-compartment box STL file: 16 compartments of 52×52×70 mm

This 3D model in STL format provides 16 sections measuring 52×52×70mm each. The total dimensions are 218×218×72mm. A 3mm fillet applied to all compartments provide a better grip stored in the compartments.

Parameter	Value	Unit
number of rows	4
number of columns	4
compartment length	52	mm
compartment width	52	mm
compartment height	70	mm
wall thickness	2	mm
compartment fillet (radius)	3	mm

📦 Model #3443

1 object(s)

- format STL

Protective grid STL file, center-to-center: 150x150mm, mesh: 6mm - Ø5mm

Download this square honeycomb grid file in STL format. Mounting holes are placed at the four corners (center-to-center 150x150 mm), each with a diameter of Ø5 mm. The overall dimensions reach 160x160 mm, with open 6 mm cell size to maximize airflow. This grid functions as both a mechanical guard and a ventilation panel.

Parameter	Value	Unit
length or center-to-center	150	mm
width or center-to-center	150	mm
mesh size	6	mm
dual color	no
holes	yes
hole diameter	5	mm

📦 Model #3428

1 object(s)

- format STL

Tubing elbow STL 3D file 90° ⌀OD: 61.5 mm ⌀ID: 59 mm thickness: 1.25 mm

3D model of a tubing elbow with a 90° angle in STL format. This elbow has an outer diameter of 61.5 mm and an inner diameter of 59 mm. The tube thickness is therefore 1.25 mm. The ends feature fillets to make it easier to assemble.

Parameter	Value	Unit
outer diameter	61.5	mm
inner diameter	59	mm
angle	90	°
end fillets	yes

📦 Model #3430

1 object(s)

- format STL

Round-to-Rectangular Tube Adapter STL 3D file ⌀50 mm to 100×45 mm, thickness 2 mm

Model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀50 mm and a rectangular section with internal dimensions 100×45 mm. The shell thickness is 2 mm and the total length is 80 mm. A chamfer is applied on the outside of the cylindrical end to ease insertion.

Parameter	Value	Unit
cylinder outer diameter	50	mm
cylinder inlet length	20	mm
rectangle internal length	100	mm
rectangle internal height	45	mm
rectangle inlet length	20	mm
offset Z	0	mm
offset Y	0	mm
total length	80	mm
thickness	2	mm
chamfer	chamfer on t...

📦 Model #1041

1 object(s)

- format STL

O-ring STL 3D file ID 3 × CS 1.5 mm

Model of rubber ring with Internal diameter (ID) 3 mm / section thickness 1.5 mm. The outer diameter resulting corresponds to 6 mm.

Parameter	Value	Unit
inner diameter (ID)	3	mm
cross section (CS)	1.5	mm

📦 Model #1341

1 object(s)

- format STL

Tube adapter STL file ⌀ 100–16 mm (Length: 140 mm)

Inline tube coupler ⌀100 mm to ⌀16 mm in STL 3D format. Final length of this sleeve is 140 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a length of 10 mm, the smaller one of 30 mm. The ends are not rounded.

Parameter	Value	Unit
side A length	10	mm
side A outer diameter	100	mm
side A thickness	3	mm
side B length	30	mm
side B outer diameter	16	mm
side B thickness	3	mm
transition length	100	mm
axis offset	0	mm
ends fillet	no fillet

📦 Model #1978

2 object(s)

- format STL

Round box with lid STL 3D file ⌀ 50 mm - Height: 25 mm, Shell: 2 mm

Download this circular box in STL format. Its diameter is 50 mm and its height is 25 mm. The wall width is 2 mm. A fillet located at the bottom of the box makes it easier to grip objects.

Parameter	Value	Unit
external diameter	50	mm
total height	25	mm
wall thickness	2	mm
fit clearance	1	mm
inner bottom fillet	1	mm

📦 Model #1273

2 object(s)

- format STL

Round box with lid STL 3D file ⌀ 30 mm - Height: 20 mm, Shell: 3 mm

Get this round organizing box in 3D STL format. Its diameter is 30 mm and its height is 20 mm. The wall width is 3 mm. A large fillet located at the bottom of the box makes it easier to grip stored objects inside.

Parameter	Value	Unit
external diameter	30	mm
total height	20	mm
wall thickness	3	mm
fit clearance	0.1	mm
inner bottom fillet	3	mm

📦 Model #3452

1 object(s)

- format STL

Washer / Flat Gasket STL file ⌀ID: 8 mm ⌀OD: 15 mm thickness: 2.2 mm + chamfer

3D file of flat gasket / washer in STL file format. This part has an internal diameter of ⌀8 mm and an external diameter of ⌀15 mm. The part thickness is 2.2 mm. A chamfer is present on the internal diameter with a value of 1.2 mm.

Parameter	Value	Unit
inner diameter	8	mm
outer diameter	15	mm
thickness	2.2	mm
finish	chamfer
finish position	inner
sides	one side
finish value	1.2	mm

📦 Model #1477

1 object(s)

- format STL

Tube adapter STL file ⌀ 110–100 mm (Length: 270 mm)

Diameter adapter ⌀110 mm to ⌀100 mm in STL format. Final length of this sleeve is 270 mm. The thickness of the tubes is identical: 5 mm. The larger-diameter tube has a length of 150 mm, the smaller one of 100 mm. The ends have a fillet on the outside.

Parameter	Value	Unit
side A length	150	mm
side A outer diameter	110	mm
side A thickness	5	mm
side B length	100	mm
side B outer diameter	100	mm
side B thickness	5	mm
transition length	20	mm
axis offset	0	mm
ends fillet	fillet on th...

📦 Model #3372

2 object(s)

- format STL

Round box with lid STL file ⌀ 55 mm - Height: 26 mm, Shell: 3 mm

Download this round organizing box model in 3D STL format. Its diameter is 55 mm and its total height is 26 mm. The wall width is 3 mm. A fillet located at the bottom of the box makes it easier to grab stored objects inside.

Parameter	Value	Unit
external diameter	55	mm
total height	26	mm
wall thickness	3	mm
fit clearance	0.1	mm
inner bottom fillet	1	mm

📦 Model #3360

1 object(s)

- format STL

Honeycomb grille STL 3D file, center-to-center: 300x300mm, mesh: 10mm - Ø8mm

3D square protective grid file 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 very open 10 mm cell size for maximum airflow. 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	10	mm
dual color	no
holes	yes
hole diameter	8	mm

📦 Model #3310

1 object(s)

- format STL

Round-to-Rectangular Tube Adapter STL 3D file ⌀106 mm to 94.6×73 mm, thickness 2 mm + offset

Download this file in STL format of a round-to-rectangular adapter with an external diameter of ⌀106 mm and a rectangular section with inner dimensions 94.6×73 mm. The shell thickness is 2 mm and the overall length is 200 mm. The adapter has an offset of 25 mm along the Y axis.

Parameter	Value	Unit
cylinder outer diameter	106	mm
cylinder inlet length	50	mm
rectangle internal length	94.6	mm
rectangle internal height	73	mm
rectangle inlet length	100	mm
offset Z	0	mm
offset Y	25	mm
total length	200	mm
thickness	2	mm
chamfer	no chamfer

📦 Model #3548

1 object(s)

- format STL

Protective grid STL file, center-to-center: 105x105mm, mesh: 6mm - Ø5mm

3D square honeycomb grid model in STL format. Mounting holes are placed at the four corners (center-to-center 105x105 mm), each with a diameter of Ø5 mm. The overall dimensions reach 115x115 mm, with open 6 mm cell size to maximize airflow. This grid serves as both a protective guard and a ventilation panel.

Parameter	Value	Unit
length or center-to-center	105	mm
width or center-to-center	105	mm
mesh size	6	mm
dual color	no
holes	yes
hole diameter	5	mm

📦 Model #1750

1 object(s)

- format STL

Round-to-Rectangular Tube Adapter STL file ⌀43 mm to 25×6 mm, thickness 2 mm

Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀43 mm and a rectangular section with internal dimensions 25×6 mm. The wall thickness is 2 mm and the overall length is 100 mm.

Parameter	Value	Unit
cylinder outer diameter	43	mm
cylinder inlet length	25	mm
rectangle internal length	25	mm
rectangle internal height	6	mm
rectangle inlet length	19	mm
offset Z	0	mm
offset Y	0	mm
total length	100	mm
thickness	2	mm
chamfer	no chamfer

📦 Model #3447

1 object(s)

- format STL

Washer / Flat Gasket STL file ⌀ID: 9 mm ⌀OD: 18 mm thickness: 2.8 mm + chamfer

Download this 3D file of flat gasket / washer in STL 3D file format. This part features an inner diameter of ⌀9 mm and an outer diameter of ⌀18 mm. The total thickness is 2.8 mm. A chamfer is present on the inner diameter with a value of 1.2 mm.

Parameter	Value	Unit
inner diameter	9	mm
outer diameter	18	mm
thickness	2.8	mm
finish	chamfer
finish position	inner
sides	one side
finish value	1.2	mm

📦 Model #3483

1 object(s)

- format STL

Round-to-Rectangular Tube Adapter STL 3D file ⌀50 mm to 120×126 mm, thickness 3 mm

Model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀50 mm and a rectangular section with internal dimensions 120×126 mm. The shell thickness is 3 mm and the total length is 200 mm.

Parameter	Value	Unit
cylinder outer diameter	50	mm
cylinder inlet length	50	mm
rectangle internal length	120	mm
rectangle internal height	126	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	200	mm
thickness	3	mm
chamfer	no chamfer

📦 Model #1245

2 object(s)

- format STL

Enclosure with screw-mounted lid STL 3D file: 120×45×30 mm (with ventilation on the lid and under the enclosure)

Enclosure with screwed lid in 3D STL format. The dimensions are 120 mm long by 45 mm wide and 30 mm high. The lid only measures 10 mm high. Wall thickness is 3 mm. This enclosure has marked cooling area on the lid and under the base.

Parameter	Value	Unit
length	120	mm
width	45	mm
total height	30	mm
lid height	10	mm
wall thickness	3	mm
screw margin	0	mm
fit clearance	0.1	mm
cooling level	5
cooling zone(s)	cutouts on b...

📦 Model #805

1 object(s)

- format STL

U-shaped handle STL 3D file 35×100×10 mm (Center-to-center 90 mm)

Download this STL 3D model of a U-shaped handle. The external dimensions are 35×100×10 mm. This handle features a square cross-section combined with a smooth transition. A fillet produces a better tactile feel. The openings are 4 mm diameter with a center-to-center distance of 90 mm.

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	1	mm
hole diameter	4	mm

📦 Model #1149

2 object(s)

- format STL

Enclosure with screw-mounted lid STL 3D file: 300×100×60 mm

Enclosure model with screwed lid in STL format. The dimensions are 300 mm long by 100 mm wide and 60 mm high. The lid is 20 mm high. Wall thickness is 5 mm. The enclosure does not have cooling.

Parameter	Value	Unit
length	300	mm
width	100	mm
total height	60	mm
lid height	20	mm
wall thickness	5	mm
screw margin	0	mm
fit clearance	0.1	mm
cooling zone(s)	no cutouts

📦 Model #2033

1 object(s)

- format STL

Tube adapter STL 3D file ⌀ 35–34 mm (Length: 100 mm)

Tube reducer ⌀35 mm to ⌀34 mm in STL 3D format. Final length of this adapter is 100 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a sleeve length of 40 mm, the smaller one of 40 mm as well. The ends feature a fillet.

Parameter	Value	Unit
side A length	40	mm
side A outer diameter	35	mm
side A thickness	3	mm
side B length	40	mm
side B outer diameter	34	mm
side B thickness	3	mm
transition length	20	mm
axis offset	0	mm
ends fillet	fillet on bo...

📦 Model #1015

1 object(s)

- format STL

O-ring STL 3D file ID 7 × CS 2 mm

Model of rubber ring with dimensions Inner diameter 7 mm × thickness 2 mm. Final diameter resulting is therefore 11 mm.

Parameter	Value	Unit
inner diameter (ID)	7	mm
cross section (CS)	2	mm

📦 Model #891

1 object(s)

- format STL

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

Download this 3D file of a U-shaped handle. The external dimensions are 35×140×20 mm. The handle features a square section combined with a right-angled transition. A fillet ensures a better tactile feel. The holes are 6 mm diameter and have a 120 mm center-to-center distance.

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	6	mm

📦 Model #2513

3 object(s)

- format STL

Small parts organizer with 1 drawer 40×30×150 mm STL 3D file, thickness: 2 mm

3D model of a DIY organizer in STL format. This model includes 1 box, arranged in 1 rows and 1 columns. Practically speaking, this means 1 rows of 1 boxes. Each box measures 40 mm wide, 30 mm high, and 150 mm deep. The wall thickness is 2 mm. The box features 2 dividers, allowing up to 3 sections. The global dimensions of the box measure 48.5 x 36.5 x 156 mm. All the objects in this model were designed to be printed without support.

Parameter	Value	Unit
number of rows	1
number of columns	1
inner drawer depth	150	mm
inner drawer width	40	mm
inner drawer height	30	mm
wall thickness	2	mm
removable divider	two divider ...

📦 Model #3410

1 object(s)

- format STL

Tube adapter STL 3D file ⌀ 37–33 mm (Length: 80 mm)

Inline tubing adapter ⌀37 mm to ⌀33 mm in STL format. Final length of this junction is 80 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 30 mm, the smaller one of 30 mm as well. The ends are not rounded.

Parameter	Value	Unit
side A length	30	mm
side A outer diameter	37	mm
side A thickness	2	mm
side B length	30	mm
side B outer diameter	33	mm
side B thickness	2	mm
transition length	20	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.