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O'ring STL file ID 66 × CS 4 mm 📦 #3609

1 object(s) - format STL

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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!

A selection of custom 3D models

Download this STL 3D file of a U-shaped furniture handle. The external dimensions are 50×140×14 mm. This handle features a square cross-section and a smooth transition. A light fillet along the edges ensures a softer grip. The bores are 5 mm diameter with a center-to-center distance of 126 mm.
Parameter Value Unit
width 50 mm
length 140 mm
thickness 14 mm
shape (0:square,1:circle) 0
transition (0:right,1:rounded) 1
fillet radius 1 mm
hole diameter 5 mm
Download this file of a simple U-shaped drawer handle. The external dimensions are 50×140×20 mm. The handle has a round cross-section combined with a straight transition. The bores are 5 mm diameter and have a 120 mm center-to-center distance.
Parameter Value Unit
width 50 mm
length 140 mm
thickness 20 mm
shape (0:square,1:circle) 1
transition (0:right,1:rounded) 0
fillet radius 0 mm
hole diameter 5 mm

📦 Model #3378

2 object(s)
- format STL
Enclosure with screw-mounted lid STL 3D file: 140×70×30 mm
View of object #0
Download this enclosure model with lid in 3D STL format. The dimensions are 140 mm long by 70 mm wide and 30 mm high. The lid is 10 mm high. Side thickness is 2 mm. The enclosure does not feature cooling.
Parameter Value Unit
length 140 mm
width 70 mm
total height 30 mm
lid height 10 mm
wall thickness 2 mm
screw margin 0.2 mm
fit clearance 0.2 mm
cooling zone(s) no cutouts
This 3D model in STL format includes 8 cavities measuring 100×100×60mm each. Overall dimensions are 104×818×62mm. The compartments are not equipped with any fillet.
Parameter Value Unit
number of rows 8
number of columns 1
compartment length 100 mm
compartment width 100 mm
compartment height 60 mm
wall thickness 2 mm
compartment fillet (radius) 0 mm

📦 Model #2189

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 35–30 mm (Length: 55 mm)
Inline tube junction ⌀35 mm to ⌀30 mm in STL format. Total length of this adapter is 55 mm. The thickness of the tubes is identical: 3 mm. The larger-diameter tube has a length of 20 mm, the smaller one of 20 mm as well. The ends feature a fillet to make tube connection easier.
Parameter Value Unit
side A length 20 mm
side A outer diameter 35 mm
side A thickness 3 mm
side B length 20 mm
side B outer diameter 30 mm
side B thickness 3 mm
transition length 15 mm
axis offset 0 mm
ends fillet fillet on bo...
Download this enclosure model with lid in STL format. The dimensions are 150 mm long by 70 mm wide and 40 mm high. The cover is 10 mm high. Wall thickness is 2 mm. This enclosure has strong cooling area on the lid and under the base.
Parameter Value Unit
length 150 mm
width 70 mm
total height 40 mm
lid height 10 mm
wall thickness 2 mm
screw margin 0.2 mm
fit clearance 0.2 mm
cooling level 5
cooling zone(s) cutouts on b...
Download this square protective grid model in STL format. Mounting holes are placed at the four corners (center-to-center 30x30 mm), each with a diameter of Ø4 mm. The overall dimensions reach 38x38 mm, with medium 5 mm cell size for versatile use. This grid functions as both a mechanical guard and a ventilation panel.
Parameter Value Unit
length or center-to-center 30 mm
width or center-to-center 30 mm
mesh size 5 mm
dual color no
holes yes
hole diameter 4 mm

📦 Model #1387

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 155–90 mm (Length: 90 mm)
Inline tube adapter ⌀155 mm to ⌀90 mm in STL 3D format. Length of this reducer is 90 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 20 mm, the smaller one of 50 mm. The ends are rounded on the outside to facilitate the connection of the two tubes.
Parameter Value Unit
side A length 20 mm
side A outer diameter 155 mm
side A thickness 2 mm
side B length 50 mm
side B outer diameter 90 mm
side B thickness 2 mm
transition length 20 mm
axis offset 0 mm
ends fillet fillet on th...

📦 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
Download this file of a right-angle bracket reinforced in STL 3D format. The dimensions are 200 mm in length, 150 mm in height, 15 mm in width, and 8 mm in thickness. The 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 passages for fastening. No support is needed to print this bracket, placed flat directly on the build plate.
Parameter Value Unit
length 200 mm
height 150 mm
width 15 mm
thickness 8 mm
hole diameter 5 mm
chamfer on the holes yes

📦 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 #1358

1 object(s)
- format STL
Tube adapter STL file ⌀ 76–50 mm (Length: 60 mm)
Straight tube fitting ⌀76 mm to ⌀50 mm in STL 3D format. Length of this fitting is 60 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 20 mm, the smaller one of 20 mm as well. The ends feature an internal fillet.
Parameter Value Unit
side A length 20 mm
side A outer diameter 76 mm
side A thickness 2 mm
side B length 20 mm
side B outer diameter 50 mm
side B thickness 2 mm
transition length 20 mm
axis offset 0 mm
ends fillet fillet on th...
Round box with lid STL 3D file ⌀ 60 mm - Height: 20 mm, Shell: 2 mm
View of object #0
Get this round storage box in STL format. Its diameter is 60 mm and its total height is 20 mm. The walls have a thickness of 2 mm.
Parameter Value Unit
external diameter 60 mm
total height 20 mm
wall thickness 2 mm
fit clearance 0.1 mm
inner bottom fillet 0 mm

📦 Model #3463

1 object(s)
- format STL
Tubing adapter STL 3D file ⌀ 68–45 mm (Length: 75 mm)
Straight tube fitting ⌀68 mm to ⌀45 mm in STL format. Length of this fitting is 75 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 68 mm
side A thickness 3 mm
side B length 30 mm
side B outer diameter 45 mm
side B thickness 3 mm
transition length 15 mm
axis offset 0 mm
ends fillet no fillet
Download this 3D file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀119 mm and a rectangular section with inner dimensions 114×79 mm. The shell thickness is 3 mm and the total length is 100 mm. The adapter has an offset of 3 mm along the Y axis and 10.5 mm along the Z axis.
Parameter Value Unit
cylinder outer diameter 119 mm
cylinder inlet length 30 mm
rectangle internal length 114 mm
rectangle internal height 79 mm
rectangle inlet length 30 mm
offset Z 10.5 mm
offset Y 3 mm
total length 100 mm
thickness 3 mm
chamfer no chamfer
Round box with lid STL 3D file ⌀ 30 mm - Height: 20 mm, Shell: 3 mm
View of object #0
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
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 of a tubing elbow with a 40° angle in STL format. This pipe elbow features an external diameter of 40 mm and an internal diameter of 39 mm. This results in a tube thickness of 0.5 mm. The ends feature fillets to make it easier to assemble.
Parameter Value Unit
outer diameter 40 mm
inner diameter 39 mm
angle 40 °
end fillets yes

📦 Model #1218

1 object(s)
- format STL
Tube adapter STL file ⌀ 80–75 mm (Length: 111 mm)
Diameter adapter ⌀80 mm to ⌀75 mm in STL 3D format. Final length of this connector is 111 mm. The thickness of the tubes is identical: 2.5 mm. The larger-diameter tube has a sleeve length of 46 mm, the smaller one of 45 mm. The two axes of the tubes are off-center by 2.4 mm. The ends have a fillet on the outside to facilitate the connection of the two tubes.
Parameter Value Unit
side A length 46 mm
side A outer diameter 80 mm
side A thickness 2.5 mm
side B length 45 mm
side B outer diameter 75 mm
side B thickness 2.5 mm
transition length 20 mm
axis offset 2.4 mm
ends fillet fillet on th...

📦 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
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
Download this STL 3D file of a U-shaped handle. The overall dimensions are 50×100×10 mm. The handle has a square section and a straight transition. A fillet along the edges allows for a more pleasant grip. The mounting holes are 5 mm diameter and have a 90 mm center-to-center distance.
Parameter Value Unit
width 50 mm
length 100 mm
thickness 10 mm
shape (0:square,1:circle) 0
transition (0:right,1:rounded) 0
fillet radius 1 mm
hole diameter 5 mm
Download this STL model of a U-shaped drawer handle. The overall dimensions are 50×100×14 mm. The handle features a round cross-section and a smooth transition. The openings are 5 mm diameter and have a 86 mm center-to-center distance.
Parameter Value Unit
width 50 mm
length 100 mm
thickness 14 mm
shape (0:square,1:circle) 1
transition (0:right,1:rounded) 1
fillet radius 0 mm
hole diameter 5 mm
Model of a pipe elbow with an 89° angle in STL format. This elbow has an external diameter of 76 mm and an internal diameter of 72 mm. This results in a tube thickness of 2 mm.
Parameter Value Unit
outer diameter 76 mm
inner diameter 72 mm
angle 89 °
end fillets no
Download this STL 3D file of a basic U-shaped handle. The external dimensions are 35×100×10 mm. The handle features a square section and a straight transition. A fillet ensures a more pleasant grip. The holes are 5 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) 0
fillet radius 1 mm
hole diameter 5 mm
Download this 3D square protective honeycomb grid model 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 very open 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 150 mm
width or center-to-center 150 mm
mesh size 10 mm
dual color no
holes yes
hole diameter 5 mm

📦 Model #1313

2 object(s)
- format STL
Enclosure with screw-mounted lid STL 3D file: 160×70×50 mm
View of object #0
Download this enclosure with screwed lid in 3D STL format. The dimensions are 160 mm long by 70 mm wide and 50 mm high. The lid only is 10 mm high. Side thickness is 3 mm. The enclosure does not have cooling.
Parameter Value Unit
length 160 mm
width 70 mm
total height 50 mm
lid height 10 mm
wall thickness 3 mm
screw margin 0 mm
fit clearance 0.1 mm
cooling zone(s) no cutouts
3D model of gasket / washer in STL format. This model features an inner diameter of ⌀262.5 mm and an outer diameter of ⌀300 mm. The part thickness is 6 mm. There is no finish available.
Parameter Value Unit
inner diameter 262.5 mm
outer diameter 300 mm
thickness 6 mm
finish none
Model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀44 mm and a rectangular section with inner dimensions 50×25 mm. The wall thickness is 2 mm and the overall length is 60 mm.
Parameter Value Unit
cylinder outer diameter 44 mm
cylinder inlet length 20 mm
rectangle internal length 50 mm
rectangle internal height 25 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 60 mm
thickness 2 mm
chamfer no chamfer
Round box with lid STL file ⌀ 45 mm - Height: 25 mm, Shell: 2 mm
View of object #0
Get this circular box model in 3D STL format. Its diameter is 45 mm and its height is 25 mm. The wall width is 2 mm.
Parameter Value Unit
external diameter 45 mm
total height 25 mm
wall thickness 2 mm
fit clearance 0.1 mm
inner bottom fillet 0 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.