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Pipe elbow STL 3D file 90° ⌀OD: 28 mm ⌀ID: 26 mm thickness: 1 mm 📦 #1403

1 object(s) - format STL

gizmo

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Protective grid STL 3D file, 200x40mm, mesh: 7mm 📦 #3998

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!

Read the article

A selection of custom 3D models

📦 Model #3580

1 object(s)
- format STL
Shelf bracket 125×100 mm STL file, thickness 12 mm, hole diameter 5 mm
Shelf bracket 125×100 mm STL file, thickness 12 mm, hole diameter 5 mm
Download this file of an angle bracket with a central reinforcing bar in STL 3D format. The dimensions are 125 mm in length, 100 mm in height, 20 mm in width, and 12 mm in thickness. The mounting holes have a diameter of 5 mm. Chamfers are done to the holes to seat the screw heads. The reinforcing bar enhances mechanical strength and provides two clearances for fastening. This bracket prints without support, printed flat on the print bed.
Parameter Value Unit
length 125 mm
height 100 mm
width 20 mm
thickness 12 mm
hole diameter 5 mm
chamfer on the holes yes

📦 Model #3679

1 object(s)
- format STL
Honeycomb grid STL file, center-to-center: 110x60mm, mesh: 3mm - Ø4mm
Honeycomb grid STL file, center-to-center: 110x60mm, mesh: 3mm - Ø4mm
3D rectangular honeycomb grid model as a STL file. Mounting holes are placed at the four corners (center-to-center 110x60 mm), each with a diameter of Ø4 mm. The overall dimensions reach 118x68 mm, with extra fine 3 mm cell size for strong protection. This grid provides both mechanical protection and airflow.
Parameter Value Unit
length or center-to-center 110 mm
width or center-to-center 60 mm
mesh size 3 mm
dual color no
holes yes
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 #1475

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL file ⌀120 mm to 60×40 mm, thickness 3 mm + offset
Round-to-Rectangular Tube Adapter STL file ⌀120 mm to 60×40 mm, thickness 3 mm + offset
File in STL format of a round-to-rectangular adapter with an external diameter of ⌀120 mm and a rectangular section with inner dimensions 60×40 mm. The shell thickness is 3 mm and the overall length is 100 mm. The adapter has an offset of 10 mm along the Y axis and 10 mm along the Z axis. Chamfers are present on the outside of the cylindrical end and on the inside of the rectangular end to ease insertion.
Parameter Value Unit
cylinder outer diameter 120 mm
cylinder inlet length 30 mm
rectangle internal length 60 mm
rectangle internal height 40 mm
rectangle inlet length 30 mm
offset Z 10 mm
offset Y 10 mm
total length 100 mm
thickness 3 mm
chamfer chamfers on ...

📦 Model #1843

1 object(s)
- format STL
Tube adapter STL file ⌀ 250–60 mm (Length: 80 mm)
Tube adapter STL file ⌀ 250–60 mm (Length: 80 mm)
Inline tube reducer ⌀250 mm to ⌀60 mm in STL format. Length of this reducer is 80 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a length of 20 mm, the smaller one of 20 mm as well. The ends are not rounded.
Parameter Value Unit
side A length 20 mm
side A outer diameter 250 mm
side A thickness 2 mm
side B length 20 mm
side B outer diameter 60 mm
side B thickness 2 mm
transition length 40 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #1985

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL 3D file ⌀75 mm to 125×22 mm, thickness 3 mm + offset
Round-to-Rectangular Tube Adapter STL 3D file ⌀75 mm to 125×22 mm, thickness 3 mm + offset
Download this 3D model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀75 mm and a rectangular section with inner dimensions 125×22 mm. The shell thickness is 3 mm and the overall length is 125 mm. The adapter has an offset of 12.5 mm along the Z axis. Chamfers are applied on the outside of the cylindrical end and on the inside of the rectangular end.
Parameter Value Unit
cylinder outer diameter 75 mm
cylinder inlet length 50 mm
rectangle internal length 125 mm
rectangle internal height 22 mm
rectangle inlet length 50 mm
offset Z 12.5 mm
offset Y 0 mm
total length 125 mm
thickness 3 mm
chamfer chamfers on ...

📦 Model #862

1 object(s)
- format STL
U-shaped handle STL file 35×140×10 mm (Center-to-center 130 mm)
U-shaped handle STL file 35×140×10 mm (Center-to-center 130 mm)
Download this STL file of a simple U-shaped drawer handle. The external dimensions are 35×140×10 mm. This handle has a round section combined with a 90-degree transition. The holes are 4 mm diameter with a center-to-center distance of 130 mm.
Parameter Value Unit
width 35 mm
length 140 mm
thickness 10 mm
shape (0:square,1:circle) 1
transition (0:right,1:rounded) 0
fillet radius 0 mm
hole diameter 4 mm

📦 Model #2368

2 object(s)
- format STL
Round box with lid STL 3D file ⌀ 29 mm - Height: 85 mm, Shell: 2 mm
Round box with lid STL 3D file ⌀ 29 mm - Height: 85 mm, Shell: 2 mm
View of object #0
Get this round box model in STL format. Its diameter is 29 mm and its total height is 85 mm. The wall thickness is 2 mm. A fillet located at the bottom of the box makes it easier to grab objects.
Parameter Value Unit
external diameter 29 mm
total height 85 mm
wall thickness 2 mm
fit clearance 0.1 mm
inner bottom fillet 1 mm

📦 Model #2062

1 object(s)
- format STL
Round air vent STL file ∅ 92 mm, slat angle: 30° with central reinforcement
Round air vent STL file ∅ 92 mm, slat angle: 30° with central reinforcement
Model of a round grille for air circulation in STL format. Its male diameter measures 92 mm. The slats have a slight angle of 30° and a low thickness of 1.4 mm. A central reinforcement reinforces the whole structure. This 3D vent grille has a thin flange of 5 mm. The full diameter of this model is 102 mm.
Parameter Value Unit
male diameter 92 mm
slat angle 30 °
slat thickness 1.4 mm
flange width 5 mm
central reinforcement yes

📦 Model #3559

1 object(s)
- format STL
Tube adapter STL 3D file ⌀ 70–25 mm (Length: 50 mm)
Tube adapter STL 3D file ⌀ 70–25 mm (Length: 50 mm)
Inline tube adapter ⌀70 mm to ⌀25 mm in STL 3D format. Total length of this sleeve is 50 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 8 mm, the smaller one of 20 mm. The ends are not rounded.
Parameter Value Unit
side A length 8 mm
side A outer diameter 70 mm
side A thickness 2 mm
side B length 20 mm
side B outer diameter 25 mm
side B thickness 2 mm
transition length 22 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #3675

1 object(s)
- format STL
Tube adapter STL file ⌀ 27–21 mm (Length: 395 mm)
Tube adapter STL file ⌀ 27–21 mm (Length: 395 mm)
Straight tube coupler ⌀27 mm to ⌀21 mm in STL 3D format. Total length of this sleeve is 395 mm. The thickness of the tubes is identical: 2 mm. The larger-diameter tube has a sleeve length of 60 mm, the smaller one of 300 mm. The ends have no fillet.
Parameter Value Unit
side A length 60 mm
side A outer diameter 27 mm
side A thickness 2 mm
side B length 300 mm
side B outer diameter 21 mm
side B thickness 2 mm
transition length 35 mm
axis offset 0 mm
ends fillet no fillet

📦 Model #3588

1 object(s)
- format STL
Honeycomb grid STL file, center-to-center: 250x140mm, mesh: 10mm - Ø5mm
Honeycomb grid STL file, center-to-center: 250x140mm, mesh: 10mm - Ø5mm
3D honeycomb protective rectangular grid file in STL format. Mounting holes are placed at the four corners (center-to-center 250x140 mm), each with a diameter of Ø5 mm. The overall dimensions reach 260x150 mm, with very open 10 mm cell size for peak ventilation. 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 140 mm
mesh size 10 mm
dual color no
holes yes
hole diameter 5 mm

📦 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 #917

1 object(s)
- format STL
U-shaped handle STL 3D file 50×100×10 mm (Center-to-center 90 mm)
U-shaped handle STL 3D file 50×100×10 mm (Center-to-center 90 mm)
Download this STL 3D model of a U-shaped furniture handle. The overall dimensions are 50×100×10 mm. The handle features a circular section combined with a right-angled transition. The openings are 5 mm diameter with a center-to-center distance of 90 mm.
Parameter Value Unit
width 50 mm
length 100 mm
thickness 10 mm
shape (0:square,1:circle) 1
transition (0:right,1:rounded) 0
fillet radius 0 mm
hole diameter 5 mm

📦 Model #854

1 object(s)
- format STL
U-shaped handle STL file 35×140×10 mm (Center-to-center 130 mm)
U-shaped handle STL file 35×140×10 mm (Center-to-center 130 mm)
Download this 3D model of a U-shaped handle. The external dimensions are 35×140×10 mm. The handle features a square section combined with a straight transition. A light fillet allows for a more comfortable grip. The mounting holes are 5 mm diameter and have a 130 mm center-to-center distance.
Parameter Value Unit
width 35 mm
length 140 mm
thickness 10 mm
shape (0:square,1:circle) 0
transition (0:right,1:rounded) 0
fillet radius 1 mm
hole diameter 5 mm

📦 Model #3576

1 object(s)
- format STL
Protective grid STL file, 75x75mm, mesh: 10mm
Protective grid STL file, 75x75mm, mesh: 10mm
Download this 3D square grid model in STL format. The overall size is 75x75 mm, with very large 10 mm cell size for peak ventilation. This grid functions as both a mechanical guard and a ventilation panel.
Parameter Value Unit
length or center-to-center 75 mm
width or center-to-center 75 mm
mesh size 10 mm
dual color no
holes no

📦 Model #2186

1 object(s)
- format STL
Tube adapter STL file ⌀ 52–25 mm (Length: 105 mm)
Tube adapter STL file ⌀ 52–25 mm (Length: 105 mm)
Tube junction ⌀52 mm to ⌀25 mm in STL 3D format. Final length of this junction is 105 mm. The larger-diameter tube has a thickness of 6 mm and a sleeve length of 40 mm. The smaller-diameter tube has a thickness of 3 mm and a length of 50 mm. The ends have a fillet to make tube connection easier.
Parameter Value Unit
side A length 40 mm
side A outer diameter 52 mm
side A thickness 6 mm
side B length 50 mm
side B outer diameter 25 mm
side B thickness 3 mm
transition length 15 mm
axis offset 0 mm
ends fillet fillet on bo...

📦 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 #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 #3658

1 object(s)
- format STL
Multi-compartment box STL 3D file: 16 compartments of 50×50×30 mm
Multi-compartment box STL 3D file: 16 compartments of 50×50×30 mm
This parametric compartment box provides 16 sections measuring 50×50×30mm each. The total dimensions are 210×210×32mm.
Parameter Value Unit
number of rows 4
number of columns 4
compartment length 50 mm
compartment width 50 mm
compartment height 30 mm
wall thickness 2 mm
compartment fillet (radius) 1 mm

📦 Model #1226

1 object(s)
- format STL
Multi-compartment box STL file: 8 compartments of 100×100×100 mm
Multi-compartment box STL file: 8 compartments of 100×100×100 mm
This printable sectioned box includes 8 storage spaces measuring 100×100×100mm each. Overall dimensions are 206×410×102mm. A 4mm fillet applied to all compartments help with item retrieval stored in the box.
Parameter Value Unit
number of rows 4
number of columns 2
compartment length 100 mm
compartment width 100 mm
compartment height 100 mm
wall thickness 2 mm
compartment fillet (radius) 4 mm

📦 Model #3598

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL file ⌀81 mm to 108×52 mm, thickness 3 mm + offset
Round-to-Rectangular Tube Adapter STL file ⌀81 mm to 108×52 mm, thickness 3 mm + offset
3D file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀81 mm and a rectangular section with inner dimensions 108×52 mm. The shell thickness is 3 mm and the total length is 120 mm. The adapter has an offset of 45 mm along the Y axis and 25 mm along the Z axis.
Parameter Value Unit
cylinder outer diameter 81 mm
cylinder inlet length 15 mm
rectangle internal length 108 mm
rectangle internal height 52 mm
rectangle inlet length 15 mm
offset Z 25 mm
offset Y 45 mm
total length 120 mm
thickness 3 mm
chamfer no chamfer

📦 Model #2392

3 object(s)
- format STL
Small parts organizer with 400 drawers 20×10×100 mm STL 3D file, thickness: 3 mm
Small parts organizer with 400 drawers 20×10×100 mm STL 3D file, thickness: 3 mm
View of object #0
Download this file of a drawer organizer in 3D STL format. This model includes 400 drawers, arranged in 20 rows and 20 columns. Specifically, this means 20 rows of 20 drawers. Each drawer measures 20 mm wide, 10 mm high, and 100 mm deep. The wall thickness is 3 mm, which makes the structure sturdy. The drawers include 2 dividers each, which allows up to 3 compartments per drawer and up to 1200 sections in total. The total size of the structure are 593 x 333 x 109 mm. All the objects in this model were designed to be printed without support.
Parameter Value Unit
number of rows 20
number of columns 20
inner drawer depth 100 mm
inner drawer width 20 mm
inner drawer height 10 mm
wall thickness 3 mm
removable divider two divider ...

📦 Model #3599

1 object(s)
- format STL
Washer / Flat Gasket STL 3D file ⌀ID: 10 mm ⌀OD: 30 mm thickness: 3 mm
Washer / Flat Gasket STL 3D file ⌀ID: 10 mm ⌀OD: 30 mm thickness: 3 mm
File of washer / flat gasket in STL 3D file format. This part has an inner diameter of ⌀10 mm and an outer diameter of ⌀30 mm. The part thickness is 3 mm. There is no finish present.
Parameter Value Unit
inner diameter 10 mm
outer diameter 30 mm
thickness 3 mm
finish none

📦 Model #2406

2 object(s)
- format STL
Small parts organizer with 12 drawers 40×80×50 mm STL 3D file, thickness: 2 mm
Small parts organizer with 12 drawers 40×80×50 mm STL 3D file, thickness: 2 mm
View of object #0
Download this 3D model of a DIY organizer in STL format. This model contains 12 boxes, arranged in 3 rows and 4 columns. In detail, this means 3 rows of 4 boxes. Each box has usable dimensions of 40 mm wide, 80 mm high, and 50 mm deep. The wall thickness is 2 mm. The global dimensions of the structure measure 188 x 255.5 x 56 mm. All the objects in this model were designed to be printed without support.
Parameter Value Unit
number of rows 3
number of columns 4
inner drawer depth 50 mm
inner drawer width 40 mm
inner drawer height 80 mm
wall thickness 2 mm
removable divider none

📦 Model #3611

1 object(s)
- format STL
O-ring STL file ID 10 × CS 4 mm
O-ring STL file ID 10 × CS 4 mm
3D model in STL format of rubber ring with Inner diameter 10 mm by CS (cross section) 4  mm. Final diameter resulting is therefore 18 mm.
Parameter Value Unit
inner diameter (ID) 10 mm
cross section (CS) 4 mm

📦 Model #1477

1 object(s)
- format STL
Tube adapter STL file ⌀ 110–100 mm (Length: 270 mm)
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 #3573

1 object(s)
- format STL
Round-to-Rectangular Tube Adapter STL file ⌀81 mm to 102×46 mm, thickness 3 mm + offset
Round-to-Rectangular Tube Adapter STL file ⌀81 mm to 102×46 mm, thickness 3 mm + offset
3D model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀81 mm and a rectangular section with internal dimensions 102×46 mm. The shell thickness is 3 mm and the total length is 100 mm. The adapter has an offset of 25 mm along the Y axis and 25 mm along the Z axis.
Parameter Value Unit
cylinder outer diameter 81 mm
cylinder inlet length 20 mm
rectangle internal length 102 mm
rectangle internal height 46 mm
rectangle inlet length 30 mm
offset Z 25 mm
offset Y 25 mm
total length 100 mm
thickness 3 mm
chamfer no chamfer

📦 Model #1993

1 object(s)
- format STL
Round air vent STL file ∅ 123 mm, slat angle: 45° with central reinforcement
Round air vent STL file ∅ 123 mm, slat angle: 45° with central reinforcement
3D model of a round vent cover for air circulation in STL format. Its male diameter is 123 mm. The slats have an angle of 45° and a high thickness of 2 mm. A central reinforcement reinforces the slats. This aeration grille has a prominent flange of 20 mm. The total diameter of the model is 163 mm.
Parameter Value Unit
male diameter 123 mm
slat angle 45 °
slat thickness 2 mm
flange width 20 mm
central reinforcement yes

📦 Model #2054

1 object(s)
- format STL
Round air vent STL 3D file ∅ 71 mm, slat angle: 40° with central reinforcement
Round air vent STL 3D file ∅ 71 mm, slat angle: 40° with central reinforcement
Model of a round air vent for ventilation in STL format. Its insertion diameter measures 71 mm. The slats have an angle of 40° and a high thickness of 2.4 mm. A centered vertical reinforcement reinforces the slats. This 3D aeration grille has a thin flange of 4 mm. The full diameter of the model is 79 mm.
Parameter Value Unit
male diameter 71 mm
slat angle 40 °
slat thickness 2.4 mm
flange width 4 mm
central reinforcement yes

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.