Round to rectangular adapter 3D models

First model: 2025-08-30

Number of 3D models generated: 1047

Category: technical parts

Loading...

Photos of various 3D printed models

This template allows the generation of adapters from a circular section to a rectangular section. It can find applications in fluid transfer systems, whether involving liquids (water flow) or gases (airflow).

Beyond the parameters inherent to this type of part, additional parameters include the possibility of applying an axis offset along the Y and Z axes.

It is also possible to apply chamfers to the ends to facilitate tube insertion.

A stop at the end of the rectangular section prevents the tube from moving further.

The design has been optimized to facilitate fluid flow rather than applying a sharp transition (through a simple loft).

The vast majority of these models can be printed without support, by laying the cylindrical side on the print bed.

Show more Show less

Keywords: round-rectangular connector, round-rectangular transition piece, circular-rectangular adapter, round-rectangular fitting, circular tube to rectangular tube transition, round duct to rectangular duct adapter, rectangular adapter

Quick Search & Generation

Enter at least one field.
If the model doesn’t exist, on-demand generation will be offered to you.

	name	unit	Value	Weight
#1	cylinder outer diameter 20 to 300 – up to 1 decimal place	mm
#2	cylinder inlet length 5 to 100 - integer	mm
#3	rectangle internal length 5 to 300 – up to 1 decimal place	mm
#4	rectangle internal height 5 to 300 – up to 1 decimal place	mm
#5	rectangle inlet length 5 to 100 - integer	mm
#6	offset Z 0 to 300 – up to 1 decimal place	mm
#7	offset Y 0 to 300 – up to 1 decimal place	mm
#8	total length 50 to 300 – up to 1 decimal place	mm
#9	thickness 2 to 5 - integer	mm
#10	chamfer		-	-
			Search

Additional information

See 3d modeling details

• If the chamfer option on the ends is enabled, the chamfer length is equal to half the thickness.
• The stop at the bottom of the rectangular section has a width equal to half the thickness.

Illustration of the parameters

Categories

Round to rectangular adapter
Cylinder outer diameter
20 to 100 mm

Round to rectangular adapter
Cylinder outer diameter
100 to 150 mm

Round to rectangular adapter
Cylinder outer diameter
150 to 200 mm

Round to rectangular adapter
Cylinder outer diameter
200 to 250 mm

Round to rectangular adapter
Cylinder outer diameter
250 mm and over

The latest online-generated models

Round-to-Rectangular Tube Adapter STL file ⌀75 mm to 120×30 mm, thickness 2 mm (📦 #12671)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀75 mm and a rectangular section with inner dimensions 120×30 mm. The shell thickness is 2 mm and the total length is 160 mm.

Parameter	Value	Unit
cylinder outer diameter	75	mm
cylinder inlet length	50	mm
rectangle internal length	120	mm
rectangle internal height	30	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	160	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀75 mm to 120×40 mm, thickness 2 mm (📦 #12670)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀75 mm and a rectangular section with internal dimensions 120×40 mm. The shell thickness is 2 mm and the overall length is 150 mm.

Parameter	Value	Unit
cylinder outer diameter	75	mm
cylinder inlet length	50	mm
rectangle internal length	120	mm
rectangle internal height	40	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	150	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀75 mm to 196×76 mm, thickness 2 mm (📦 #12603)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular adapter with an external diameter of ⌀75 mm and a rectangular section with internal dimensions 196×76 mm. The shell thickness is 2 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 to ease insertion.

Parameter	Value	Unit
cylinder outer diameter	75	mm
cylinder inlet length	30	mm
rectangle internal length	196	mm
rectangle internal height	76	mm
rectangle inlet length	39	mm
offset Z	0	mm
offset Y	0	mm
total length	100	mm
thickness	2	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀100 mm to 204×60 mm, thickness 2 mm + offset (📦 #12465)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀100 mm and a rectangular section with internal dimensions 204×60 mm. The shell thickness is 2 mm and the total length is 150 mm. The adapter has an offset of 32 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	100	mm
cylinder inlet length	30	mm
rectangle internal length	204	mm
rectangle internal height	60	mm
rectangle inlet length	30	mm
offset Z	32	mm
offset Y	0	mm
total length	150	mm
thickness	2	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀150 mm to 144×144 mm, thickness 3 mm (📦 #12460)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an external diameter of ⌀150 mm and a rectangular section with inner dimensions 144×144 mm. The shell thickness is 3 mm and the overall length is 200 mm.

Parameter	Value	Unit
cylinder outer diameter	150	mm
cylinder inlet length	30	mm
rectangle internal length	144	mm
rectangle internal height	144	mm
rectangle inlet length	30	mm
offset Z	0	mm
offset Y	0	mm
total length	200	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀103.8 mm to 140×100 mm, thickness 2 mm + offset (📦 #12394)

1 object(s) - format STL

3D model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀103.8 mm and a rectangular section with inner dimensions 140×100 mm. The shell thickness is 2 mm and the total length is 211 mm. The adapter has an offset of 70 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	103.8	mm
cylinder inlet length	20	mm
rectangle internal length	140	mm
rectangle internal height	100	mm
rectangle inlet length	50	mm
offset Z	70	mm
offset Y	0	mm
total length	211	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀206 mm to 170×100 mm, thickness 2 mm (📦 #12391)

1 object(s) - format STL

Download this 3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀206 mm and a rectangular section with internal dimensions 170×100 mm. The wall thickness is 2 mm and the total length is 120 mm.

Parameter	Value	Unit
cylinder outer diameter	206	mm
cylinder inlet length	20	mm
rectangle internal length	170	mm
rectangle internal height	100	mm
rectangle inlet length	20	mm
offset Z	0	mm
offset Y	0	mm
total length	120	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀206 mm to 174×104 mm, thickness 2 mm (📦 #12390)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀206 mm and a rectangular section with internal dimensions 174×104 mm. The shell thickness is 2 mm and the total length is 120 mm.

Parameter	Value	Unit
cylinder outer diameter	206	mm
cylinder inlet length	20	mm
rectangle internal length	174	mm
rectangle internal height	104	mm
rectangle inlet length	20	mm
offset Z	0	mm
offset Y	0	mm
total length	120	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀203 mm to 220×90 mm, thickness 3 mm (📦 #12389)

1 object(s) - format STL

Download this 3D model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀203 mm and a rectangular section with inner dimensions 220×90 mm. The shell thickness is 3 mm and the overall length is 120 mm.

Parameter	Value	Unit
cylinder outer diameter	203	mm
cylinder inlet length	10	mm
rectangle internal length	220	mm
rectangle internal height	90	mm
rectangle inlet length	10	mm
offset Z	0	mm
offset Y	0	mm
total length	120	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀110 mm to 300×300 mm, thickness 3 mm (📦 #12385)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀110 mm and a rectangular section with inner dimensions 300×300 mm. The wall thickness is 3 mm and the overall length is 100 mm. 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	110	mm
cylinder inlet length	15	mm
rectangle internal length	300	mm
rectangle internal height	300	mm
rectangle inlet length	35	mm
offset Z	0	mm
offset Y	0	mm
total length	100	mm
thickness	3	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL 3D file ⌀76 mm to 61×42 mm, thickness 2 mm (📦 #12366)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀76 mm and a rectangular section with internal dimensions 61×42 mm. The shell thickness is 2 mm and the overall length is 125 mm.

Parameter	Value	Unit
cylinder outer diameter	76	mm
cylinder inlet length	50	mm
rectangle internal length	61	mm
rectangle internal height	42	mm
rectangle inlet length	20	mm
offset Z	0	mm
offset Y	0	mm
total length	125	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀104 mm to 140×100 mm, thickness 2 mm + offset (📦 #12354)

1 object(s) - format STL

3D model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀104 mm and a rectangular section with inner dimensions 140×100 mm. The wall thickness is 2 mm and the total length is 215 mm. The adapter has an offset of 65 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	104	mm
cylinder inlet length	20	mm
rectangle internal length	140	mm
rectangle internal height	100	mm
rectangle inlet length	50	mm
offset Z	65	mm
offset Y	0	mm
total length	215	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀104 mm to 140×100 mm, thickness 2 mm + offset (📦 #12352)

1 object(s) - format STL

File in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀104 mm and a rectangular section with inner dimensions 140×100 mm. The wall thickness is 2 mm and the overall length is 220 mm. The adapter has an offset of 65 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	104	mm
cylinder inlet length	20	mm
rectangle internal length	140	mm
rectangle internal height	100	mm
rectangle inlet length	20	mm
offset Z	65	mm
offset Y	0	mm
total length	220	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀104 mm to 140×100 mm, thickness 2 mm + offset (📦 #12350)

1 object(s) - format STL

3D model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀104 mm and a rectangular section with internal dimensions 140×100 mm. The wall thickness is 2 mm and the total length is 220 mm. The adapter has an offset of 65 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	104	mm
cylinder inlet length	20	mm
rectangle internal length	140	mm
rectangle internal height	100	mm
rectangle inlet length	50	mm
offset Z	65	mm
offset Y	0	mm
total length	220	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀104 mm to 140×100 mm, thickness 2 mm + offset (📦 #12349)

1 object(s) - format STL

3D model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀104 mm and a rectangular section with inner dimensions 140×100 mm. The wall thickness is 2 mm and the total length is 220 mm. The adapter has an offset of 75 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	104	mm
cylinder inlet length	20	mm
rectangle internal length	140	mm
rectangle internal height	100	mm
rectangle inlet length	50	mm
offset Z	75	mm
offset Y	0	mm
total length	220	mm
thickness	2	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL 3D file ⌀109 mm to 86×86 mm, thickness 2 mm + offset (📦 #12348)

1 object(s) - format STL

Download this 3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀109 mm and a rectangular section with inner dimensions 86×86 mm. The wall thickness is 2 mm and the overall length is 80 mm. The adapter has an offset of 9 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	109	mm
cylinder inlet length	15	mm
rectangle internal length	86	mm
rectangle internal height	86	mm
rectangle inlet length	20	mm
offset Z	9	mm
offset Y	0	mm
total length	80	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀104 mm to 140×100 mm, thickness 2 mm (📦 #12347)

1 object(s) - format STL

Download this 3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀104 mm and a rectangular section with inner dimensions 140×100 mm. The shell thickness is 2 mm and the overall length is 220 mm. 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	104	mm
cylinder inlet length	30	mm
rectangle internal length	140	mm
rectangle internal height	100	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	220	mm
thickness	2	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL 3D file ⌀109 mm to 86×86 mm, thickness 2 mm + offset (📦 #12337)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an external diameter of ⌀109 mm and a rectangular section with internal dimensions 86×86 mm. The wall thickness is 2 mm and the total length is 80 mm. The adapter has an offset of 10 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	109	mm
cylinder inlet length	15	mm
rectangle internal length	86	mm
rectangle internal height	86	mm
rectangle inlet length	20	mm
offset Z	10	mm
offset Y	0	mm
total length	80	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀109 mm to 86×86 mm, thickness 2 mm + offset (📦 #12336)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an external diameter of ⌀109 mm and a rectangular section with inner dimensions 86×86 mm. The wall thickness is 2 mm and the total length is 80 mm. The adapter has an offset of 5 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	109	mm
cylinder inlet length	15	mm
rectangle internal length	86	mm
rectangle internal height	86	mm
rectangle inlet length	20	mm
offset Z	5	mm
offset Y	0	mm
total length	80	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀109 mm to 86×86 mm, thickness 2 mm + offset (📦 #12335)

1 object(s) - format STL

3D model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀109 mm and a rectangular section with internal dimensions 86×86 mm. The wall thickness is 2 mm and the total length is 85 mm. The adapter has an offset of 22 mm along the Y axis and 22 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	109	mm
cylinder inlet length	20	mm
rectangle internal length	86	mm
rectangle internal height	86	mm
rectangle inlet length	20	mm
offset Z	22	mm
offset Y	22	mm
total length	85	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀90 mm to 121×61 mm, thickness 3 mm + offset (📦 #12331)

1 object(s) - format STL

3D model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀90 mm and a rectangular section with inner dimensions 121×61 mm. The wall thickness is 3 mm and the total length is 200 mm. The adapter has an offset of 40 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	90	mm
cylinder inlet length	20	mm
rectangle internal length	121	mm
rectangle internal height	61	mm
rectangle inlet length	100	mm
offset Z	40	mm
offset Y	0	mm
total length	200	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀131 mm to 220×55 mm, thickness 3 mm + offset (📦 #12221)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀131 mm and a rectangular section with internal dimensions 220×55 mm. The shell thickness is 3 mm and the total length is 200 mm. The adapter has an offset of 60 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	131	mm
cylinder inlet length	30	mm
rectangle internal length	220	mm
rectangle internal height	55	mm
rectangle inlet length	30	mm
offset Z	60	mm
offset Y	0	mm
total length	200	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀132 mm to 114×58 mm, thickness 3 mm + offset (📦 #12176)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀132 mm and a rectangular section with internal dimensions 114×58 mm. The shell thickness is 3 mm and the overall length is 220 mm. The adapter has an offset of 35 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	132	mm
cylinder inlet length	50	mm
rectangle internal length	114	mm
rectangle internal height	58	mm
rectangle inlet length	100	mm
offset Z	35	mm
offset Y	0	mm
total length	220	mm
thickness	3	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀98 mm to 200×30 mm, thickness 3 mm + offset (📦 #12134)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀98 mm and a rectangular section with internal dimensions 200×30 mm. The shell thickness is 3 mm and the overall length is 150 mm. The adapter has an offset of 45 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	98	mm
cylinder inlet length	30	mm
rectangle internal length	200	mm
rectangle internal height	30	mm
rectangle inlet length	30	mm
offset Z	45	mm
offset Y	0	mm
total length	150	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀98 mm to 200×65 mm, thickness 3 mm (📦 #12116)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular adapter with an external diameter of ⌀98 mm and a rectangular section with inner dimensions 200×65 mm. The shell thickness is 3 mm and the overall length is 148 mm.

Parameter	Value	Unit
cylinder outer diameter	98	mm
cylinder inlet length	30	mm
rectangle internal length	200	mm
rectangle internal height	65	mm
rectangle inlet length	30	mm
offset Z	0	mm
offset Y	0	mm
total length	148	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀30 mm to 65.8×45.8 mm, thickness 2 mm (📦 #12105)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀30 mm and a rectangular section with internal dimensions 65.8×45.8 mm. The wall thickness is 2 mm and the overall length is 80 mm.

Parameter	Value	Unit
cylinder outer diameter	30	mm
cylinder inlet length	20	mm
rectangle internal length	65.8	mm
rectangle internal height	45.8	mm
rectangle inlet length	18	mm
offset Z	0	mm
offset Y	0	mm
total length	80	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀30 mm to 65.8×45.8 mm, thickness 2 mm (📦 #12103)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀30 mm and a rectangular section with inner dimensions 65.8×45.8 mm. The shell thickness is 2 mm and the overall length is 80 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	30	mm
cylinder inlet length	20	mm
rectangle internal length	65.8	mm
rectangle internal height	45.8	mm
rectangle inlet length	18	mm
offset Z	0	mm
offset Y	0	mm
total length	80	mm
thickness	2	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL 3D file ⌀100 mm to 96×145 mm, thickness 3 mm (📦 #12094)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an external diameter of ⌀100 mm and a rectangular section with internal dimensions 96×145 mm. The shell thickness is 3 mm and the total length is 120 mm. A chamfer is applied on the outside of the cylindrical end.

Parameter	Value	Unit
cylinder outer diameter	100	mm
cylinder inlet length	30	mm
rectangle internal length	96	mm
rectangle internal height	145	mm
rectangle inlet length	30	mm
offset Z	0	mm
offset Y	0	mm
total length	120	mm
thickness	3	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL file ⌀32 mm to 250×100 mm, thickness 5 mm (📦 #12062)

1 object(s) - format STL

Download this 3D model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀32 mm and a rectangular section with internal dimensions 250×100 mm. The wall thickness is 5 mm and the overall length is 180 mm.

Parameter	Value	Unit
cylinder outer diameter	32	mm
cylinder inlet length	40	mm
rectangle internal length	250	mm
rectangle internal height	100	mm
rectangle inlet length	25	mm
offset Z	0	mm
offset Y	0	mm
total length	180	mm
thickness	5	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀32 mm to 250×100 mm, thickness 5 mm (📦 #12061)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an outer diameter of ⌀32 mm and a rectangular section with inner dimensions 250×100 mm. The wall thickness is 5 mm and the overall length is 115 mm.

Parameter	Value	Unit
cylinder outer diameter	32	mm
cylinder inlet length	40	mm
rectangle internal length	250	mm
rectangle internal height	100	mm
rectangle inlet length	25	mm
offset Z	0	mm
offset Y	0	mm
total length	115	mm
thickness	5	mm
chamfer	no chamfer

Use cases for round-to-rectangular tube adapters

Round-to-rectangular adapters make it possible to connect two ducts of different shapes, ensuring a controlled transition between a cylindrical inlet and a rectangular or square outlet. 3D-printable, they can be used for both air and liquid flow in ventilation, transfer, or duct adjustment projects. Their parametric design allows precise definition of dimensions, lengths, and possible offsets for a configuration-specific fit.

The parametric generation system also makes it possible to create adapters where the circular inlet section is massive compared to the much smaller outlet, meeting specific connection requirements. This is the case with this geometry-evolving adapter, which provides a stable transition between very different sections without abrupt flow disruption.

When an offset between axes is required, an offset adapter allows adjustment of duct positioning while maintaining consistent wall thickness and a clean fit. This type of model simplifies assembly in setups where alignment is not perfect or requires slight mechanical offset.

Finally, a 80mm cylinder-to-80x80mm square adapter illustrates a more standard case: a simple conversion between a round tube and a square outlet, without offset. These 3D-printable adapters stand out for their precision and design flexibility, suitable for many technical connection applications.