Round to rectangular adapter 3D models

First model: 2025-08-30

Number of 3D models generated: 975

Category: technical parts

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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.

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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

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	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 3D file ⌀28 mm to 21.5×50.2 mm, thickness 4 mm (📦 #11368)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular adapter with an external diameter of ⌀28 mm and a rectangular section with inner dimensions 21.5×50.2 mm. The shell thickness is 4 mm and the total length is 79 mm.

Parameter	Value	Unit
cylinder outer diameter	28	mm
cylinder inlet length	40	mm
rectangle internal length	21.5	mm
rectangle internal height	50.2	mm
rectangle inlet length	19	mm
offset Z	0	mm
offset Y	0	mm
total length	79	mm
thickness	4	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀77 mm to 150×30 mm, thickness 4 mm + offset (📦 #11342)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular adapter with an external diameter of ⌀77 mm and a rectangular section with internal dimensions 150×30 mm. The wall thickness is 4 mm and the overall length is 200 mm. The adapter has an offset of 30 mm along the Z axis. A chamfer is present on the outside of the cylindrical end to ease insertion.

Parameter	Value	Unit
cylinder outer diameter	77	mm
cylinder inlet length	30	mm
rectangle internal length	150	mm
rectangle internal height	30	mm
rectangle inlet length	30	mm
offset Z	30	mm
offset Y	0	mm
total length	200	mm
thickness	4	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL file ⌀77 mm to 150×30 mm, thickness 4 mm + offset (📦 #11341)

1 object(s) - format STL

Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀77 mm and a rectangular section with inner dimensions 150×30 mm. The wall thickness is 4 mm and the overall length is 200 mm. The adapter has an offset of 60 mm along the Z axis. A chamfer is present on the outside of the cylindrical end.

Parameter	Value	Unit
cylinder outer diameter	77	mm
cylinder inlet length	30	mm
rectangle internal length	150	mm
rectangle internal height	30	mm
rectangle inlet length	30	mm
offset Z	60	mm
offset Y	0	mm
total length	200	mm
thickness	4	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL file ⌀108 mm to 200×200 mm, thickness 3 mm (📦 #11329)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an external diameter of ⌀108 mm and a rectangular section with internal dimensions 200×200 mm. The shell thickness is 3 mm and the overall length is 90 mm. Chamfers are applied on the outside of the cylindrical end and on the inside of the rectangular end.

Parameter	Value	Unit
cylinder outer diameter	108	mm
cylinder inlet length	30	mm
rectangle internal length	200	mm
rectangle internal height	200	mm
rectangle inlet length	30	mm
offset Z	0	mm
offset Y	0	mm
total length	90	mm
thickness	3	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀108 mm to 300×300 mm, thickness 3 mm (📦 #11320)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀108 mm and a rectangular section with inner dimensions 300×300 mm. The shell thickness is 3 mm and the total length is 200 mm. Chamfers are applied on the outside of the cylindrical end and on the inside of the rectangular end.

Parameter	Value	Unit
cylinder outer diameter	108	mm
cylinder inlet length	50	mm
rectangle internal length	300	mm
rectangle internal height	300	mm
rectangle inlet length	100	mm
offset Z	0	mm
offset Y	0	mm
total length	200	mm
thickness	3	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀108 mm to 300×300 mm, thickness 3 mm (📦 #11318)

1 object(s) - format STL

Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀108 mm and a rectangular section with internal dimensions 300×300 mm. The wall thickness is 3 mm and the total length is 140 mm. Chamfers are applied on the outside of the cylindrical end and on the inside of the rectangular end.

Parameter	Value	Unit
cylinder outer diameter	108	mm
cylinder inlet length	40	mm
rectangle internal length	300	mm
rectangle internal height	300	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	140	mm
thickness	3	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀190 mm to 220×81 mm, thickness 2 mm (📦 #11296)

1 object(s) - format STL

File in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀190 mm and a rectangular section with inner dimensions 220×81 mm. The shell thickness is 2 mm and the overall length is 200 mm.

Parameter	Value	Unit
cylinder outer diameter	190	mm
cylinder inlet length	50	mm
rectangle internal length	220	mm
rectangle internal height	81	mm
rectangle inlet length	100	mm
offset Z	0	mm
offset Y	0	mm
total length	200	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀158 mm to 86×86 mm, thickness 2 mm + offset (📦 #11256)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀158 mm and a rectangular section with inner dimensions 86×86 mm. The wall thickness is 2 mm and the overall length is 200 mm. The adapter has an offset of 68.5 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	158	mm
cylinder inlet length	23	mm
rectangle internal length	86	mm
rectangle internal height	86	mm
rectangle inlet length	40	mm
offset Z	68.5	mm
offset Y	0	mm
total length	200	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀89 mm to 165×83 mm, thickness 3 mm (📦 #11243)

1 object(s) - format STL

Model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀89 mm and a rectangular section with inner dimensions 165×83 mm. The wall thickness is 3 mm and the overall length is 150 mm.

Parameter	Value	Unit
cylinder outer diameter	89	mm
cylinder inlet length	50	mm
rectangle internal length	165	mm
rectangle internal height	83	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	150	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀89 mm to 178×83 mm, thickness 3 mm (📦 #11242)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an outer diameter of ⌀89 mm and a rectangular section with inner dimensions 178×83 mm. The shell thickness is 3 mm and the overall length is 150 mm.

Parameter	Value	Unit
cylinder outer diameter	89	mm
cylinder inlet length	50	mm
rectangle internal length	178	mm
rectangle internal height	83	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	150	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀89 mm to 178×83 mm, thickness 3 mm (📦 #11241)

1 object(s) - format STL

Download this 3D model in STL format of a round-to-rectangular adapter with an external diameter of ⌀89 mm and a rectangular section with internal dimensions 178×83 mm. The wall thickness is 3 mm and the total length is 200 mm.

Parameter	Value	Unit
cylinder outer diameter	89	mm
cylinder inlet length	50	mm
rectangle internal length	178	mm
rectangle internal height	83	mm
rectangle inlet length	50	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 file ⌀157 mm to 86×86 mm, thickness 2 mm + offset (📦 #11231)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀157 mm and a rectangular section with inner dimensions 86×86 mm. The shell thickness is 2 mm and the overall length is 200 mm. The adapter has an offset of 30 mm along the Y axis and 30 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	157	mm
cylinder inlet length	25	mm
rectangle internal length	86	mm
rectangle internal height	86	mm
rectangle inlet length	50	mm
offset Z	30	mm
offset Y	30	mm
total length	200	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀158 mm to 86×86 mm, thickness 2 mm (📦 #11230)

1 object(s) - format STL

Download this 3D model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀158 mm and a rectangular section with inner dimensions 86×86 mm. The wall thickness is 2 mm and the overall length is 245 mm.

Parameter	Value	Unit
cylinder outer diameter	158	mm
cylinder inlet length	23	mm
rectangle internal length	86	mm
rectangle internal height	86	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	245	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀50 mm to 100×26 mm, thickness 5 mm + offset (📦 #11182)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀50 mm and a rectangular section with internal dimensions 100×26 mm. The shell thickness is 5 mm and the total length is 200 mm. The adapter has an offset of 5 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	50	mm
cylinder inlet length	100	mm
rectangle internal length	100	mm
rectangle internal height	26	mm
rectangle inlet length	50	mm
offset Z	5	mm
offset Y	0	mm
total length	200	mm
thickness	5	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀76 mm to 140×35 mm, thickness 3 mm + offset (📦 #11180)

1 object(s) - format STL

Download this 3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀76 mm and a rectangular section with inner dimensions 140×35 mm. The wall thickness is 3 mm and the total length is 160 mm. The adapter has an offset of 40 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	76	mm
cylinder inlet length	35	mm
rectangle internal length	140	mm
rectangle internal height	35	mm
rectangle inlet length	40	mm
offset Z	40	mm
offset Y	0	mm
total length	160	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀78 mm to 85×62 mm, thickness 2 mm (📦 #11137)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular adapter with an external diameter of ⌀78 mm and a rectangular section with internal dimensions 85×62 mm. The wall thickness is 2 mm and the total length is 150 mm. A chamfer is present on the outside of the cylindrical end to ease insertion.

Parameter	Value	Unit
cylinder outer diameter	78	mm
cylinder inlet length	50	mm
rectangle internal length	85	mm
rectangle internal height	62	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	150	mm
thickness	2	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL file ⌀180 mm to 110×180 mm, thickness 2 mm (📦 #11089)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀180 mm and a rectangular section with internal dimensions 110×180 mm. The wall thickness is 2 mm and the overall length is 50 mm.

Parameter	Value	Unit
cylinder outer diameter	180	mm
cylinder inlet length	5	mm
rectangle internal length	110	mm
rectangle internal height	180	mm
rectangle inlet length	5	mm
offset Z	0	mm
offset Y	0	mm
total length	50	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀108 mm to 300×300 mm, thickness 3 mm + offset (📦 #11087)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀108 mm and a rectangular section with internal dimensions 300×300 mm. The wall thickness is 3 mm and the total length is 200 mm. The adapter has an offset of 20 mm along the Y axis and 20 mm along the Z axis. A chamfer is present on the outside of the cylindrical end to ease insertion.

Parameter	Value	Unit
cylinder outer diameter	108	mm
cylinder inlet length	80	mm
rectangle internal length	300	mm
rectangle internal height	300	mm
rectangle inlet length	60	mm
offset Z	20	mm
offset Y	20	mm
total length	200	mm
thickness	3	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL 3D file ⌀125 mm to 220×55 mm, thickness 3 mm (📦 #11024)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀125 mm and a rectangular section with internal dimensions 220×55 mm. The wall thickness is 3 mm and the total length is 200 mm.

Parameter	Value	Unit
cylinder outer diameter	125	mm
cylinder inlet length	50	mm
rectangle internal length	220	mm
rectangle internal height	55	mm
rectangle inlet length	50	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 file ⌀150 mm to 170×170 mm, thickness 4 mm (📦 #11013)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀150 mm and a rectangular section with inner dimensions 170×170 mm. The wall thickness is 4 mm and the total length is 80 mm. Chamfers are applied 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	40	mm
rectangle internal length	170	mm
rectangle internal height	170	mm
rectangle inlet length	10	mm
offset Z	0	mm
offset Y	0	mm
total length	80	mm
thickness	4	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL 3D file ⌀49.1 mm to 51×41 mm, thickness 2 mm + offset (📦 #10996)

1 object(s) - format STL

File in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀49.1 mm and a rectangular section with inner dimensions 51×41 mm. The shell thickness is 2 mm and the overall length is 100 mm. The adapter has an offset of 3 mm along the Z axis. A chamfer is applied on the outside of the cylindrical end to ease insertion.

Parameter	Value	Unit
cylinder outer diameter	49.1	mm
cylinder inlet length	35	mm
rectangle internal length	51	mm
rectangle internal height	41	mm
rectangle inlet length	35	mm
offset Z	3	mm
offset Y	0	mm
total length	100	mm
thickness	2	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL 3D file ⌀49.1 mm to 41×51 mm, thickness 2 mm (📦 #10994)

1 object(s) - format STL

Model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀49.1 mm and a rectangular section with internal dimensions 41×51 mm. The shell thickness is 2 mm and the total length is 100 mm. A chamfer is present on the outside of the cylindrical end to ease insertion.

Parameter	Value	Unit
cylinder outer diameter	49.1	mm
cylinder inlet length	35	mm
rectangle internal length	41	mm
rectangle internal height	51	mm
rectangle inlet length	35	mm
offset Z	0	mm
offset Y	0	mm
total length	100	mm
thickness	2	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL file ⌀49.1 mm to 53×43 mm, thickness 2 mm (📦 #10993)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular adapter with an external diameter of ⌀49.1 mm and a rectangular section with inner dimensions 53×43 mm. The shell thickness is 2 mm and the overall length is 100 mm. A chamfer is present on the outside of the cylindrical end.

Parameter	Value	Unit
cylinder outer diameter	49.1	mm
cylinder inlet length	35	mm
rectangle internal length	53	mm
rectangle internal height	43	mm
rectangle inlet length	35	mm
offset Z	0	mm
offset Y	0	mm
total length	100	mm
thickness	2	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL 3D file ⌀49.1 mm to 55×45 mm, thickness 2 mm (📦 #10992)

1 object(s) - format STL

Download this 3D model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀49.1 mm and a rectangular section with internal dimensions 55×45 mm. The wall thickness is 2 mm and the total length is 100 mm. A chamfer is present on the outside of the cylindrical end.

Parameter	Value	Unit
cylinder outer diameter	49.1	mm
cylinder inlet length	35	mm
rectangle internal length	55	mm
rectangle internal height	45	mm
rectangle inlet length	35	mm
offset Z	0	mm
offset Y	0	mm
total length	100	mm
thickness	2	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL 3D file ⌀47.1 mm to 53×42 mm, thickness 2 mm + offset (📦 #10991)

1 object(s) - format STL

Model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀47.1 mm and a rectangular section with internal dimensions 53×42 mm. The shell thickness is 2 mm and the overall length is 100 mm. The adapter has an offset of 15 mm along the Z axis. A chamfer is applied on the outside of the cylindrical end.

Parameter	Value	Unit
cylinder outer diameter	47.1	mm
cylinder inlet length	35	mm
rectangle internal length	53	mm
rectangle internal height	42	mm
rectangle inlet length	35	mm
offset Z	15	mm
offset Y	0	mm
total length	100	mm
thickness	2	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL file ⌀124 mm to 250×40 mm, thickness 5 mm (📦 #10989)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an external diameter of ⌀124 mm and a rectangular section with inner dimensions 250×40 mm. The wall thickness is 5 mm and the total length is 120 mm.

Parameter	Value	Unit
cylinder outer diameter	124	mm
cylinder inlet length	15	mm
rectangle internal length	250	mm
rectangle internal height	40	mm
rectangle inlet length	30	mm
offset Z	0	mm
offset Y	0	mm
total length	120	mm
thickness	5	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀124 mm to 250×40 mm, thickness 5 mm (📦 #10988)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular adapter with an external diameter of ⌀124 mm and a rectangular section with internal dimensions 250×40 mm. The wall thickness is 5 mm and the total length is 80 mm.

Parameter	Value	Unit
cylinder outer diameter	124	mm
cylinder inlet length	15	mm
rectangle internal length	250	mm
rectangle internal height	40	mm
rectangle inlet length	30	mm
offset Z	0	mm
offset Y	0	mm
total length	80	mm
thickness	5	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀52 mm to 80×30 mm, thickness 5 mm (📦 #10971)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀52 mm and a rectangular section with internal dimensions 80×30 mm. The wall thickness is 5 mm and the overall length is 80 mm.

Parameter	Value	Unit
cylinder outer diameter	52	mm
cylinder inlet length	25	mm
rectangle internal length	80	mm
rectangle internal height	30	mm
rectangle inlet length	30	mm
offset Z	0	mm
offset Y	0	mm
total length	80	mm
thickness	5	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀155 mm to 204×60 mm, thickness 4 mm + offset (📦 #10916)

1 object(s) - format STL

File in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀155 mm and a rectangular section with inner dimensions 204×60 mm. The wall thickness is 4 mm and the overall length is 175 mm. The adapter has an offset of 37.5 mm along the Z axis. A chamfer is present on the outside of the cylindrical end to ease insertion.

Parameter	Value	Unit
cylinder outer diameter	155	mm
cylinder inlet length	50	mm
rectangle internal length	204	mm
rectangle internal height	60	mm
rectangle inlet length	50	mm
offset Z	37.5	mm
offset Y	0	mm
total length	175	mm
thickness	4	mm
chamfer	chamfer on t...

Round-to-Rectangular Tube Adapter STL 3D file ⌀155 mm to 204×60 mm, thickness 4 mm (📦 #10915)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular adapter with an external diameter of ⌀155 mm and a rectangular section with internal dimensions 204×60 mm. The shell thickness is 4 mm and the overall length is 175 mm. A chamfer is applied on the outside of the cylindrical end.

Parameter	Value	Unit
cylinder outer diameter	155	mm
cylinder inlet length	50	mm
rectangle internal length	204	mm
rectangle internal height	60	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	175	mm
thickness	4	mm
chamfer	chamfer on t...

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.