Round to rectangular adapter 3D models

First model: 2025-08-30

Number of 3D models generated: 272

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

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

Latest models generated

Round-to-Rectangular Tube Adapter STL 3D file ⌀94 mm to 45.5×45.5 mm, thickness 2 mm + offset (📦 #2802)

1 object(s) - format STL

Download this 3D model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀94 mm and a rectangular section with inner dimensions 45.5×45.5 mm. The shell thickness is 2 mm and the total length is 95 mm. The adapter has an offset of 10 mm along the Y axis and 10 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	94	mm
cylinder inlet length	20	mm
rectangle internal length	45.5	mm
rectangle internal height	45.5	mm
rectangle inlet length	20	mm
offset Z	10	mm
offset Y	10	mm
total length	95	mm
thickness	2	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀65 mm to 47×23 mm, thickness 2 mm (📦 #2800)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular adapter with an external diameter of ⌀65 mm and a rectangular section with inner dimensions 47×23 mm. The wall thickness is 2 mm and the total length is 50 mm.

Parameter	Value	Unit
cylinder outer diameter	65	mm
cylinder inlet length	24	mm
rectangle internal length	47	mm
rectangle internal height	23	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 file ⌀125 mm to 220×90 mm, thickness 3 mm + offset (📦 #2698)

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 inner dimensions 220×90 mm. The wall thickness is 3 mm and the overall length is 200 mm. The adapter has an offset of 60 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	125	mm
cylinder inlet length	30	mm
rectangle internal length	220	mm
rectangle internal height	90	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 file ⌀150 mm to 200×115 mm, thickness 4 mm (📦 #2682)

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 internal dimensions 200×115 mm. The shell thickness is 4 mm and the total length is 200 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	150	mm
cylinder inlet length	50	mm
rectangle internal length	200	mm
rectangle internal height	115	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	200	mm
thickness	4	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL 3D file ⌀125 mm to 220×90 mm, thickness 3 mm (📦 #2671)

1 object(s) - format STL

Download this 3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀125 mm and a rectangular section with inner dimensions 220×90 mm. The shell thickness is 3 mm and the total length is 200 mm.

Parameter	Value	Unit
cylinder outer diameter	125	mm
cylinder inlet length	30	mm
rectangle internal length	220	mm
rectangle internal height	90	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 file ⌀81 mm to 120×70 mm, thickness 2 mm (📦 #2668)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀81 mm and a rectangular section with internal dimensions 120×70 mm. The wall thickness is 2 mm and the total length is 110 mm.

Parameter	Value	Unit
cylinder outer diameter	81	mm
cylinder inlet length	10	mm
rectangle internal length	120	mm
rectangle internal height	70	mm
rectangle inlet length	5	mm
offset Z	0	mm
offset Y	0	mm
total length	110	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀100 mm to 119×68 mm, thickness 2 mm (📦 #2603)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀100 mm and a rectangular section with inner dimensions 119×68 mm. The shell thickness is 2 mm and the overall length is 76 mm.

Parameter	Value	Unit
cylinder outer diameter	100	mm
cylinder inlet length	20	mm
rectangle internal length	119	mm
rectangle internal height	68	mm
rectangle inlet length	20	mm
offset Z	0	mm
offset Y	0	mm
total length	76	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀78 mm to 43×82 mm, thickness 2 mm (📦 #2601)

1 object(s) - format STL

Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀78 mm and a rectangular section with inner dimensions 43×82 mm. The wall thickness is 2 mm and the total length is 100 mm. A chamfer is present on the inside of the rectangular end.

Parameter	Value	Unit
cylinder outer diameter	78	mm
cylinder inlet length	30	mm
rectangle internal length	43	mm
rectangle internal height	82	mm
rectangle inlet length	50	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 ⌀100 mm to 119×72 mm, thickness 2 mm (📦 #2600)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an outer diameter of ⌀100 mm and a rectangular section with inner dimensions 119×72 mm. The wall thickness is 2 mm and the overall length is 76 mm.

Parameter	Value	Unit
cylinder outer diameter	100	mm
cylinder inlet length	20	mm
rectangle internal length	119	mm
rectangle internal height	72	mm
rectangle inlet length	20	mm
offset Z	0	mm
offset Y	0	mm
total length	76	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀78 mm to 62×82 mm, thickness 2 mm (📦 #2599)

1 object(s) - format STL

Download this 3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀78 mm and a rectangular section with inner dimensions 62×82 mm. The wall thickness is 2 mm and the total length is 100 mm. A chamfer is applied on the inside of the rectangular end.

Parameter	Value	Unit
cylinder outer diameter	78	mm
cylinder inlet length	30	mm
rectangle internal length	62	mm
rectangle internal height	82	mm
rectangle inlet length	50	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 ⌀58 mm to 62×82 mm, thickness 2 mm (📦 #2596)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀58 mm and a rectangular section with inner dimensions 62×82 mm. The wall thickness is 2 mm and the total length is 100 mm. A chamfer is present on the inside of the rectangular end.

Parameter	Value	Unit
cylinder outer diameter	58	mm
cylinder inlet length	30	mm
rectangle internal length	62	mm
rectangle internal height	82	mm
rectangle inlet length	50	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 ⌀65 mm to 62×82 mm, thickness 2 mm (📦 #2595)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀65 mm and a rectangular section with inner dimensions 62×82 mm. The shell thickness is 2 mm and the overall length is 100 mm. A chamfer is present on the inside of the rectangular end.

Parameter	Value	Unit
cylinder outer diameter	65	mm
cylinder inlet length	30	mm
rectangle internal length	62	mm
rectangle internal height	82	mm
rectangle inlet length	50	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 ⌀127 mm to 123×72 mm, thickness 2 mm (📦 #2593)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀127 mm and a rectangular section with inner dimensions 123×72 mm. The shell thickness is 2 mm and the total length is 76 mm.

Parameter	Value	Unit
cylinder outer diameter	127	mm
cylinder inlet length	20	mm
rectangle internal length	123	mm
rectangle internal height	72	mm
rectangle inlet length	20	mm
offset Z	0	mm
offset Y	0	mm
total length	76	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀124 mm to 156×176 mm, thickness 2 mm + offset (📦 #2590)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀124 mm and a rectangular section with internal dimensions 156×176 mm. The shell thickness is 2 mm and the overall length is 50 mm. The adapter has an offset of 20 mm along the Y axis and 20 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	124	mm
cylinder inlet length	5	mm
rectangle internal length	156	mm
rectangle internal height	176	mm
rectangle inlet length	5	mm
offset Z	20	mm
offset Y	20	mm
total length	50	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀76 mm to 160×78 mm, thickness 3 mm (📦 #2582)

1 object(s) - format STL

Download this model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀76 mm and a rectangular section with inner dimensions 160×78 mm. The wall thickness is 3 mm and the overall length is 200 mm.

Parameter	Value	Unit
cylinder outer diameter	76	mm
cylinder inlet length	76	mm
rectangle internal length	160	mm
rectangle internal height	78	mm
rectangle inlet length	100	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 ⌀158 mm to 190×110 mm, thickness 4 mm (📦 #2532)

1 object(s) - format STL

3D model in STL format of a round-to-rectangular adapter with an external diameter of ⌀158 mm and a rectangular section with internal dimensions 190×110 mm. The wall thickness is 4 mm and the overall length is 118.4 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	158	mm
cylinder inlet length	43	mm
rectangle internal length	190	mm
rectangle internal height	110	mm
rectangle inlet length	50	mm
offset Z	0	mm
offset Y	0	mm
total length	118.4	mm
thickness	4	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀158 mm to 210×180 mm, thickness 4 mm (📦 #2531)

1 object(s) - format STL

3D file in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀158 mm and a rectangular section with internal dimensions 210×180 mm. The shell thickness is 4 mm and the overall length is 83 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	158	mm
cylinder inlet length	35	mm
rectangle internal length	210	mm
rectangle internal height	180	mm
rectangle inlet length	20	mm
offset Z	0	mm
offset Y	0	mm
total length	83	mm
thickness	4	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀158 mm to 210×35 mm, thickness 4 mm (📦 #2530)

1 object(s) - format STL

Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀158 mm and a rectangular section with inner dimensions 210×35 mm. The shell thickness is 4 mm and the total length is 220 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	158	mm
cylinder inlet length	40	mm
rectangle internal length	210	mm
rectangle internal height	35	mm
rectangle inlet length	15	mm
offset Z	0	mm
offset Y	0	mm
total length	220	mm
thickness	4	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL 3D file ⌀150 mm to 150×50 mm, thickness 4 mm (📦 #2515)

1 object(s) - format STL

Download this 3D model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀150 mm and a rectangular section with internal dimensions 150×50 mm. The shell thickness is 4 mm and the overall length is 100 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	150	mm
cylinder inlet length	30	mm
rectangle internal length	150	mm
rectangle internal height	50	mm
rectangle inlet length	30	mm
offset Z	0	mm
offset Y	0	mm
total length	100	mm
thickness	4	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL 3D file ⌀27 mm to 33×30 mm, thickness 2 mm (📦 #2477)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular adapter with an external diameter of ⌀27 mm and a rectangular section with internal dimensions 33×30 mm. The wall thickness is 2 mm and the overall length is 115 mm.

Parameter	Value	Unit
cylinder outer diameter	27	mm
cylinder inlet length	20	mm
rectangle internal length	33	mm
rectangle internal height	30	mm
rectangle inlet length	75	mm
offset Z	0	mm
offset Y	0	mm
total length	115	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀33.5 mm to 25×34 mm, thickness 3 mm (📦 #2476)

1 object(s) - format STL

File in STL format of a round-to-rectangular adapter with an outer diameter of ⌀33.5 mm and a rectangular section with inner dimensions 25×34 mm. The shell thickness is 3 mm and the total length is 84 mm.

Parameter	Value	Unit
cylinder outer diameter	33.5	mm
cylinder inlet length	25	mm
rectangle internal length	25	mm
rectangle internal height	34	mm
rectangle inlet length	39	mm
offset Z	0	mm
offset Y	0	mm
total length	84	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀66 mm to 70×25 mm, thickness 3 mm + offset (📦 #2475)

1 object(s) - format STL

Download this file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀66 mm and a rectangular section with internal dimensions 70×25 mm. The shell thickness is 3 mm and the total length is 221.4 mm. The adapter has an offset of 10.7 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	66	mm
cylinder inlet length	50	mm
rectangle internal length	70	mm
rectangle internal height	25	mm
rectangle inlet length	100	mm
offset Z	10.7	mm
offset Y	0	mm
total length	221.4	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀66 mm to 70×25 mm, thickness 3 mm + offset (📦 #2474)

1 object(s) - format STL

Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀66 mm and a rectangular section with inner dimensions 70×25 mm. The shell thickness is 3 mm and the overall length is 300 mm. The adapter has an offset of 70 mm along the Z axis.

Parameter	Value	Unit
cylinder outer diameter	66	mm
cylinder inlet length	30	mm
rectangle internal length	70	mm
rectangle internal height	25	mm
rectangle inlet length	100	mm
offset Z	70	mm
offset Y	0	mm
total length	300	mm
thickness	3	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀78 mm to 128×30 mm, thickness 4 mm (📦 #2437)

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 128×30 mm. The shell thickness is 4 mm and the total length is 80 mm.

Parameter	Value	Unit
cylinder outer diameter	78	mm
cylinder inlet length	20	mm
rectangle internal length	128	mm
rectangle internal height	30	mm
rectangle inlet length	20	mm
offset Z	0	mm
offset Y	0	mm
total length	80	mm
thickness	4	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀140 mm to 80×80 mm, thickness 3 mm (📦 #2429)

1 object(s) - format STL

File in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀140 mm and a rectangular section with internal dimensions 80×80 mm. The wall thickness is 3 mm and the overall length is 80 mm.

Parameter	Value	Unit
cylinder outer diameter	140	mm
cylinder inlet length	30	mm
rectangle internal length	80	mm
rectangle internal height	80	mm
rectangle inlet length	30	mm
offset Z	0	mm
offset Y	0	mm
total length	80	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 (📦 #2417)

1 object(s) - format STL

Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀132 mm and a rectangular section with inner dimensions 114×58 mm. The wall thickness is 3 mm and the total length is 220 mm. The adapter has an offset of 35 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	132	mm
cylinder inlet length	50	mm
rectangle internal length	114	mm
rectangle internal height	58	mm
rectangle inlet length	99	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 3D file ⌀128 mm to 114×58 mm, thickness 3 mm (📦 #2416)

1 object(s) - format STL

3D model in STL format of a round-to-rectangular adapter with an external diameter of ⌀128 mm and a rectangular section with internal dimensions 114×58 mm. The shell thickness is 3 mm and the total 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	128	mm
cylinder inlet length	50	mm
rectangle internal length	114	mm
rectangle internal height	58	mm
rectangle inlet length	99	mm
offset Z	0	mm
offset Y	0	mm
total length	220	mm
thickness	3	mm
chamfer	chamfers on ...

Round-to-Rectangular Tube Adapter STL 3D file ⌀155 mm to 151×71 mm, thickness 2 mm (📦 #2375)

1 object(s) - format STL

Download this 3D file in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀155 mm and a rectangular section with inner dimensions 151×71 mm. The wall thickness is 2 mm and the total length is 100 mm.

Parameter	Value	Unit
cylinder outer diameter	155	mm
cylinder inlet length	25	mm
rectangle internal length	151	mm
rectangle internal height	71	mm
rectangle inlet length	25	mm
offset Z	0	mm
offset Y	0	mm
total length	100	mm
thickness	2	mm
chamfer	no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀90 mm to 76×76 mm, thickness 3 mm (📦 #2367)

1 object(s) - format STL

Model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀90 mm and a rectangular section with internal dimensions 76×76 mm. The wall thickness is 3 mm and the overall length is 120 mm.

Parameter	Value	Unit
cylinder outer diameter	90	mm
cylinder inlet length	50	mm
rectangle internal length	76	mm
rectangle internal height	76	mm
rectangle inlet length	50	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 ⌀25 mm to 125×25 mm, thickness 2 mm (📦 #2366)

1 object(s) - format STL

File in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀25 mm and a rectangular section with internal dimensions 125×25 mm. The wall thickness is 2 mm and the total length is 200 mm.

Parameter	Value	Unit
cylinder outer diameter	25	mm
cylinder inlet length	50	mm
rectangle internal length	125	mm
rectangle internal height	25	mm
rectangle inlet length	100	mm
offset Z	0	mm
offset Y	0	mm
total length	200	mm
thickness	2	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.