Custom Round-to-Rectangular Tube Adapter STL 3D file ⌀25 mm to 32×17 mm, thickness 3 mm 📦#11443

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Download this 3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀25 mm and a rectangular section with internal dimensions 32×17 mm. The wall thickness is 3 mm and the total length is 50 mm. A chamfer is applied on the inside of the rectangular end.
Generation date: 2026-09-05
3D Model Round-to-Rectangular Tube Adapter STL 3D file ⌀25 mm to 32×17 mm, thickness 3 mm

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  • round-to-rectangular-adapter-d_model11443-nb0_dd{id}.stl : 1 Mo
STL Mesh quality : Linear deflection 0.0005 Angular deflection 0.05
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(Internal and private use, non-commercial – no distribution – no derivatives)
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Values for this model

This model was generated by the Round to rectangular adapter template, with the following values:
Parameter Value
#1 cylinder outer diameter 25 mm (≃0.98 in)
#2 cylinder inlet length 20 mm (≃0.79 in)
#3 rectangle internal length 32 mm (≃1 1/4 in)
#4 rectangle internal height 17 mm (≃0.67 in)
#5 rectangle inlet length 10 mm (≃0.39 in)
#6 offset Z 0 mm (0 in)
#7 offset Y 0 mm (0 in)
#8 total length 50 mm (≃1.97 in)
#9 thickness 3 mm (≃1/8 in)
#10 chamfer chamfer on the inside
of the rectangular tube
Metadata Value
Cylinder internal diameter 19 mm (≃3/4 in)
illustration of the parameters
Parameter overview

  • 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.

Labels are used in the naming of the downloaded 3D files.

Parameter Label
#1 cylinder outer diameter diaC
#2 cylinder inlet length lentC
#3 rectangle internal length lenIR
#4 rectangle internal height heiIR
#5 rectangle inlet length lentR
#6 offset Z ofsZ
#7 offset Y ofsY
#8 total length lenT
#9 thickness thi
#10 chamfer cha

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To search for a model based on your own parameters, go to the template page Round to rectangular adapter 

Round-to-Rectangular Tube Adapter STL file ⌀20 mm to 20×10 mm, thickness 3 mm + offset (📦 #4816)

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Round-to-Rectangular Tube Adapter STL file ⌀20 mm to 20×10 mm, thickness 3 mm + offset
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Parameter Value Unit
cylinder outer diameter 20 mm
cylinder inlet length 20 mm
rectangle internal length 20 mm
rectangle internal height 10 mm
rectangle inlet length 10 mm
offset Z 3 mm
offset Y 1 mm
total length 50 mm
thickness 3 mm
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Round-to-Rectangular Tube Adapter STL file ⌀22 mm to 30.1×40 mm, thickness 3 mm (📦 #2934)

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Parameter Value Unit
cylinder outer diameter 22 mm
cylinder inlet length 20 mm
rectangle internal length 30.1 mm
rectangle internal height 40 mm
rectangle inlet length 6 mm
offset Z 0 mm
offset Y 0 mm
total length 50 mm
thickness 3 mm
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Round-to-Rectangular Tube Adapter STL file ⌀35 mm to 10×5 mm, thickness 3 mm (📦 #1981)

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Round-to-Rectangular Tube Adapter STL file ⌀35 mm to 10×5 mm, thickness 3 mm
File in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀35 mm and a rectangular section with inner dimensions 10×5 mm. The wall thickness is 3 mm and the total length is 50 mm. A chamfer is present on the outside of the cylindrical end to ease insertion.
Parameter Value Unit
cylinder outer diameter 35 mm
cylinder inlet length 5 mm
rectangle internal length 10 mm
rectangle internal height 5 mm
rectangle inlet length 5 mm
offset Z 0 mm
offset Y 0 mm
total length 50 mm
thickness 3 mm
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Round-to-Rectangular Tube Adapter STL 3D file ⌀70 mm to 60×35 mm, thickness 3 mm (📦 #4556)

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Round-to-Rectangular Tube Adapter STL 3D file ⌀70 mm to 60×35 mm, thickness 3 mm
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Parameter Value Unit
cylinder outer diameter 70 mm
cylinder inlet length 15 mm
rectangle internal length 60 mm
rectangle internal height 35 mm
rectangle inlet length 10 mm
offset Z 0 mm
offset Y 0 mm
total length 100 mm
thickness 3 mm
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Round-to-Rectangular Tube Adapter STL 3D file ⌀30 mm to 82.3×32.7 mm, thickness 3 mm (📦 #6218)

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Round-to-Rectangular Tube Adapter STL 3D file ⌀30 mm to 82.3×32.7 mm, thickness 3 mm
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Parameter Value Unit
cylinder outer diameter 30 mm
cylinder inlet length 25 mm
rectangle internal length 82.3 mm
rectangle internal height 32.7 mm
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total length 100 mm
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Round-to-Rectangular Tube Adapter STL 3D file ⌀21.9 mm to 80.2×80.2 mm, thickness 3 mm (📦 #2908)

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Round-to-Rectangular Tube Adapter STL 3D file ⌀21.9 mm to 80.2×80.2 mm, thickness 3 mm
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Parameter Value Unit
cylinder outer diameter 21.9 mm
cylinder inlet length 20 mm
rectangle internal length 80.2 mm
rectangle internal height 80.2 mm
rectangle inlet length 15 mm
offset Z 0 mm
offset Y 0 mm
total length 60 mm
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Round-to-Rectangular Tube Adapter STL file ⌀30 mm to 84.9×35 mm, thickness 3 mm (📦 #6214)

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Parameter Value Unit
cylinder outer diameter 30 mm
cylinder inlet length 25 mm
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Round-to-Rectangular Tube Adapter STL file ⌀35 mm to 84.9×35 mm, thickness 3 mm (📦 #6212)

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Parameter Value Unit
cylinder outer diameter 35 mm
cylinder inlet length 25 mm
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offset Y 0 mm
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Round-to-Rectangular Tube Adapter STL file ⌀32 mm to 55.1×20 mm, thickness 2 mm (📦 #1921)

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Round-to-Rectangular Tube Adapter STL file ⌀32 mm to 55.1×20 mm, thickness 2 mm
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Parameter Value Unit
cylinder outer diameter 32 mm
cylinder inlet length 15 mm
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Parameter Value Unit
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Parameter Value Unit
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cylinder inlet length 25 mm
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3D model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀20 mm and a rectangular section with inner dimensions 100×30 mm. The wall thickness is 3 mm and the overall length is 70 mm. The adapter has an offset of 5 mm along the Y axis and 5 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 20 mm
cylinder inlet length 20 mm
rectangle internal length 100 mm
rectangle internal height 30 mm
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Round-to-Rectangular Tube Adapter STL 3D file ⌀26 mm to 25×16 mm, thickness 3 mm (📦 #11405)

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Round-to-Rectangular Tube Adapter STL 3D file ⌀26 mm to 25×16 mm, thickness 3 mm
Download this 3D model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀26 mm and a rectangular section with internal dimensions 25×16 mm. The wall 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 26 mm
cylinder inlet length 35 mm
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Round-to-Rectangular Tube Adapter STL file ⌀39 mm to 43.5×12.5 mm, thickness 2 mm + offset (📦 #4978)

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Round-to-Rectangular Tube Adapter STL file ⌀39 mm to 43.5×12.5 mm, thickness 2 mm + offset
File in STL format of a round-to-rectangular adapter with an outer diameter of ⌀39 mm and a rectangular section with inner dimensions 43.5×12.5 mm. The wall thickness is 2 mm and the total length is 55 mm. The adapter has an offset of 5 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 39 mm
cylinder inlet length 15 mm
rectangle internal length 43.5 mm
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Round-to-Rectangular Tube Adapter STL 3D file ⌀39 mm to 45×13 mm, thickness 2 mm + offset (📦 #4969)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL 3D file ⌀39 mm to 45×13 mm, thickness 2 mm + offset
Download this file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀39 mm and a rectangular section with inner dimensions 45×13 mm. The shell thickness is 2 mm and the overall length is 55 mm. The adapter has an offset of 5 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 39 mm
cylinder inlet length 15 mm
rectangle internal length 45 mm
rectangle internal height 13 mm
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Round-to-Rectangular Tube Adapter STL 3D file ⌀20 mm to 21×16 mm, thickness 3 mm (📦 #3337)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL 3D file ⌀20 mm to 21×16 mm, thickness 3 mm
Model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀20 mm and a rectangular section with inner dimensions 21×16 mm. The wall thickness is 3 mm and the total length is 50 mm.
Parameter Value Unit
cylinder outer diameter 20 mm
cylinder inlet length 15 mm
rectangle internal length 21 mm
rectangle internal height 16 mm
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Round-to-Rectangular Tube Adapter STL file ⌀56 mm to 80×80 mm, thickness 3 mm (📦 #1845)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL file ⌀56 mm to 80×80 mm, thickness 3 mm
3D file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀56 mm and a rectangular section with internal dimensions 80×80 mm. The wall thickness is 3 mm and the overall length is 50 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 56 mm
cylinder inlet length 15 mm
rectangle internal length 80 mm
rectangle internal height 80 mm
rectangle inlet length 15 mm
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offset Y 0 mm
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thickness 3 mm
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Round-to-Rectangular Tube Adapter STL 3D file ⌀22 mm to 30×40 mm, thickness 3 mm (📦 #2914)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL 3D file ⌀22 mm to 30×40 mm, thickness 3 mm
Model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀22 mm and a rectangular section with inner dimensions 30×40 mm. The shell thickness is 3 mm and the total length is 60 mm.
Parameter Value Unit
cylinder outer diameter 22 mm
cylinder inlet length 20 mm
rectangle internal length 30 mm
rectangle internal height 40 mm
rectangle inlet length 10 mm
offset Z 0 mm
offset Y 0 mm
total length 60 mm
thickness 3 mm
chamfer no chamfer

Round-to-Rectangular Tube Adapter STL file ⌀34 mm to 39.7×29.2 mm, thickness 3 mm (📦 #10226)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL file ⌀34 mm to 39.7×29.2 mm, thickness 3 mm
File in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀34 mm and a rectangular section with inner dimensions 39.7×29.2 mm. The wall thickness is 3 mm and the overall length is 60 mm.
Parameter Value Unit
cylinder outer diameter 34 mm
cylinder inlet length 25 mm
rectangle internal length 39.7 mm
rectangle internal height 29.2 mm
rectangle inlet length 15 mm
offset Z 0 mm
offset Y 0 mm
total length 60 mm
thickness 3 mm
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Round-to-Rectangular Tube Adapter STL file ⌀32 mm to 35×20 mm, thickness 3 mm + offset (📦 #1618)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL file ⌀32 mm to 35×20 mm, thickness 3 mm + offset
Model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀32 mm and a rectangular section with inner dimensions 35×20 mm. The shell thickness is 3 mm and the overall length is 60 mm. The adapter has an offset of 2 mm along the Z axis.
Parameter Value Unit
cylinder outer diameter 32 mm
cylinder inlet length 15 mm
rectangle internal length 35 mm
rectangle internal height 20 mm
rectangle inlet length 20 mm
offset Z 2 mm
offset Y 0 mm
total length 60 mm
thickness 3 mm
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Round-to-Rectangular Tube Adapter STL file ⌀60 mm to 60×30 mm, thickness 2 mm (📦 #1508)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL file ⌀60 mm to 60×30 mm, thickness 2 mm
Download this file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀60 mm and a rectangular section with internal dimensions 60×30 mm. The wall thickness is 2 mm and the total length is 80 mm. A chamfer is present on the inside of the rectangular end.
Parameter Value Unit
cylinder outer diameter 60 mm
cylinder inlet length 10 mm
rectangle internal length 60 mm
rectangle internal height 30 mm
rectangle inlet length 5 mm
offset Z 0 mm
offset Y 0 mm
total length 80 mm
thickness 2 mm
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Round-to-Rectangular Tube Adapter STL file ⌀50 mm to 45×35 mm, thickness 2 mm (📦 #4489)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL file ⌀50 mm to 45×35 mm, thickness 2 mm
3D file in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀50 mm and a rectangular section with inner dimensions 45×35 mm. The wall thickness is 2 mm and the overall length is 50 mm. A chamfer is present on the outside of the cylindrical end.
Parameter Value Unit
cylinder outer diameter 50 mm
cylinder inlet length 10 mm
rectangle internal length 45 mm
rectangle internal height 35 mm
rectangle inlet length 7 mm
offset Z 0 mm
offset Y 0 mm
total length 50 mm
thickness 2 mm
chamfer chamfer on t...

Round-to-Rectangular Tube Adapter STL file ⌀80 mm to 76×76 mm, thickness 3 mm (📦 #5627)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL file ⌀80 mm to 76×76 mm, thickness 3 mm
3D file in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀80 mm and a rectangular section with internal dimensions 76×76 mm. The wall thickness is 3 mm and the total length is 50 mm. A chamfer is present on the inside of the rectangular end to ease insertion.
Parameter Value Unit
cylinder outer diameter 80 mm
cylinder inlet length 25 mm
rectangle internal length 76 mm
rectangle internal height 76 mm
rectangle inlet length 5 mm
offset Z 0 mm
offset Y 0 mm
total length 50 mm
thickness 3 mm
chamfer chamfer on t...

Round-to-Rectangular Tube Adapter STL file ⌀32 mm to 35×20 mm, thickness 3 mm + offset (📦 #1619)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL file ⌀32 mm to 35×20 mm, thickness 3 mm + offset
Download this model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀32 mm and a rectangular section with inner dimensions 35×20 mm. The wall thickness is 3 mm and the total length is 60 mm. The adapter has an offset of 5 mm along the Z axis.
Parameter Value Unit
cylinder outer diameter 32 mm
cylinder inlet length 15 mm
rectangle internal length 35 mm
rectangle internal height 20 mm
rectangle inlet length 20 mm
offset Z 5 mm
offset Y 0 mm
total length 60 mm
thickness 3 mm
chamfer no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀25 mm to 57×33 mm, thickness 2 mm (📦 #7108)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL 3D file ⌀25 mm to 57×33 mm, thickness 2 mm
Download this 3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀25 mm and a rectangular section with inner dimensions 57×33 mm. The wall thickness is 2 mm and the overall length is 75 mm. A chamfer is present on the outside of the cylindrical end.
Parameter Value Unit
cylinder outer diameter 25 mm
cylinder inlet length 30 mm
rectangle internal length 57 mm
rectangle internal height 33 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 75 mm
thickness 2 mm
chamfer chamfer on t...

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
Round-to-Rectangular Tube Adapter STL 3D file ⌀30 mm to 65.8×45.8 mm, thickness 2 mm
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 file ⌀63 mm to 80×80 mm, thickness 3 mm (📦 #2067)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL file ⌀63 mm to 80×80 mm, thickness 3 mm
Download this model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀63 mm and a rectangular section with internal dimensions 80×80 mm. The wall thickness is 3 mm and the overall length is 50 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 63 mm
cylinder inlet length 15 mm
rectangle internal length 80 mm
rectangle internal height 80 mm
rectangle inlet length 15 mm
offset Z 0 mm
offset Y 0 mm
total length 50 mm
thickness 3 mm
chamfer chamfers on ...

Round-to-Rectangular Tube Adapter STL file ⌀20 mm to 10×5 mm, thickness 3 mm (📦 #1486)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL file ⌀20 mm to 10×5 mm, thickness 3 mm
File in STL format of a round-to-rectangular adapter with an external diameter of ⌀20 mm and a rectangular section with inner dimensions 10×5 mm. The shell thickness is 3 mm and the overall length is 60 mm.
Parameter Value Unit
cylinder outer diameter 20 mm
cylinder inlet length 30 mm
rectangle internal length 10 mm
rectangle internal height 5 mm
rectangle inlet length 10 mm
offset Z 0 mm
offset Y 0 mm
total length 60 mm
thickness 3 mm
chamfer no chamfer

Round-to-Rectangular Tube Adapter STL 3D file ⌀52 mm to 50×41 mm, thickness 2 mm (📦 #4519)

1 object(s) - format STL
Round-to-Rectangular Tube Adapter STL 3D file ⌀52 mm to 50×41 mm, thickness 2 mm
Download this 3D 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 50×41 mm. The wall thickness is 2 mm and the overall length is 50 mm. A chamfer is applied on the outside of the cylindrical end.
Parameter Value Unit
cylinder outer diameter 52 mm
cylinder inlet length 10 mm
rectangle internal length 50 mm
rectangle internal height 41 mm
rectangle inlet length 7 mm
offset Z 0 mm
offset Y 0 mm
total length 50 mm
thickness 2 mm
chamfer chamfer on t...