Rectangular-to-rectangular duct adapter 3D models

First model: 2025-11-25

Number of 3D models generated: 7

Category: technical parts

gizmo — Example of a 3D model generated using this template
(model #3644)

Photos of various 3D printed models

rectangular-to-rectangular duct adapter — #3771

This template generates rectangular-to-rectangular duct adapters. For each side, the length, height, and sleeve depth of the connector can be adjusted.

To fit a wide range of setups, the length of the transition between both sleeves is also adjustable, as well as the shell thickness and the optional chamfer at the ends to ease insertion.

Finally, you can apply an offset along the Y and Z axes.

Keywords: rectangular duct adapter, rectangular sleeve, rectangular duct sleeve, rectangular fitting, rectangular duct fitting

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	name	unit	Value	Weight
#1	side A internal width 20 to 300 – up to 1 decimal place	mm
#2	side A internal height 20 to 300 – up to 1 decimal place	mm
#3	sleeve length on side A 5 to 100 – up to 1 decimal place	mm
#4	side B internal width 20 to 300 – up to 1 decimal place	mm
#5	side B internal height 20 to 300 – up to 1 decimal place	mm
#6	sleeve length on side B 5 to 100 – up to 1 decimal place	mm
#7	thickness 1 to 8 - integer	mm
#8	transition length 20 to 300 – up to 1 decimal place	mm
#9	Y offset 0 to 300 – up to 1 decimal place	mm
#10	Z offset 0 to 300 – up to 1 decimal place	mm
#11	end chamfers		-	-

Illustration of the parameters

The latest online-generated models

Rectangular duct adapter STL 3D file 100x20 mm to 80x20 mm – transition: 20 mm (📦 #3876)

1 object(s) - format STL

Rectangular duct connector downloadable as STL 3D file. Side A uses an internal cross-section of 100x20 mm (rectangular), whereas side B is 80x20 mm (rectangular). Each sleeve provides an insertion length of 20 mm. The transition section between the two sides is 20 mm long, for an overall length of 60 mm (side A sleeve, transition and side B sleeve). Inner and outer edges at both ends are left unchamfered.

Parameter	Value	Unit
side A internal width	100	mm
side A internal height	20	mm
sleeve length on side A	20	mm
side B internal width	80	mm
side B internal height	20	mm
sleeve length on side B	20	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Rectangular pipe adapter STL 3D file 60x60 mm to 80x80 mm – transition: 180 mm (📦 #3872)

1 object(s) - format STL

Rectangular conduit adapter exported as STL 3D file. The internal cross-section on side A is 60x60 mm (square), while side B is 80x80 mm (square). The sleeve insertion length is the same on both sides, 10 mm. The transition section between the two sides is 180 mm long, for an overall length of 200 mm (side A sleeve, transition and side B sleeve). The wall is thin, with a thickness of 1 mm. No chamfers are applied at the ends; both inner and outer edges remain sharp.

Parameter	Value	Unit
side A internal width	60	mm
side A internal height	60	mm
sleeve length on side A	10	mm
side B internal width	80	mm
side B internal height	80	mm
sleeve length on side B	10	mm
thickness	1	mm
transition length	180	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Rectangular duct adapter STL 3D file 200x90 mm to 80x80 mm – transition: 60 mm (📦 #3870)

1 object(s) - format STL

Rectangular duct sleeve downloadable as STL 3D file. The internal cross-section on side A is 200x90 mm (rectangular), while side B is 80x80 mm (square). The insertion length on side A is 40 mm, while on side B it is 30 mm. Between the two sleeves, the transition section adds 60 mm, giving an overall length of 130 mm. Wall thickness is generous (4 mm). The ends are left without chamfers, with sharp inner and outer edges.

Parameter	Value	Unit
side A internal width	200	mm
side A internal height	90	mm
sleeve length on side A	40	mm
side B internal width	80	mm
side B internal height	80	mm
sleeve length on side B	30	mm
thickness	4	mm
transition length	60	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Rectangle-to-rectangle duct adapter STL 3D file 90x90 mm to 200x90 mm – transition: 100 mm (📦 #3788)

1 object(s) - format STL

Rectangular tube adapter exported as STL 3D file. Side A uses an internal cross-section of 90x90 mm (square), whereas side B is 200x90 mm (rectangular). The sleeve insertion length is the same on both sides, 40 mm. The transition section between the two sides is 100 mm long, for an overall length of 180 mm (side A sleeve, transition and side B sleeve). The shell is very thick, with 6 mm wall thickness. The internal edges at the ends are chamfered to help guide the duct during insertion. Side B is offset by 50 mm along the Y axis relative to side A.

Parameter	Value	Unit
side A internal width	90	mm
side A internal height	90	mm
sleeve length on side A	40	mm
side B internal width	200	mm
side B internal height	90	mm
sleeve length on side B	40	mm
thickness	6	mm
transition length	100	mm
Y offset	50	mm
Z offset	0	mm
end chamfers	inside

Rectangular tube adapter STL file 100x40 mm to 80x80 mm – transition: 80 mm (📦 #3771)

1 object(s) - format STL

Rectangular duct fitting exported as STL 3D file. Side A offers an internal cross-section of 100x40 mm (rectangular) and side B uses 80x80 mm (square). The sleeve insertion length is the same on both sides, 30 mm. The transition section runs for 80 mm and the overall length is 140 mm, sleeves included. Inner and outer edges at both ends are left unchamfered. Side B is offset by 30 mm along the Y axis and 30 mm along the Z axis relative to side A.

Parameter	Value	Unit
side A internal width	100	mm
side A internal height	40	mm
sleeve length on side A	30	mm
side B internal width	80	mm
side B internal height	80	mm
sleeve length on side B	30	mm
thickness	3	mm
transition length	80	mm
Y offset	30	mm
Z offset	30	mm
end chamfers	none

Rectangular pipe adapter STL 3D file 60x60 mm to 60x60 mm – transition: 60 mm (📦 #3738)

1 object(s) - format STL

Rectangular duct transition downloadable as STL 3D file. Both ends have the same internal cross-section, 60x60 mm, with a square shape. The sleeve insertion length is the same on both sides, 20 mm. The transition section runs for 60 mm and the overall length is 100 mm, sleeves included. The shell is thick, with a wall thickness of 4 mm. No chamfers are applied at the ends; both inner and outer edges remain sharp. An offset of 30 mm along the Y axis is applied to side B with respect to side A.

Parameter	Value	Unit
side A internal width	60	mm
side A internal height	60	mm
sleeve length on side A	20	mm
side B internal width	60	mm
side B internal height	60	mm
sleeve length on side B	20	mm
thickness	4	mm
transition length	60	mm
Y offset	30	mm
Z offset	0	mm
end chamfers	none

Rectangular pipe adapter STL 3D file 110x110 mm to 80x80 mm – transition: 20 mm (📦 #3644)

1 object(s) - format STL

Rectangular tube adapter downloadable as STL 3D file. Side A uses an internal cross-section of 110x110 mm (square), whereas side B is 80x80 mm (square). Both side A and side B sleeves share the same insertion length of 30 mm. The transition section runs for 20 mm and the overall length is 80 mm, sleeves included. The internal edges at the ends are chamfered to help guide the duct during insertion.

Parameter	Value	Unit
side A internal width	110	mm
side A internal height	110	mm
sleeve length on side A	30	mm
side B internal width	80	mm
side B internal height	80	mm
sleeve length on side B	30	mm
thickness	3	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside