Oval duct transition fitting / hose-shaped reducer 3D models

First model: 2025-12-03

Number of 3D models generated: 9

Category: technical parts

gizmo — Example of a 3D model generated using this template
(model #4216)

This template generates oval duct adapters, similar to hose-like connectors.

Depending on whether you print the fitting in a rigid material (PLA, PETG, ABS, ASA) or a flexible one (TPU, TPC), you’ll end up with different possible uses.

With more than ten parameters — including offsets along the Y and Z axes — this template can accommodate a wide range of situations. By setting the width just slightly greater than the height (example: width = 90.1, height = 90), you can create a near-circular tube on one side or both sides of the adapter.

You can also add internal or external chamfers to make assembly easier.

Most models print without supports.

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Keywords: oval transition fitting, oval duct fitting, oval adapter, oval duct adapter, oval transition, oval reducer, oval coupling, oval transition coupling, oval joint, oval end fitting, oval connector part, oval hose adapter, oval hose fitting, oval hose piece, ovoid fitting, ovoid adapter

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	name	unit	Value	Weight
#1	side A internal width 10 to 300 – up to 1 decimal place	mm
#2	side A internal height 10 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 10 to 300 – up to 1 decimal place	mm
#5	side B internal height 10 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

Oval duct transition adapter STL file 80.1x80 mm to 80x40 mm – transition: 20 mm (📦 #4270)

1 object(s) - format STL

STL 3D file for an oval hose fitting. On side A, the internal cross-section is 80.1x80 mm (nearly circular), whereas on side B it is 80x40 mm (oval). The sleeve on side A provides a useful length of 5 mm, and on side B 10 mm. The transition section is 20 mm long, for a final overall length of 35 mm. The wall is on the thicker side at 4 mm. External chamfers at the ends help with engagement and assembly within the duct system.

Parameter	Value	Unit
side A internal width	80.1	mm
side A internal height	80	mm
sleeve length on side A	5	mm
side B internal width	80	mm
side B internal height	40	mm
sleeve length on side B	10	mm
thickness	4	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	outside

Oval hose adapter STL 3D file 140x40 mm to 130x35 mm – transition: 40 mm (📦 #4268)

1 object(s) - format STL

Oval connector available as a STL 3D file. On side A, the internal cross-section is 140x40 mm, whereas on side B it is 130x35 mm. The useful sleeve length on side A is 8 mm, while on side B it reaches 6 mm. The transition section between the two ends is 40 mm long, for an overall length of 54 mm (sleeve A, transition and sleeve B). The internal edges at the ends are chamfered to help guide the duct during insertion.

Parameter	Value	Unit
side A internal width	140	mm
side A internal height	40	mm
sleeve length on side A	8	mm
side B internal width	130	mm
side B internal height	35	mm
sleeve length on side B	6	mm
thickness	2	mm
transition length	40	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Oval duct transition adapter STL 3D file 140x40 mm to 130x35 mm – transition: 20 mm (📦 #4267)

1 object(s) - format STL

Oval hose fitting available as a STL 3D file. On side A, the internal cross-section is 140x40 mm, whereas on side B it is 130x35 mm. On side A, the sleeve is 8 mm long, and on side B 6 mm. The transition portion extends over 20 mm and the overall length, sleeves included, is 34 mm. Internal chamfers at the ends improve assembly and make insertion smoother.

Parameter	Value	Unit
side A internal width	140	mm
side A internal height	40	mm
sleeve length on side A	8	mm
side B internal width	130	mm
side B internal height	35	mm
sleeve length on side B	6	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Oval hose adapter STL file 60x20 mm to 60x20 mm – transition: 140 mm (📦 #4259)

1 object(s) - format STL

Oval duct coupling provided as a STL 3D file. The internal cross-sections on sides A and B are identical, 60x20 mm. The useful length is consistent on both ends: 15 mm. The central transition occupies 140 mm, bringing the overall length to 170 mm. The ends are left without chamfers, with raw inner and outer edges. Side B is offset by 40 mm along the Y axis and 70 mm along the Z axis relative to side A.

Parameter	Value	Unit
side A internal width	60	mm
side A internal height	20	mm
sleeve length on side A	15	mm
side B internal width	60	mm
side B internal height	20	mm
sleeve length on side B	15	mm
thickness	2	mm
transition length	140	mm
Y offset	40	mm
Z offset	70	mm
end chamfers	none

Oval hose adapter STL 3D file 79x33 mm to 46x45 mm – transition: 20 mm (📦 #4245)

1 object(s) - format STL

Oval duct coupling provided as a STL 3D file. The internal cross-section on side A is 79x33 mm (oval), while on side B it is 46x45 mm (nearly circular). The useful sleeve length is the same on both sides, 10 mm. Between the two sleeves, the transition runs over 20 mm, resulting in an overall length of 40 mm. Both the inner and outer edges at the ends remain unchamfered.

Parameter	Value	Unit
side A internal width	79	mm
side A internal height	33	mm
sleeve length on side A	10	mm
side B internal width	46	mm
side B internal height	45	mm
sleeve length on side B	10	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval duct transition fitting STL 3D file 80x30 mm to 50x15 mm – transition: 40 mm (📦 #4239)

1 object(s) - format STL

Oval adapter available as a STL 3D file. The internal cross-section on side A is 80x30 mm, while on side B it is 50x15 mm. The useful lengths are 20 mm (A) and 100 mm (B), respectively. The transition section between the two ends is 40 mm long, for an overall length of 160 mm (sleeve A, transition and sleeve B). A thickness of 4 mm provides good stiffness. Both the inner and outer edges at the ends remain unchamfered. Compared to side A, side B is shifted by 20 mm along the Y axis.

Parameter	Value	Unit
side A internal width	80	mm
side A internal height	30	mm
sleeve length on side A	20	mm
side B internal width	50	mm
side B internal height	15	mm
sleeve length on side B	100	mm
thickness	4	mm
transition length	40	mm
Y offset	20	mm
Z offset	0	mm
end chamfers	none

Oval duct transition adapter STL file 60x20 mm to 60x20 mm – transition: 140 mm (📦 #4236)

1 object(s) - format STL

STL 3D file for an oval duct transition adapter. The internal cross-sections on sides A and B are identical, 60x20 mm. The useful length is consistent on both ends: 15 mm. Between the two sleeves, the transition runs over 140 mm, resulting in an overall length of 170 mm. Both the inner and outer edges at the ends remain unchamfered. An offset of 40 mm along the Y axis and 70 mm along the Z axis is applied to side B relative to side A.

Parameter	Value	Unit
side A internal width	60	mm
side A internal height	20	mm
sleeve length on side A	15	mm
side B internal width	60	mm
side B internal height	20	mm
sleeve length on side B	15	mm
thickness	3	mm
transition length	140	mm
Y offset	40	mm
Z offset	70	mm
end chamfers	none

Oval duct transition adapter STL file 120x80 mm to 90x70 mm – transition: 30 mm (📦 #4220)

1 object(s) - format STL

Oval duct fitting in STL 3D file format. Side A offers an internal cross-section of 120x80 mm and side B 90x70 mm. The useful sleeve length is the same on both sides, 20 mm. The transition portion extends over 30 mm and the overall length, sleeves included, is 70 mm. The ends are left without chamfers, with raw inner and outer edges.

Parameter	Value	Unit
side A internal width	120	mm
side A internal height	80	mm
sleeve length on side A	20	mm
side B internal width	90	mm
side B internal height	70	mm
sleeve length on side B	20	mm
thickness	3	mm
transition length	30	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Hose-shaped reducer STL 3D file 90.1x90 mm to 100x40 mm – transition: 100 mm (📦 #4216)

1 object(s) - format STL

STL 3D file for an oval coupling. The internal cross-section on side A is 90.1x90 mm (nearly circular), while on side B it is 100x40 mm (oval). On side A, the sleeve is 50 mm long, and on side B 20 mm. The transition section is 100 mm long, for a final overall length of 170 mm. The ends are straight, with no chamfer at all. 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	90.1	mm
side A internal height	90	mm
sleeve length on side A	50	mm
side B internal width	100	mm
side B internal height	40	mm
sleeve length on side B	20	mm
thickness	3	mm
transition length	100	mm
Y offset	30	mm
Z offset	30	mm
end chamfers	none