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

First model: 2025-12-03

Number of 3D models generated: 93

Category: technical parts

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Photos of various 3D printed models

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		-	-
			Search

Illustration of the parameters

The latest online-generated models

Oval hose adapter STL file 190x165 mm to 135x35 mm – transition: 45 mm (📦 #9931)

1 object(s) - format STL

Oval connector available as a STL 3D file. On side A, the internal cross-section is 190x165 mm, whereas on side B it is 135x35 mm. The sleeves also differ in useful length: 30 mm on side A and 45 mm on side B. The transition links the two ends over 45 mm, with a total overall length of 120 mm. The shell is relatively thick, with a wall thickness of 5 mm. External chamfers are added at the ends to make it easier to insert the adapter into ducts or hoses.

Parameter	Value	Unit
side A internal width	190	mm
side A internal height	165	mm
sleeve length on side A	30	mm
side B internal width	135	mm
side B internal height	35	mm
sleeve length on side B	45	mm
thickness	5	mm
transition length	45	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	outside

Hose-shaped reducer STL file 88.9x34.9 mm to 46x45 mm – transition: 20 mm (📦 #9872)

1 object(s) - format STL

STL 3D file for an oval connector. On side A, the internal cross-section is 88.9x34.9 mm (oval), whereas on side B it is 46x45 mm (nearly circular). The useful length is consistent on both ends: 10 mm. The transition links the two ends over 20 mm, with a total overall length of 40 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.

Parameter	Value	Unit
side A internal width	88.9	mm
side A internal height	34.9	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	inside

Oval duct transition fitting STL file 50x20 mm to 35.6x35.5 mm – transition: 20 mm (📦 #9780)

1 object(s) - format STL

Oval duct adapter provided as a STL 3D file. Side A offers an internal cross-section of 50x20 mm (oval) and side B 35.6x35.5 mm (nearly circular). On side A, the sleeve is 20 mm long, and on side B 35 mm. The transition section between the two ends is 20 mm long, for an overall length of 75 mm (sleeve A, transition and sleeve B). The external chamfers improve fit when inserting the adapter into ducts or hoses.

Parameter	Value	Unit
side A internal width	50	mm
side A internal height	20	mm
sleeve length on side A	20	mm
side B internal width	35.6	mm
side B internal height	35.5	mm
sleeve length on side B	35	mm
thickness	3	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	outside

Hose-shaped reducer STL 3D file 140x139 mm to 250x20 mm – transition: 75 mm (📦 #9613)

1 object(s) - format STL

STL 3D file for an oval pipe adapter. The internal cross-section on side A is 140x139 mm (nearly circular), while on side B it is 250x20 mm (oval). On side A, the sleeve is 50 mm long, and on side B 100 mm. Between the two sleeves, the transition runs over 75 mm, resulting in an overall length of 225 mm. The ends are straight, with no chamfer at all.

Parameter	Value	Unit
side A internal width	140	mm
side A internal height	139	mm
sleeve length on side A	50	mm
side B internal width	250	mm
side B internal height	20	mm
sleeve length on side B	100	mm
thickness	3	mm
transition length	75	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Hose-shaped reducer STL file 145x144 mm to 250x20 mm – transition: 75 mm (📦 #9611)

1 object(s) - format STL

STL 3D file for an oval duct transition adapter. On side A, the internal cross-section is 145x144 mm (nearly circular), whereas on side B it is 250x20 mm (oval). On side A, the sleeve is 50 mm long, and on side B 100 mm. The transition section between the two ends is 75 mm long, for an overall length of 225 mm (sleeve A, transition and sleeve B). The shell is relatively thick, with a wall thickness of 4 mm. Both the inner and outer edges at the ends remain unchamfered.

Parameter	Value	Unit
side A internal width	145	mm
side A internal height	144	mm
sleeve length on side A	50	mm
side B internal width	250	mm
side B internal height	20	mm
sleeve length on side B	100	mm
thickness	4	mm
transition length	75	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval hose adapter STL file 145x144 mm to 250x20 mm – transition: 60 mm (📦 #9610)

1 object(s) - format STL

Oval adapter in STL 3D file format. Side A offers an internal cross-section of 145x144 mm (nearly circular) and side B 250x20 mm (oval). You get a sleeve of 70 mm on side A and 100 mm on side B. The central transition occupies 60 mm, bringing the overall length to 230 mm. A thickness of 4 mm provides good stiffness. The ends are straight, with no chamfer at all.

Parameter	Value	Unit
side A internal width	145	mm
side A internal height	144	mm
sleeve length on side A	70	mm
side B internal width	250	mm
side B internal height	20	mm
sleeve length on side B	100	mm
thickness	4	mm
transition length	60	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval duct transition fitting STL file 150x149 mm to 250x20 mm – transition: 40 mm (📦 #9609)

1 object(s) - format STL

Oval duct coupling available as a STL 3D file. The internal cross-section on side A is 150x149 mm (nearly circular), while on side B it is 250x20 mm (oval). The sleeves also differ in useful length: 50 mm on side A and 100 mm on side B. The transition section is 40 mm long, for a final overall length of 190 mm. With 4 mm of wall thickness, the adapter gains extra strength. The ends are left without chamfers, with raw inner and outer edges.

Parameter	Value	Unit
side A internal width	150	mm
side A internal height	149	mm
sleeve length on side A	50	mm
side B internal width	250	mm
side B internal height	20	mm
sleeve length on side B	100	mm
thickness	4	mm
transition length	40	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval hose adapter STL file 121x120.5 mm to 90x53 mm – transition: 63 mm (📦 #9581)

1 object(s) - format STL

Oval coupling in STL 3D file format. On side A, the internal cross-section is 121x120.5 mm (nearly circular), whereas on side B it is 90x53 mm (oval). The sleeve on side A provides a useful length of 25 mm, and on side B 30 mm. The transition section is 63 mm long, for a final overall length of 118 mm. Internal chamfers at the ends improve assembly and make insertion smoother. An offset of 31.5 mm along the Z axis is applied to side B relative to side A.

Parameter	Value	Unit
side A internal width	121	mm
side A internal height	120.5	mm
sleeve length on side A	25	mm
side B internal width	90	mm
side B internal height	53	mm
sleeve length on side B	30	mm
thickness	2	mm
transition length	63	mm
Y offset	0	mm
Z offset	31.5	mm
end chamfers	inside

Oval duct transition adapter STL 3D file 77x75 mm to 60x55 mm – transition: 50 mm (📦 #9178)

1 object(s) - format STL

Oval adapter available as a STL 3D file. The internal cross-section on side A is 77x75 mm (nearly circular), while on side B it is 60x55 mm (oval). The useful sleeve length on side A is 50 mm, while on side B it reaches 100 mm. Between the two sleeves, the transition runs over 50 mm, resulting in an overall length of 200 mm. The wall is on the thicker side at 4 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.

Parameter	Value	Unit
side A internal width	77	mm
side A internal height	75	mm
sleeve length on side A	50	mm
side B internal width	60	mm
side B internal height	55	mm
sleeve length on side B	100	mm
thickness	4	mm
transition length	50	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Oval duct transition adapter STL 3D file 66x65.9 mm to 107x51.5 mm – transition: 20 mm (📦 #8831)

1 object(s) - format STL

STL 3D file for an oval coupling. The internal cross-section on side A is 66x65.9 mm (nearly circular), while on side B it is 107x51.5 mm (oval). The sleeves on sides A and B have the same useful length of 80 mm. Between the two sleeves, the transition runs over 20 mm, resulting in an overall length of 180 mm. The wall is on the thicker side at 5 mm. The ends are straight, with no chamfer at all.

Parameter	Value	Unit
side A internal width	66	mm
side A internal height	65.9	mm
sleeve length on side A	80	mm
side B internal width	107	mm
side B internal height	51.5	mm
sleeve length on side B	80	mm
thickness	5	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval hose adapter STL file 100x15 mm to 50x28 mm – transition: 40 mm (📦 #8828)

1 object(s) - format STL

Oval pipe adapter available as a STL 3D file. On side A, the internal cross-section is 100x15 mm, whereas on side B it is 50x28 mm. The useful sleeve length is the same on both sides, 10 mm. The transition portion extends over 40 mm and the overall length, sleeves included, is 60 mm. The internal chamfers help start the duct insertion more easily.

Parameter	Value	Unit
side A internal width	100	mm
side A internal height	15	mm
sleeve length on side A	10	mm
side B internal width	50	mm
side B internal height	28	mm
sleeve length on side B	10	mm
thickness	2	mm
transition length	40	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Oval duct transition fitting STL file 105x35 mm to 105x34 mm – transition: 20 mm (📦 #8809)

1 object(s) - format STL

Oval hose adapter provided as a STL 3D file. On side A, the internal cross-section is 105x35 mm, whereas on side B it is 105x34 mm. The useful sleeve length is the same on both sides, 40 mm. The transition links the two ends over 20 mm, with a total overall length of 100 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier.

Parameter	Value	Unit
side A internal width	105	mm
side A internal height	35	mm
sleeve length on side A	40	mm
side B internal width	105	mm
side B internal height	34	mm
sleeve length on side B	40	mm
thickness	3	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Oval duct transition fitting STL 3D file 55x25 mm to 43x42 mm – transition: 20 mm (📦 #8548)

1 object(s) - format STL

Oval hose adapter in STL 3D file format. On side A, the internal cross-section is 55x25 mm (oval), whereas on side B it is 43x42 mm (nearly circular). The sleeve on side A provides a useful length of 50 mm, and on side B 30 mm. The central transition occupies 20 mm, bringing the overall length to 100 mm. The ends are left without chamfers, with raw inner and outer edges.

Parameter	Value	Unit
side A internal width	55	mm
side A internal height	25	mm
sleeve length on side A	50	mm
side B internal width	43	mm
side B internal height	42	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	none

Oval duct transition adapter STL file 35x17.2 mm to 30.6x30.5 mm – transition: 20 mm (📦 #8320)

1 object(s) - format STL

Oval adapter available as a STL 3D file. The internal cross-section on side A is 35x17.2 mm (oval), while on side B it is 30.6x30.5 mm (nearly circular). Both sleeves share an identical useful length of 8 mm. The transition section is 20 mm long, for a final overall length of 36 mm. The external edges at the ends are chamfered, which simplifies inserting the adapter into the duct.

Parameter	Value	Unit
side A internal width	35	mm
side A internal height	17.2	mm
sleeve length on side A	8	mm
side B internal width	30.6	mm
side B internal height	30.5	mm
sleeve length on side B	8	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	outside

Oval hose adapter STL 3D file 35x17.2 mm to 30x29.9 mm – transition: 20 mm (📦 #8319)

1 object(s) - format STL

Oval duct adapter available as a STL 3D file. On side A, the internal cross-section is 35x17.2 mm (oval), whereas on side B it is 30x29.9 mm (nearly circular). The useful length is consistent on both ends: 8 mm. The central transition occupies 20 mm, bringing the overall length to 36 mm. External chamfers are added at the ends to make it easier to insert the adapter into ducts or hoses.

Parameter	Value	Unit
side A internal width	35	mm
side A internal height	17.2	mm
sleeve length on side A	8	mm
side B internal width	30	mm
side B internal height	29.9	mm
sleeve length on side B	8	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	outside

Oval duct transition adapter STL file 102x74 mm to 83.5x83 mm – transition: 22 mm (📦 #8051)

1 object(s) - format STL

STL 3D file for an oval coupling. Side A offers an internal cross-section of 102x74 mm (oval) and side B 83.5x83 mm (nearly circular). The useful sleeve length on side A is 15 mm, while on side B it reaches 18 mm. The central transition occupies 22 mm, bringing the overall length to 55 mm. No chamfer is applied at the ends, so both the inner and outer edges remain sharp.

Parameter	Value	Unit
side A internal width	102	mm
side A internal height	74	mm
sleeve length on side A	15	mm
side B internal width	83.5	mm
side B internal height	83	mm
sleeve length on side B	18	mm
thickness	2	mm
transition length	22	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval duct transition adapter STL file 196x195.9 mm to 196x56 mm – transition: 60 mm (📦 #8009)

1 object(s) - format STL

Oval connector provided as a STL 3D file. On side A, the internal cross-section is 196x195.9 mm (nearly circular), whereas on side B it is 196x56 mm (oval). The useful lengths are 20 mm (A) and 40 mm (B), respectively. Between the two sleeves, the transition runs over 60 mm, resulting in an overall length of 120 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.

Parameter	Value	Unit
side A internal width	196	mm
side A internal height	195.9	mm
sleeve length on side A	20	mm
side B internal width	196	mm
side B internal height	56	mm
sleeve length on side B	40	mm
thickness	2	mm
transition length	60	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Oval duct transition fitting STL 3D file 102x74 mm to 83.5x83 mm – transition: 25 mm (📦 #7994)

1 object(s) - format STL

Oval duct coupling in STL 3D file format. Side A offers an internal cross-section of 102x74 mm (oval) and side B 83.5x83 mm (nearly circular). You get a sleeve of 15 mm on side A and 20 mm on side B. The transition section is 25 mm long, for a final overall length of 60 mm. Both the inner and outer edges at the ends remain unchamfered.

Parameter	Value	Unit
side A internal width	102	mm
side A internal height	74	mm
sleeve length on side A	15	mm
side B internal width	83.5	mm
side B internal height	83	mm
sleeve length on side B	20	mm
thickness	2	mm
transition length	25	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval hose adapter STL 3D file 106x52 mm to 72x71 mm – transition: 25 mm (📦 #7987)

1 object(s) - format STL

Oval duct fitting in STL 3D file format. On side A, the internal cross-section is 106x52 mm (oval), whereas on side B it is 72x71 mm (nearly circular). The sleeve on side A provides a useful length of 15 mm, and on side B 20 mm. The transition section is 25 mm long, for a final overall length of 60 mm. Wall thickness is generous (4 mm). The ends are straight, with no chamfer at all.

Parameter	Value	Unit
side A internal width	106	mm
side A internal height	52	mm
sleeve length on side A	15	mm
side B internal width	72	mm
side B internal height	71	mm
sleeve length on side B	20	mm
thickness	4	mm
transition length	25	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval hose adapter STL 3D file 22.9x11.5 mm to 22.9x11.5 mm – transition: 20 mm (📦 #7959)

1 object(s) - format STL

Oval connector provided as a STL 3D file. On both sides A and B, the internal cross-section is the same: 22.9x11.5 mm. Both sleeves share an identical useful length of 5 mm. The transition portion extends over 20 mm and the overall length, sleeves included, is 30 mm. The shell stays very lightweight, with only 1 mm of wall thickness. Internal chamfers at the ends improve assembly and make insertion smoother.

Parameter	Value	Unit
side A internal width	22.9	mm
side A internal height	11.5	mm
sleeve length on side A	5	mm
side B internal width	22.9	mm
side B internal height	11.5	mm
sleeve length on side B	5	mm
thickness	1	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Oval duct transition fitting STL file 106x52 mm to 72x71 mm – transition: 32 mm (📦 #7890)

1 object(s) - format STL

Oval coupling available as a STL 3D file. The internal cross-section on side A is 106x52 mm (oval), while on side B it is 72x71 mm (nearly circular). The sleeve on side A provides a useful length of 20 mm, and on side B 25 mm. The transition section is 32 mm long, for a final overall length of 77 mm. With 4 mm of wall thickness, the adapter gains extra strength. The ends are straight, with no chamfer at all.

Parameter	Value	Unit
side A internal width	106	mm
side A internal height	52	mm
sleeve length on side A	20	mm
side B internal width	72	mm
side B internal height	71	mm
sleeve length on side B	25	mm
thickness	4	mm
transition length	32	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval hose adapter STL file 102x74 mm to 72x71 mm – transition: 32 mm (📦 #7889)

1 object(s) - format STL

Oval connector available as a STL 3D file. On side A, the internal cross-section is 102x74 mm (oval), whereas on side B it is 72x71 mm (nearly circular). You get a sleeve of 20 mm on side A and 25 mm on side B. The transition section between the two ends is 32 mm long, for an overall length of 77 mm (sleeve A, transition and sleeve B). The shell is relatively thick, with a wall thickness of 4 mm. The ends are straight, with no chamfer at all.

Parameter	Value	Unit
side A internal width	102	mm
side A internal height	74	mm
sleeve length on side A	20	mm
side B internal width	72	mm
side B internal height	71	mm
sleeve length on side B	25	mm
thickness	4	mm
transition length	32	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Hose-shaped reducer STL file 106x52 mm to 72x71 mm – transition: 32 mm (📦 #7860)

1 object(s) - format STL

Oval pipe adapter in STL 3D file format. Side A offers an internal cross-section of 106x52 mm (oval) and side B 72x71 mm (nearly circular). The sleeve on side A provides a useful length of 35 mm, and on side B 25 mm. The central transition occupies 32 mm, bringing the overall length to 92 mm. Both the inner and outer edges at the ends remain unchamfered.

Parameter	Value	Unit
side A internal width	106	mm
side A internal height	52	mm
sleeve length on side A	35	mm
side B internal width	72	mm
side B internal height	71	mm
sleeve length on side B	25	mm
thickness	2	mm
transition length	32	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval duct transition fitting STL file 22.9x11.6 mm to 18x17.9 mm – transition: 40 mm (📦 #7787)

1 object(s) - format STL

STL 3D file for an oval hose fitting. The internal cross-section on side A is 22.9x11.6 mm (oval), while on side B it is 18x17.9 mm (nearly circular). The useful sleeve length on side A is 20 mm, while on side B it reaches 10 mm. The central transition occupies 40 mm, bringing the overall length to 70 mm. With 1 mm of thickness, the wall remains flexible and material-efficient. Internal chamfers are added at the ends to make assembly and duct insertion easier. An offset of 8.7 mm along the Z axis is applied to side B relative to side A.

Parameter	Value	Unit
side A internal width	22.9	mm
side A internal height	11.6	mm
sleeve length on side A	20	mm
side B internal width	18	mm
side B internal height	17.9	mm
sleeve length on side B	10	mm
thickness	1	mm
transition length	40	mm
Y offset	0	mm
Z offset	8.7	mm
end chamfers	inside

Oval duct transition fitting STL 3D file 23.1x11.7 mm to 19x18.9 mm – transition: 40 mm (📦 #7779)

1 object(s) - format STL

STL 3D file for an oval connector. Side A offers an internal cross-section of 23.1x11.7 mm (oval) and side B 19x18.9 mm (nearly circular). The sleeve on side A provides a useful length of 20 mm, and on side B 15 mm. The transition links the two ends over 40 mm, with a total overall length of 75 mm. Wall thickness is minimal at 1 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier. An offset of 8.8 mm along the Z axis is applied to side B relative to side A.

Parameter	Value	Unit
side A internal width	23.1	mm
side A internal height	11.7	mm
sleeve length on side A	20	mm
side B internal width	19	mm
side B internal height	18.9	mm
sleeve length on side B	15	mm
thickness	1	mm
transition length	40	mm
Y offset	0	mm
Z offset	8.8	mm
end chamfers	inside

Oval hose adapter STL file 30.7x30.6 mm to 30.7x12 mm – transition: 20 mm (📦 #7614)

1 object(s) - format STL

Oval coupling in STL 3D file format. The internal cross-section on side A is 30.7x30.6 mm (nearly circular), while on side B it is 30.7x12 mm (oval). The useful length is consistent on both ends: 20 mm. The central transition occupies 20 mm, bringing the overall length to 60 mm. The ends are straight, with no chamfer at all. Compared to side A, side B is shifted by 10 mm along the Z axis.

Parameter	Value	Unit
side A internal width	30.7	mm
side A internal height	30.6	mm
sleeve length on side A	20	mm
side B internal width	30.7	mm
side B internal height	12	mm
sleeve length on side B	20	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	10	mm
end chamfers	none

Oval duct transition adapter STL 3D file 20.1x10 mm to 19.1x19 mm – transition: 100 mm (📦 #7574)

1 object(s) - format STL

STL 3D file for an oval adapter. On side A, the internal cross-section is 20.1x10 mm (oval), whereas on side B it is 19.1x19 mm (nearly circular). Each sleeve provides a useful length of 10 mm. The transition links the two ends over 100 mm, with a total overall length of 120 mm. The shell stays very lightweight, with only 1 mm of wall thickness. The internal edges at the ends are chamfered to help guide the duct during insertion. An offset of 10 mm along the Z axis is applied to side B relative to side A.

Parameter	Value	Unit
side A internal width	20.1	mm
side A internal height	10	mm
sleeve length on side A	10	mm
side B internal width	19.1	mm
side B internal height	19	mm
sleeve length on side B	10	mm
thickness	1	mm
transition length	100	mm
Y offset	0	mm
Z offset	10	mm
end chamfers	inside

Oval duct transition fitting STL file 40x30 mm to 21x16 mm – transition: 20 mm (📦 #7385)

1 object(s) - format STL

Oval coupling in STL 3D file format. The internal cross-section on side A is 40x30 mm, while on side B it is 21x16 mm. The useful lengths are 10 mm (A) and 70 mm (B), respectively. The transition portion extends over 20 mm and the overall length, sleeves included, is 100 mm. Both the inner and outer edges at the ends remain unchamfered.

Parameter	Value	Unit
side A internal width	40	mm
side A internal height	30	mm
sleeve length on side A	10	mm
side B internal width	21	mm
side B internal height	16	mm
sleeve length on side B	70	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Oval hose adapter STL 3D file 183x71 mm to 98.1x98 mm – transition: 30 mm (📦 #7199)

1 object(s) - format STL

Oval duct coupling provided as a STL 3D file. On side A, the internal cross-section is 183x71 mm (oval), whereas on side B it is 98.1x98 mm (nearly circular). The useful sleeve length on side A is 10 mm, while on side B it reaches 50 mm. The transition links the two ends over 30 mm, with a total overall length of 90 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.

Parameter	Value	Unit
side A internal width	183	mm
side A internal height	71	mm
sleeve length on side A	10	mm
side B internal width	98.1	mm
side B internal height	98	mm
sleeve length on side B	50	mm
thickness	2	mm
transition length	30	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Hose-shaped reducer STL file 195.1x195 mm to 195x35 mm – transition: 100 mm (📦 #7183)

1 object(s) - format STL

Oval pipe adapter provided as a STL 3D file. Side A offers an internal cross-section of 195.1x195 mm (nearly circular) and side B 195x35 mm (oval). The sleeve on side A provides a useful length of 50 mm, and on side B 100 mm. The transition portion extends over 100 mm and the overall length, sleeves included, is 250 mm. Wall thickness is generous (5 mm). The internal chamfers help start the duct insertion more easily.

Parameter	Value	Unit
side A internal width	195.1	mm
side A internal height	195	mm
sleeve length on side A	50	mm
side B internal width	195	mm
side B internal height	35	mm
sleeve length on side B	100	mm
thickness	5	mm
transition length	100	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Oval Duct Transition Fittings

Oval duct transition fittings are designed to connect two oval sections with different dimensions or slight misalignment while maintaining a clean, accurate fit. These custom 3D-printed parts could be suitable for HVAC setups, air-handling systems, workshop projects, and any situation where a precise geometry is required. Their parametric design ensures a stable, reliable connection, especially in tight installations or when working with flexible hose-style conduits, as shown with this hose-type connector.

Several profiles can be generated depending on the application: a standard oval-to-oval transition to extend or adapt an existing duct, an offset version to compensate for centerline shifts, or a progressive reducer for smoother airflow between different cross-sections. Although primarily intended for oval transitions, this template can also produce round-to-oval adapters by tuning the dimensions precisely, as demonstrated by this round-to-oval transition. These models could also help create vent register adapters, such as this vent outlet adapter.

Every fitting is fully configurable: sleeve length, wall thickness, dimensions of both ends, offsets, and optional chamfers for easier assembly. This level of customization makes it possible to produce parts that deliver a clean and reliable transition and remain straightforward to 3D-print, whether for a technical setup, a prototype, or a practical everyday project.