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Adapters & couplers
PVC pipe adapter, 40 mm to 50 mm
A reducing coupler that connects a 40 mm PVC pipe to a 50 mm pipe for low-pressure drains, dust collection or a garden gravity feed. One side is a socket with a 40.4 mm bore and 30 mm depth, the other a 50.4 mm bore 35 mm deep, joined by a conical section with a 3 mm wall and an internal flow path that steps as little as possible. A 0.5 mm chamfer at each mouth eases the pipe in, and printing upright with three or more walls keeps it round and stiff. Open the ready-made model free, resize it on your phone or computer, then download a print-ready STL, 3MF or G-code sliced for your printer, free.Opening the ready-made model and downloading it as STL or 3MF are free, no card; AI changes use credits, from Maker at $7.99 a month.No printer? We print this part and ship it to your door. See its priceUpdated
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Adjust
Change its numbers in the viewer for free, or ask the AI in the chat: wall thickness, hole size, the thing it clips onto. AI changes use 2 credits per request (1 for a quick edit, 3 for a redesign), paid with a plan from Maker at $7.99 a month.3Print
Download a watertight STL or 3MF free, with your numbers and hand edits, or G-code sliced for your printer at the same price. After an AI change the download is included in every plan (4 credits without one).
Dimensions of the ready-made model (editable)
| Parameter | Value |
|---|---|
| socket A internal bore | 40.4 mm |
| socket B internal bore | 50.4 mm |
| wall thickness | 3 mm |
| socket A depth | 30 mm |
| socket B depth | 35 mm |
| conical transition length | 15 mm |
| internal chamfer size at mouths | 0.5 mm |
Example prompt
Design a PVC reducing coupler. Socket A bore 40.4 mm, 30 mm deep. Socket B bore 50.4 mm, 35 mm deep. Conical transition 15 mm long between them, wall 3 mm throughout, 0.5 mm internal chamfer at each mouth. Overall length 80 mm, smooth internal flow path.
Fit notes
PVC sizes differ between metric and imperial systems and between manufacturers, so typing the measured outer diameters into SpeakCAD beats guessing at a downloaded coupler. Preview in the browser and ask for a longer socket, a male-to-female version or a 45-degree bend.
Questions people ask about a PVC pipe adapter, 40 mm to 50 mm
A reducing coupler that connects a 40 mm PVC pipe to a 50 mm pipe for low-pressure drains, dust collection or a garden gravity feed. One side is a socket with a 40.4 mm bore and 30 mm depth, the other a 50.4 mm bore 35 mm deep, joined by a conical section with a 3 mm wall and an internal flow path that steps as little as possible. A 0.5 mm chamfer at each mouth eases the pipe in, and printing upright with three or more walls keeps it round and stiff.
Click Open it free on this page and create a free account (no card): the ready-made model opens in your browser, on your phone or computer, nothing to install. Change its numbers in the viewer for free and download a watertight STL or 3MF free, or G-code sliced for your printer at the same price. An AI change in the chat uses 2 credits per request (3 for a redesign), and the download after it is included in every plan (4 credits without one). Start with Maker: 50 credits a month for $7.99, cancel anytime.
On this page: open the ready-made model free in a SpeakCAD account (no card), change any dimension in the viewer, then download the STL or 3MF free, or G-code sliced for your printer at the same price.
A shared STL is modelled for someone else's measurements. Here you open the ready-made model free, change it to your measurements in the viewer, then download a file sized for the part you actually own, free as STL or 3MF.
Yes. SpeakCAD slices the part on its servers with OrcaSlicer and your printer's official profile (380+ printers, including Bambu Lab, Prusa, Creality and Elegoo), and you download the G-code (a sliced .gcode.3mf for Bambu Lab printers). G-code sliced for your printer costs the same as the STL: included in every plan, free for a part you shaped by hand, 4 credits without a plan for a part with AI work in it. Pick your printer on the printers page to see its profile.
No. SpeakCAD runs in the browser on your phone or computer: the chat, the 3D engine and the live viewer load in the tab. The only file you download is the finished STL, 3MF or sliced G-code.
Print it your way
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