Free No account needed

PipeFitter

Adapters that join two pipes or hoses, with bends, barbs, flanges and slip joints

PipeFitter is a free browser tool for vacuum, dust collection and hose adapters in odd sizes. Free with no account; the author links an optional Buy Me a Coffee page. Exports STL and 3MF. Last checked 26 September 2026.

Open PipeFitter See alternatives

Opens mankyd.github.io

At a glance

Price: Free with no account; the author links an optional Buy Me a Coffee page
Runs on: Browser
Exports: STL, 3MF
Multicolor: No, single color
Account: Not needed
Open source: Yes
Skill level: Easy: a few settings to tune
Best for: Vacuum, dust collection and hose adapters in odd sizes
Selling prints: Allowed The code is MIT licensed and the site shows no terms that limit what you do with the parts you export
How we checked: Opened the generator Loads with no account; changing the inner diameter redrew the 3D view, cross section and share link at once, with 6 end styles and an STL or 3MF menu
Last checked: 26 September 2026

Open generator

Sources: Help page (HELP.md), Source code and MIT license, Show HN launch post (checked 26 September 2026)

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What is PipeFitter?

PipeFitter is a free browser tool that designs a connector between two round tubes, such as a workshop vacuum hose and a pipe that is a little bigger or smaller. You build the part as a chain of straight sections joined by bends. Each section gets its own inner diameter (1 to 120 mm), outer diameter and length, and each bend can turn anywhere from -180 to 180 degrees, so reducers, elbows, S-shapes and U-turns are all possible.

The two open ends can stay plain or get a chamfer, a bolt flange with holes, a hose barb, grip teeth for wire-lined hoses, or a slip joint that plugs into or over a mating pipe with an adjustable tolerance. A design can hold up to four separate pipes joined end to end, handy when a run is too long for the bed or needs to come apart. A 3D view and a cross-section drawing update as you edit, and every setting is kept in the URL, so a link brings back the exact design.

Downloads are STL or 3MF, either as is or stood on one end face. There is no account, and the code is on GitHub under the MIT license. It suits makers who need an odd-sized adapter today and would rather not open CAD for it.

What you can make

Hose and pipe reducers
Elbows, S-bends and U-turns
Hose barb adapters
Flanged pipe connectors
Slip-joint couplers
Multi-part pipe runs

How to use PipeFitter

Open PipeFitter and pick mm or inches
Set the inner diameter, outer diameter and length of each section, adding sections and bends as needed
Choose an end treatment for each open end, such as a hose barb, flange or slip joint
Check the 3D view and the cross section for fit
Download an STL or 3MF oriented on one end face and slice it

What you'll need to print it

Filament and parts that suit what you make with PipeFitter.

PETG

M3 screws

Bambu Lab Fastener Kit Bambu Lab
Hilitchi M3 socket head cap screw assortment kit (affiliate link) Amazon

M3 heat-set inserts

Also handy

Digital calipers

Filament dryers and dry boxes

SUNLU FilaDryer S4 (affiliate link) Amazon
Polymaker PolyDryer (affiliate link) Amazon

Some of these are affiliate links: we may earn a small commission, at no extra cost to you. More about that

PipeFitter pros

Six end styles, including hose barbs, grip teeth, bolt flanges and slip joints with a tolerance setting
The whole design lives in the URL, so it can be bookmarked or shared as a link
Exports STL or 3MF already stood on an end face, with no sign-up and MIT-licensed source

PipeFitter cons

Round tubes only, all bends in one plane: no square ducts and no Y or T splitters
No threaded ends, and linked options such as mated ends and shared values take a read of the help page
A new side project with almost no community track record as of September 2026