Popular fittings › Blanking flange

Blanking flange

A closed cover with a configurable bolt flange for unused duct openings. Free 3D printable.

Opens with the sizes below. Change anything, then export 3MF, STL or STEP. Free, no account, runs in your browser.

Starting sizes

Need another size? Every dimension is editable in the designer, in millimetres or inches.

What it is

Bolts over an unused duct opening or machine port to close it.

How to measure

For a flange, measure the opening it covers and the centre-to-centre spacing of the bolt holes it must line up with.

Print tips

• The export already places every component in its recommended print orientation. Keep supports off sleeves, sockets and any sliding or tight-fit surface so they stay smooth; if your slicer asks for supports, paint them only where an outside overhang needs them.
• The “To buy” list shows the purchased hardware it needs.

Frequently asked questions

What size should I measure?

For a flange, measure the opening it covers and the centre-to-centre spacing of the bolt holes it must line up with.

What should I print it in?

PLA or PETG both work for dust collection at room temperature. Print in PETG or ASA if the air is warm or the part sits in the sun. Use 3–4 perimeters for an airtight wall; infill matters much less than wall count for ducts.

What hardware do I need to buy?

At these starting sizes it needs: bolts or screws, washers. The “To buy” list in the designer gives the exact sizes, lengths and quantities for your dimensions.

Does it need supports?

The export already places every component in its recommended print orientation. Keep supports off sleeves, sockets and any sliding or tight-fit surface so they stay smooth; if your slicer asks for supports, paint them only where an outside overhang needs them.

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