Espresso & Coffee

Puck Screen

A fine mesh disc that sits on top of the puck

Brew stage

Puck Screen — illustrated reference plate

Specification
What it does	Sits between the puck and the group screen, distributing the water jet and keeping coffee out of the group head.
What it changes	It reduces the amount of coffee that sticks to the shower screen, which means less backflushing and a cleaner group. Whether it changes flavour is contested and depends heavily on the machine.
Dose impact	The screen takes up clearance in the basket. If you were already dosing to the top, adding one means reducing the dose or you will hit the shower screen.
Mesh and rim	Fine mesh for filtration, a rigid rim so it stays flat. A soft or warped disc curls and channels the water.
Cleaning	Rinse after every shot and give it an occasional soak. A screen clogged with oil is worse than no screen at all.
Not a substitute	It does not fix a bad tamp, an uneven dose or a channelling puck.

Overview

A thin perforated disc laid over the tamped bed. It keeps the shower screen clean, spreads the incoming water and protects the top of the puck from the jet of the group.

Espresso

Safety

The screen is hot and thin-edged after a shot. Lift it with a fingernail or a small tool, not a bare pinch, and rinse it before it dries.

Technical parameters

At a glance
Diameter	Matched to basket — typically 51, 54 or 58 mm
Thickness	0.2–1.7 mm depending on style
Mesh	Stainless, 100–200 µm typical
Dose impact	Reduce dose by the screen thickness
Cleaning	Rinse per shot; soak weekly

What actually goes wrong

Weigh the screen on the scale with the basket so the dose stays honest.
If the puck is soupy after adding a screen, the clearance is too tight.
Rinse it immediately — dried oil is what makes it stop working.

What it has to match up with

Basket of the same diameter
Dose adjusted for screen thickness

This guide is an independent educational reference. It is not a substitute for the instructions supplied with your own equipment, and nothing here is sold, sponsored or endorsed by any brand.