Can this be used with a regular portafilter? Or has it got to be a bottomless one?

As long as the portafilter you are using is 54mm then it should work just the same.

I have the notsek 51mm and use it in a 53mm basket. you think one in 53mm would work better or 2mm space doesn't bother? i think it doesn't.

yes I think 53mm would be better then you may not have channelling anywhere hope this helps

Is this supposed to be completely flat? I received mine a few days ago and it is a bit convex (pointy) in the middle and the ouside slightly higher.

Yes in my opinion it should be flat. Mine is. Level with the top of the coffee grains in the portafilter basket.

Can someone help me out - i have a sage barista express and confused on size to purchase sizings of 54mm and 58.5mm

The Barista Express is a 54mm portafilter so you want the 53.5mm one.

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NOTSEK 58mm Puck Screen for 58mm Portafilter 1.7mm 150μm

NOTSEK 58mm Puck Screen for 58mm Portafilter 1.7mm 150μm

Product ID: 441295028

Details

Brand
NOTSEK
Compatible devices
Coffee Maker
Material
Stainless
Number of pieces
1
Shape
Disk

⏱️Saves cleaning time by reducing coffee buildup

⚙️1.7mm thickness for durability

🛡️316L stainless steel, food-grade & heat-resistant

₨433

Duties & taxes included

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

☕ Elevate your espresso game with every shot—because your coffee deserves precision.

FLAVOR AMPLIFIER - Even water distribution enhances richer flavor and creamier crema every time.
PRECISION EXTRACTION - Reduces channeling and grind disturbance for a smoother, more uniform espresso shot.
PREMIUM FOOD GRADE STEEL - Crafted from multi-layer sintered 316L stainless steel for sustainable, high-temp use without adhesives.
TIME SAVING BARISTA HACK - Minimizes cleaning and backflushing, freeing up your time for more coffee moments.
CLEAN SHOTS CLEANER MACHINE - Prevents coffee grounds from clogging your shower screen, extending espresso machine life.

The NOTSEK 58mm Puck Screen is a reusable, food-grade 316L stainless steel accessory designed to fit 58mm portafilters. It improves espresso quality by ensuring even water distribution, reducing channeling, and keeping your espresso machine cleaner by preventing coffee buildup on the shower screen. Durable and easy to clean, it saves time on maintenance while enhancing flavor and crema for the discerning at-home barista.

Specifications

ASIN	B09Z2GS4W5
Best Sellers Rank	101,398 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 102 in Reusable Coffee Filters
Brand Name	NOTSEK
Compatible Devices	Coffee Maker
Country Of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (1,620)
Item Highlight	Resuable, Stainless Steel, Coffee Espresso Lower Filter Screen, with Acrylic Storage Box
Item Shape	Disk
Item Type Name	Puck Screen
Item Weight	30 Grams
Manufacturer	NOTSEK
Manufacturer Part Number	NS-V1PS-58MM
Material Type	Stainless Steel
Model Number	NS-V1PS-58MM
Number of Packs	1
Number of Pieces	1
Package Size Name	Single Drive
UPC	765154528472
Unit Count	1.0 count

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