DragonFly Design Center 220 Flat-Bottom Paper Filter - 50 sheets

A 32gsm flat-bottom paper filter shaped for the DragonFly Tri-Spin FS Flat Dripper (390ml), for greater consistency with a deeper brew bed

The DragonFly 220 Flat-Bottom Paper Filter from DragonFly Design Center is a 32gsm virgin wood pulp filter made specifically for the DragonFly Tri-Spin FS Flat Dripper (390ml). Its pleated, cake-style form opens into a broad flat base matched to the dripper’s geometry, so the coffee bed builds deeper and more uniformly for consistent percolation. Each pack holds 50 filters.

How the 220 Filter Fits the Tri-Spin FS

The filter is designed to the specifications of 390ml Tri-Spin FS. The dripper’s 20 raised ribs hold the pleated walls in shape so the paper does not collapse against the brewer wall, while the flat base sits over the Tri-Spin hollowed base, which distributes outflow across several exit points instead of one central orifice.

With the paper seated evenly, the bed settles at a consistent depth and the water meets the same resistance on each brew. Flow rate and contact time stay repeatable, so when total brew time or extraction shifts, you can trace it to grind size, dose, or pour structure rather than the filter.

A deeper bed also lengthens the path water takes through the coffee, which extends contact time during percolation and supports a fuller extraction at a given grind setting.

Product Details

Brewing with the 220 Filter

Open the filter into its flat-bottom form and seat it in the Tri-Spin FS Flat Dripper (390ml) so the base lies flat against the bottom. Pre-wet the paper with hot water to seat it against the ribs and preheat the brewer, then discard the rinse water before dosing.

Level the bed before the bloom so the slurry saturates evenly and the drawdown finishes flat. The filter works in both of the dripper’s modes: switch open for percolation, or switch closed for a full immersion steep before drawdown.

Compatible brewer (flat bottom): DragonFly Tri-Spin FS Flat Dripper (390ml).

The Filter Paper

•     Basis weight: 32gsm virgin wood pulp paper.

•     Shape: Pleated, cake-style flat-bottom form matched to the Tri-Spin FS Flat Dripper (390ml).

•     Food contact: Specified for direct and aqueous food contact, listed against GB 4806.1-2016, GB 4806.8-2022, GB 9685-2016, and GB 31603-2015.

Storing the Filters

Keep the box at room temperature in a dry place, away from direct light and strong odors. Stored this way, the filters have a shelf life of five years.

What’s in the Box

•     Filters: DragonFly 220 Flat-Bottom Paper Filter x 50, boxed

Specifications