Shower Hair Catcher — Drop-In Cup with Magnet Pocket

Drop-in cup-style shower hair catcher that sits inside a typical

EU bathroom / shower / sink drain and stops hair before it clogs the

trap. One-piece print, no supports.

Default size: Ø43 mm cup body, Ø56 mm top brim flange, 5 mm deep

into the drain, ~9 mm overall Z. Sits on the drain rim (brim) with

the body dropping into the drain hole. Open top — water flows

straight into the bowl.

Magnet anchor. A small central chamber takes a Ø16 × 5 mm

captive magnet / puck. Insert via a print-pause (drop the puck in

through the open chamber cap during the print) or modify the SCAD to

make the chamber accessible from underneath. The magnet keeps the

catcher anchored against the drain rim and stops it floating away

under a strong jet.

Strainer pattern. Fine hex grid across the bottom plate

(2.5 mm flat-to-flat cells, 0.9 mm walls) lets water through while

trapping hair. Solid cage walls around the magnet chamber (no hex

windows) so hair can't bypass the strainer through the cage.

Cleaning. Lift the cup out by the rim, rinse hair off the bottom

hex, drop back in. The magnet keeps it seated.

Parametric. Edit the top of shower_hair_catcher.scadto retune:

catcher_dfor brim OD (38 / 50 / 56 / 75 / 90 mm presets in the

header), body_dfor cup OD, body_hfor cup depth into the drain,

chamber_dfor the magnet pocket.

The three-photo gallery shows the cup top-down (hex bottom + central

magnet cap), bottom view (Voronoi-look hex underside), and installed

in a real shower drain.

Designed iteratively over V1..V10 — narrow body, solid cage walls,

open top with no closed-top bridges.