M5 Screw Cap - tiny

Edit 1: added a thicker washer, better print both _b and _c then choose the one fits best
Edit 2: added no cross variant for cap _nc in case you use a screw driver then press the cap on washer

A two part
cap + washer
screw cap for Phillips Flat Head Screw M5
or ISO 7046 Cross recessed countersunk flat head screws

Is a tiny print.

Press fit the washer until no play,
scale the washer, if needed,
you may find it useful :o)