A conventional saddle is foam of one density glued over a shell — comfortable where the mould happened to put material, less so where it didn't. A 3D-printed saddle replaces the foam with a printed lattice whose stiffness is tuned zone by zone: firmer under the sit bones where support pays, softer along the centre where pressure costs. The open structure also vents heat that closed foam traps.
Start with width, not weight
A saddle fits when your sit bones land on its support zones, and that is a function of width. The T200 measures 235 × 140 mm; the K03 Ultra runs 145 mm wide. If you know your current saddle's width and it works, stay within a few millimetres of it. If you don't, measure the one you ride before ordering — it is printed on the underside more often than you'd think.
The line-up, by intent
The T200 (from 64 €) is the range's all-rounder: 160 g printed, or 110 g in the EVA version, oval carbon rails, full carbon base, and a listed rider limit of 120 kg. The RT03 (86 €) is the classic road shape at a listed 175 g on 7×9 mm carbon rails. The K03 Ultra (116 €) leans towards mountain use — a high-modulus carbon base and its 145 mm width give it the most support of the four at 205 g. The AIRCODE (from 44 €) is the entry into hollow-carbon construction, with a choice of plastic or carbon base.
Two cautions
Carbon rails need carbon-compatible clamps — most current seatposts have them, but check that yours accepts oval 7×9 mm rails before ordering. And treat every weight above as the manufacturer's listed figure for the base size: printed structures vary a few grams between sizes and bases, in both directions.
The short version
Match width first, then intent: T200 for most road and gravel builds, RT03 if you want the lightest classic shape, K03 Ultra for technical terrain, AIRCODE to try the construction without committing a hundred euros to it.
