A scalpel is the most precise cutting tool a modeller owns. A thin replaceable blade in a light handle lets the cut follow a marked line exactly, and you feel every change in the material as it goes. The category covers metal handles in the classic patterns with numbered blades, aluminium and non-slip grips for longer sessions, disposable scalpels with a protective cap, and sets where a handle arrives with a selection of blade shapes. It is a tool bought for feel rather than for force.
Fine work that needs a thin blade and a sensitive hand. Shaving a sprue stub flush with the surface, releasing a delicate part, removing flash, cutting a decal out of its sheet, scoring a groove before scribing, trimming masking tape in place on the model. Everywhere a heavier knife would push material ahead of itself, a scalpel simply passes through.
The classic slim metal handle is light and gives the best feel, but after a long session it presses into the fingers. A thicker non-slip grip is more comfortable and suits long cutting runs, as when masking or working through a batch of profiles. The handle system also decides which blade shapes will fit it.
A pointed blade is the most adaptable: it cuts with the point and the belly and gets into a corner. A curved blade is better on longer drawn cuts, because the edge carries the cut along its whole length. Angled and scraping edges serve for trimming and cleaning surfaces. Stock up in spare blades.
The complete tool including blade and cap. They are convenient because nothing has to be swapped, and practical where a guaranteed fresh edge matters — cutting decals or masking tape, for instance.
Cut in two passes. The first stroke only establishes the path, with almost no pressure; the following ones deepen the groove. Pressure in a single pass is the main reason a blade wanders or snaps. Lead it along a steel edge from rules and squares and keep a cutting mat under the part, which blunts the edge far less than a hard bench. Never use a scalpel to lever anything — a thin edge breaks in a fraction of a second.
For cuts through thicker material a scalpel is not enough, and a tool from saws takes over.
