How to Reduce Scrap Through Better Design
Most scrap is decided at the CAD stage, not the cutting table
It’s tempting to think of scrap as a shop-floor problem, a machine setting, an operator error, a bad batch of material. In practice, most scrap is locked in long before a sheet ever reaches a laser bed. Manual nesting alone can waste 30–40% of a sheet’s material, and design choices made without manufacturing constraints in mind routinely turn into rework, oversized blanks, or parts that simply don’t nest efficiently. The good news: this means scrap is largely controllable, and the highest-leverage fixes happen at the design table.
Nesting Is a Design Decision, Not Just a Shop-Floor Task
Efficient nesting can reduce scrap rates from around 15% down to under 5%, but nesting efficiency starts with part geometry. Parts designed to fit standard sheet sizes, with consistent hole spacing and minimal irregular contours, nest far more efficiently than parts drawn without any regard for how they’ll sit on a sheet. Nesting software helps, but it can only optimize the geometry it’s given, a poorly designed part still wastes material even with the best software running the layout.
Design for Manufacturability (DFM), Applied Early
DFM means considering fabrication constraints, bend radii, minimum hole-to-edge distances, tooling limitations, during design rather than after a prototype fails. Manufacturability errors that surface late in production can consume up to half of production time in fixes and rework, which is a far more expensive way to discover a design flaw than a DFM review would have been. Standardizing on common materials, gauges, and hole sizes across a product line compounds these savings across every part, not just one.
The Cost Picture
Fabricators applying nesting optimization, standard materials, and DFM principles together report cost reductions in the range of 20%, split roughly across less material waste, faster setup times, and more efficient labor allocation. None of these gains require new equipment, they require design decisions made with manufacturing in mind before the drawing is finalized.
What Engineers Can Control
Favor standard sheet dimensions over custom sizes where tolerances allow. Group similar parts and gauges to simplify nesting across a production run. Involve your fabrication partner in a DFM review before finalizing drawings, a five-minute conversation at the design stage routinely prevents a costly redesign after tooling.
Rishi Laser’s Approach
At Rishi Laser, our design and development team works with OEM engineers ahead of production to flag nesting inefficiencies and manufacturability issues before they become scrap, across 46,000 MT/year of processing capacity where material efficiency compounds at scale.
Related reading: The Ultimate Guide to Types of Laser Cutting and Why 0.1mm Makes a Difference in Heavy Engineering.
FAQ’s
Manual nesting can waste 30–40% of a sheet; optimized nesting can bring scrap rates down from around 15% to under 5%.
Design for Manufacturability means accounting for fabrication constraints during design. It prevents costly rework, which can otherwise consume up to half of production time on flawed designs.
Yes, combined with nesting and DFM, standardization contributes to overall cost reductions of around 20% across waste, setup time, and labor.
Yes. Part geometry determines how efficiently it can be nested; software can only optimize within the constraints the design allows.
Before drawings are finalized, a DFM review at that stage is far cheaper than a redesign after tooling or production has started.
