LIBRARYDFM and ordering a board.

Design for manufacturing means drawing a board the factory can actually build, cheaply and reliably. Respect the fab's minimums, pick sane options, and read the cost drivers before you order. A manufacturable board is boring in all the right ways.

The manufacturability basics

DFM is mostly the DRC numbers plus a few board-level ones: minimum trace and space, minimum hole and annular ring, and a sensible board size and layer count. Stay comfortably inside the fab's limits rather than right at the edge, because a design that hugs the minimums yields worse and costs more to build.

What drives the cost

A few choices move the price far more than the rest: the layer count (two is cheap, four steps up, more climbs fast), the board size, the quantity, the surface finish, and the lead time you pick. For a small board the biggest levers are usually layer count and quantity, so a two-layer board bought in a modest batch is the cheap sweet spot most projects start from.

ENIG versus HASL finish

The surface finish is the coating on the exposed pads. HASL (hot-air solder levelling) is a tinned finish, cheap and solderable, with a slightly uneven surface. ENIG (electroless nickel immersion gold) is flat and gold-topped, better for fine-pitch parts and nicer to hand-solder, at a higher price. For most through-hole and larger surface-mount work HASL is fine; reach for ENIG when a part is fine-pitch or the flatness matters.

The ordering flow

Ordering is: upload your zipped gerbers and drill file, let the fab's checker parse them and show you a render, choose the layers, thickness, finish, color, and quantity, and place the order. Many fabs return a short DFM report flagging anything marginal in your files, which is a last free check before your board is committed to copper.