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New solder pads have a plated through hole by default, while pads saved without a hole type stay non-plated; Gerber marks pads with a hole as component pads and pads without one as SMD pads

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Bane Stojkovic
2026-11-12 11:27:07 +01:00
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diylc/docs/plans/bottom-side-components.md
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@@ -57,7 +57,9 @@ projects; the open questions below remain.
| Bottom-side text is mirrored centrally in the Gerber output | Parts draw their labels readable from the top, which is backwards on the bottom silkscreen once the board is turned over. While `GerberExporter.drawComponent` draws a bottom-side part, `GerberG2DWrapper.setMirrorText` mirrors each string about the centre of its layout box, so no component changes and the canvas keeps readable labels. |
| A part without a side placed in the mirror is placed unchanged | A jumper, eyelet or wire has no side to set, so it is placed at the reflected point like any other part rather than refused. |
| A `SolderPad` opens the solder mask on its own side | It used to write `SolderMaskBot` whatever its layer, which was wrong for top-layer pads. It now writes `SolderMaskTop` for a pad on `_2`. |
| A `SolderPad` with a plated through hole is on both layers, and its Layer is ignored | A plated hole has a copper ring on each side joined by the barrel. The pad reports layer id `0`, which connects to copper on every layer, draws as both sides, and writes both copper and both mask layers. Projects where such a pad overlaps a trace on its other side now net differently; PTH is not the default and arrived with Gerber export, so few projects are affected. |
| A `SolderPad` with a plated through hole is on both layers, and its Layer is ignored | A plated hole has a copper ring on each side joined by the barrel. The pad reports layer id `0`, which connects to copper on every layer, draws as both sides, and writes both copper and both mask layers. Projects where such a pad overlaps a trace on its other side now net differently; PTH was not the default before and arrived with Gerber export, so few projects are affected. |
| New `SolderPad`s are PTH; a pad saved without a hole type stays NPTH | Fab-made boards mostly want plated holes. The getter still falls back to NPTH, which is what pads saved before the hole type existed had, so old projects export and net as before. |
| A `SolderPad` writes `ComponentPad` to Gerber when it has a hole and `SMDPad,CuDef` when it has none | `ConnectorPad`, written for every pad before, is meant for edge connector pads. |
| `Via` is its own component, not a `SolderPad` option | It takes no lead and no node name, is tented (no mask opening), and has its own Gerber functions, `ViaPad` and `ViaDrill`. Like the PTH pad it reports layer id `0`. It has no Board Side, like `DrillHole`. |
## 3. Design