How to Pour Copper on PCB: Step-by-Step Guide

To pour copper on a PCB, use your PCB design software's Copper Pour or Polygon Pour tool to fill an area with copper connected to a net. This creates a copper area that helps with grounding or power distribution and reduces etching time.

Syntax

In PCB design software, the copper pour is created using a polygon or pour tool with these main parts:

• Area selection: Define the shape or boundary where copper will be poured.
• Net assignment: Connect the copper pour to a specific net (like GND or VCC).
• Clearance settings: Set the minimum distance from other copper features.
• Thermal reliefs: Control how the copper connects to pads to ease soldering.

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CopperPour(Area, Net, Clearance, ThermalRelief)

Example

This example shows how to pour copper on the ground net in a rectangular area using typical PCB design software:

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1. Select the Polygon Pour tool.
2. Draw a rectangle around the board edge.
3. Assign the net to 'GND'.
4. Set clearance to 0.2mm.
5. Enable thermal reliefs for pads.
6. Finalize the pour and update the board to see the copper area.

Output

A large copper area appears on the PCB connected to the ground net, filling the defined rectangle with copper except where pads or tracks keep clearance.

Common Pitfalls

• Not assigning the copper pour to a net causes it to float and not connect electrically.
• Setting clearance too small can cause short circuits or manufacturing issues.
• Forgetting thermal reliefs makes soldering difficult because pads connect solidly to large copper areas.
• Not updating or repouring the polygon after changes leaves outdated copper areas.

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Wrong:
CopperPour(Area, None, 0.1mm, NoThermalRelief)

Right:
CopperPour(Area, 'GND', 0.2mm, ThermalReliefEnabled)

Quick Reference

Step	Description
Select Polygon Pour Tool	Choose the tool to create copper areas
Draw Area	Define the shape to fill with copper
Assign Net	Connect copper pour to a net like GND or VCC
Set Clearance	Define safe distance from other copper features
Enable Thermal Reliefs	Make soldering easier on pads
Update/Repour	Refresh copper pour after changes

Key Takeaways

Always assign your copper pour to a net to ensure electrical connectivity.

Set proper clearance to avoid shorts and manufacturing problems.

Use thermal reliefs on pads to simplify soldering.

Remember to update or repour copper polygons after edits.

Copper pours help with grounding, power distribution, and reduce etching time.