single sided pcb
You can mark the bottom layer as unroutable.
Click Options › PCB Properties.
Select the Copper Layers tab
In the Allow Routing box, select Copper Bottom, then click Properties
Uncheck the Routable check box
If you have a version that has PCB Layers in the spreadsheet, you can also do this a little easier.
Select the PCB Layers tab in the Spreadsheet View
For Copper Bottom, change Routable to No
...Create a Single-Sided PCB in Ultiboard
Problem:
The default in Ultiboard is to autoroute as a double-sided Printed Cicuit Board (PCB). How do I make a single-sided PCB in Ultiboard?
Solution:
To create a single-sided PCB in Ultiboard, using the Autoroute feature, you have to disable all but one of the copper layers. To disable a copper layer, follow these steps:
1. Create the board, using the Board Wizard, in the normal way
2. Select Options » PCB Properties
3. Go to the Copper Layers tab
4. Select the copper layer you want to disable from the drop down box in the Allow Routing section.
5. Press the Properties button in the Allow Routing section
6. In the Copper Layer Properties window, un-tick Routing
Now, when you run the Autoroute feature, it will not route on the copper layer that you have disabled.
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