That is your recipe for disaster, and why so many Kickstarter projects fail. The Bill of Materials (BOM) is just a subset of the Cost of Goods Sold (COGS), and if you aren’t selling your product ...

the Bill of Materials will let you know if you have enough components for the assembly stage. A video of the tool in action is embedded after the break, and you can download the BoM template here ...

The tariffs will apply to the Bill of Materials rather than the retail price of the device - but even so, the 54% tariff on China will have a massive impact.