> I think what is happening is that for a home brew project they are
getting
> Olimex to drill all holes one size, presumably the smallest required
size. I
> assume Olimex make the PCB cheaper this way, so they do not need to set
up a
> number of drill sizes in an NC machine.
>
> Means that it is really only useful for single sided boards though.

I don't know about Olimex, but most board houses charge a flat fee for a
reasonable number of drill sizes (like 5 - 10).  Even so, it's hard to
imagine that the few pennies they might charge for an extra drill size is
worth the loss of plated holes and hassle of having to drill the larger
holes yourself.

However, if that's what you really want, then it's very easy to do with
Eagle.  Just edit the .DRL file so that all drill IDs are specified to be
the same size.


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