Homebrew PCBs

http://www.geocities.com/leon_heller
----- Original Message ----- 
From: "pr0pert" <propert@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, August 20, 2009 10:06 PM
Subject: [Homebrew_PCBs] Re: Making negatives


> --- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>>
>>
>> "leon Heller" <leon355@...> writes:
>> > DJ reckons they are about the same. I have to use the more expensive
>> > JetStar Premium with my HP 5940, the ordinary stuff was OK with the
>> > Epson printer I used to use.
>>
>> IIRC the difference is that premium supports both ink and pigment, the
>> other only supports one.  My printer happens to be the type that they
>> both support, so I see no difference.
>>
> OK I've ordered some Silkjet media and I'm ready to try this, but I
> may have gotten ahead of myself. It seems all the PCB editors
> output positive prints. How are you getting a negative print to be
> able to use a negative process resist? Is there a way of doing this
> with a gerber file? Hidden options for printing? turning the printer
> upside down ;)?

I use positive resist. The Pulsonix software I use can create negative 
output, though.

Leon