Hi Mark,
First of all I want to say thanks to You and Stefan for pioneering work for DIY prototypes.
I love your processes, development, and sharing of knowledge.
For multilayer boards, I've always been an advocate of printing single-sided thin
PCBs and layering them up as needed. On Ebay you can get the material in 5mil, 8mil and 10mil
and if only double sided material, you can use the extra side as planes and isolate route or etch them
in an extra step. If my stackup is to thin, say for only 2 sides, I found bare FR4 that I use as a base
to bind the sides to for stiffness.
Alignment fudicials or targets are used for each pattern. Then after etching, I drill fine holes
through which I insert sewing needles or music wire to align during the stackup.
I was using 3M spray adhesive, but it can be unforgiving of misalignment. Someone mentioned a slower thin epoxy solution and that made sense for me. You just have to remove any epoxy 'extrusions' that occur from the holes.
So for me you process is darn near perfect, the added stability you propose is surely a benefit too.
I hope to get some pictures to share of results as time permits.
Best Regards, and sorry if I came across as pompous in the past, I was kidding.
Lee Studley
R. Lee Studley Senior Hardware /Software Engineer
InnovativeControl Systems, Inc. (ICS)
10801N. 24th Ave. Suite 103
Phoenix, AZ 85029
602-861-6984 MainLine
602-588-9440 FAX
www.icsaero.com