LogicalZero
Motor Controller Board, try 4: Back
The etched board. Generally, it came out fairly well -- well enough to attempt etching. There are still some toner stains on the bare areas of the board and a few deeper scratches in the copper, but those are only cosmetic and will be removed later. The edges aren't all as sharp as I'd have liked, but they should be functional. Several traces to the header on the left didn't transfer and were drawn in with etch-resist pen. A couple of places where the traces squeezed by pads under the IC (just right of the headers) got connected; scraping at the toner with a dental pick before etching cleared that up nicely.
Some transparent, gummy substance got transferred to the left side of the board. I didn't notice it until I'd already had the board in the ferric chloride. It resisted etching and may short some of the header pins. If so, a couple of seconds with a Dremel brush will take care of it.
The project is documented on my projects blog.
Motor Controller Board, try 4: Back
The etched board. Generally, it came out fairly well -- well enough to attempt etching. There are still some toner stains on the bare areas of the board and a few deeper scratches in the copper, but those are only cosmetic and will be removed later. The edges aren't all as sharp as I'd have liked, but they should be functional. Several traces to the header on the left didn't transfer and were drawn in with etch-resist pen. A couple of places where the traces squeezed by pads under the IC (just right of the headers) got connected; scraping at the toner with a dental pick before etching cleared that up nicely.
Some transparent, gummy substance got transferred to the left side of the board. I didn't notice it until I'd already had the board in the ferric chloride. It resisted etching and may short some of the header pins. If so, a couple of seconds with a Dremel brush will take care of it.
The project is documented on my projects blog.