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Design Your Own Raspberry Pi Compute Module PCB
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Simple Brass Whistle
Great job. The surface on that bonus opener would be a whole lot cleaner if you were in the habit of wiping off the anvil. Every one of your shots shows your piece sitting on a mess of scale.
Nice job. Read the label on any boiled linseed oil that you buy. The cheap stuff is made with metals that might be toxic. Also, oils that can go rancid arent a good choice (canola oil, olive oil, etc.) Mineral oil is a safe bet as well as some others. Also, be really careful with the rags you use ... Boiled linseed oil, in particular, can self-combust! The rags should go in water or a fire-safe cannister.
Hand Stitched Leather Rucksack
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That's clay slip. She's using the slip casting technique, which involves filling the mold with liquid clay and then pouring it out. That picture is before she's poured it out. The technique is for making hollow, thin-walled ceramic forms. It requires a plaster mold (which absorbs moisture from the clay slip), which is why she is making a "mold of a mold" and not just simply creating a plastic mold.
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baking *bread :)
I'd agree with everything you said, except that without any insulation and a minimal amount of thermal mass, this oven will probably best suited to pizza, roasting meat/vegetables, etc. Baking break would require a different design, where the heat can be stored in the thermal mass and kept there with insulation. Looks cool either way - enjoy the pizza!
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Or skip the laser printing altogether and just draw the traces on the PCB blank with an industrial Sharpie or nail polish before etching!
There is no way it will be cheaper to have someone else do it. The alternative to ferric chloride is really inexpensive: Muriatic Acid can be had at Home Depot (or local DIY shop) and Hydrogen Peroxide is <$1 at any grocery store. Magazines/catalogs are free and when I used to use this method back in grad school, I just found the cheapest laser printer on craigslist and bought it just for this purpose (I think it was $10). OSH Park is great, but if it's for a single 1-sided board, it's much better to at least take a stab at doing it yourself.
How to make Machinable Wax at home!