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Some of the links don't make it into the PDF version that can be downloaded, and while you provide a link or two to your website, you never mention it in the text. You may want to add it at least one of the places you suggest using it to contact you for help and components. Thumbs up on the project, by the way!
Mold Making & Casting Class
In Step 18, you say, "Vat Option 1 did not work." Step 18 then describes an alternate approach. Why did Option 1 fail? Why do you prefer the other approach?Also, you barely mention the DLP projector. It would be useful to have your input on selecting one for use in this project, which really does interest me.
It takes 3 more transistors and a bit more space on the breadboard. Look up references to H-bridge to get the details. You'll be using another output pin on the Arduino, and an input pin to switch directions. Also have to be careful about changing directions when the motor is running--you might let the smoke out of your electronics. Also watch out for the polarity on your electrolytic caps--they're exciting when you violate them!
3D Printing Class
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