I am building from scratch, but of course if I find ready made parts I don’t like to reinvent them. I purchased a very nice Z axis assembly on Ebay for $89 that already has Thomson AccuGlide rails and a very nice lead screw with zero backlash nut. I found a DLP projector on Craigslist for $40, but it needed a new bulb ($80). I also bought a new medium size flexvat and build plate from flexvat.com.
I initially tried to get it all working using NanoDLP, but there were issues with motor motion. I would push the move up 10mm button and it would move the proper distance, but then if I push the move down 1mm button, it would move down 10mm instead. Same was true for larger movements. Anyway, this made me pause and try your Photonic3D image in my Raspberry pi3, and it all worked perfectly on the first try. I am quite impressed!
I am ready to print as soon as I put all my parts on a frame and then tune it up, but before dealing with issues of the vat lift sequence and speeds, I might want to get into printing quickly by going top-down in a 400ml Pyrex beaker. I noticed that the “lift sequence” is a required line item in the software. Can you give me a quick suggestion to get the unit to just drop by the slice depth without all this prolonged lift sequence? Or perhaps you still effectively do a “lift sequence”, but you call it a drop sequence instead to make sure there is fresh resin on the surface. Hmmm… I’m learning.
I made a long (boring) video of my progress to date if you are interested. I give a review of the flexvat and a good endorsement of the Photonic3D running on the pi.