I have a few of these (www.amazon.com/gp/product/B07N528213/) and very happy. No need for a vacuum pump. We've seen the vacuum table products out there and have kicked around the idea, but nothing is being pursued atm. We were just discussing what gallon compressor might be recommended; internally. How many tool changes can you get out of each gallon of compression? We're going to be running some tests to see.

For our initial tool-holder/rack design we've come up with these static surface and flush mount designs. Extra tool-holders can be purchased so 10 is easily possible. As for a single mountable rack, it's suggested to mount the individual 3d printed parts in a row on a board, then mount the board onto the bed. Our goal is to accommodate users desired configurations and allow for as much customizability as possible.

Correct, ISO20 tool holders are ER20 and fully support any of our ER20 accessories on our website.

I believe another video mentioned 3"