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 Garfield666 wrote:
Ok, I set the supports to medium and from there on - smooth sailing. Printed a 28mm FPW french soldier, a 30mm G.I.Joe Cobra trooper, a mech and some 6mm tanks - all perfect.
Even antennas the size of a hair get printed flawlessly.

Thanks again guys, I'm off to print some more!

Once you're more comfortable with the process, you'll want to start using more than one support type on a model. Heavy supports with a .6 to .8mm tip for the points holding the most weight, and where scarring will be least noticable, like the undersides of feet. Medium supports with /3 to .4mm tips to hold up any load-bearing extremities or appendages such as arms or weapons. Light supports with .2 to .25mm tips for small islands and overhangs that only need to hold on for a few layers before they join the main model.

3dPrintingPro on Youtube has an excellent set of guides for this for both Lychee and Chitubox that will take you through the settings, process and thought behind using different kinds of supports, and you'll find you get much better results with a few minutes of manual supporting using various types than you will with simple auto-supports.

That said, I do find Lychee's island detection to be good enough 9 times out of 10, so rather than using auto-supports, try using Heavy supports to achor your model, add medium supports to any outstretched and load-bearing parts that stick out from the main model, and then running an island detection pass and auto-adding lights to any that are highlighted. Add a raft and auto-bracings and you should be good to go, and it's still faster than manually placing every single support.