my Little sling is now at about 2cm leg span, and i find that he doesnt want to eat any more often than every three days, even if i make the food available for him he wont eat every day.

iv had him for two weeks now and he is 3 months old, anyone got any idea when i can expect a molt?

I have found that the tips of their toes start going black and the abdomen gets darker about a week before a molt. The experts can correct me if I'm talking through my arse

well iv noticed him getting darker and his toes are definitely black now , and he doesnt move around much he has just been making webs at the top of his little tank for the last few days.
he hasnt eaten since Saturday morning and the cricket i put in last night was still there this morning so i just took it out i didnt want it to bother him too much.

Then I think he'll be sporting a new suit sometime next week

i sure do hope so! i am on my nerves about his first molt with me! iv hear and read that so much can go wrong for the little sling during molt.

If the humidity and temperature is right then you have nothing to fear.