Mishra's Factory can / can't block as a 3/3 ?

[silvernail]

Can you activate factor, declare it as a blocker and then use itself to make it a 3/3 before damage resolves and have the block be legal ?

[Slack]

You can do this as long as you didn't play the factory that turn.  If you played the factory that turn, after you turn it into a creature it will have summoning sickness and won't be able to use it's <tap> ability.

[silvernail]

that's what i thought