Well, a lot of printers come with SD cards with documentation, also to use standalone. My assumption, and you know what they say about assume.

So yes, that is a fuse. It does look blown to me. Take your multimeter and set to resistance (ohms). If it reads 0, it is ok, OL is is open ( OverLoad or OuttaLuck, your choice ;-) )

What level of experience do you have with electronics. Reason I ask, is the level of detail we need to go into to help.

Anyway, depending on you soldering skills, you can replace it. For debug, do you have any automotive type / marine type fuse holders with pigtails, or we can make one with crimp connectors to a automotive fuse (for debug purposes only )
Can you read the fuse size on it? - EDIT: its marked right there t6.3A/250