I don't know if any crafting is "fun" but I don't mind things like getting the items together to craft a weapon, or even a box of ammo. But the box of ammo recipe is locked behind a full set of books for each ammo type. Having the escape from tedium be such a long and RNG based journey doesn't appeal to me.
Like, right now I am building on a new room to my Red Mesa base. With each block costing 10 concrete mix I went through a stack of 1000 in no time. However, now, I am constantly jumping back and further between forges and cement mixers to keep the queues full. After about 10 minutes I only have a couple hundred.
It wouldn't be such a big deal if I could queue up as many as I want but with only 4 queue slots I find crafting to be more of a chore than a rewarding game mechanic.
EDIT: you know what, belay my last, I just discovered you can make stacks of items by increase the craft quantity. lol. That eleviats a lot of the concerns I have with crafting.