Dead Space 3 players who would rather spend real money in the interest of saving time can certainly do so, as the game's weapon crafting system will support microtransactions.
Normally, you'll be able to find crafting components while out and about, or by sending out scavenger bots to do the picking for you. If either option sounds like too much work, the in-game store offers a third and quicker avenue.
Speaking to Eurogamer, Dead Space 3 associate producer Yara Khoury explained:
"You can buy resources with real money, but scavenger bots can also give you the currency that you can use on the marketplace, so you don't have to spend [real world] dollars."
Glad it's at least optional, though BioWare did say the same thing about online multiplayer and game completion in Mass Effect 3. But hey, maybe Visceral Games is a bit more lenient in that regard.
That's not to say you can buy your way through the game. Even if you packed your online wallet with funds, weapon parts will only be unlocked as you progress, unless you're playing on a New Game+ save.