You want a 3D printer setup that actually finishes prints without turning into a second hobby of endless troubleshooting. If you buy the right machine now, it should last you years of prototypes, parts, and functional makes instead of leaving you shopping twice.
Watch the release cycles closely. When the new maker models drop in spring, last year's proven workhorse drops in price, making Prime Day in July or back-to-school sales in August the sweet spot to buy.
That 0% window is a hard deadline, not free money, so if you still carry a balance when the 18 months are up, deferred interest or standard rates will kick in and wipe out your savings.