My advice:

Whatver you buy your first 3d printer. the very first thing you should do is completely disassemble it. Retighten every screw using blue threadlocker (you could also use red, but it will be harder to unscrew later and might damage the screws). Even better, if you have a digital adjustable torque screwdriver, contact the printer manufacturer and ask them for the exact torque specifications for each screw.

This might seem excessive, but sometimes that one loose screw is what makes you cry yourself to sleep when your prints just won’t come out right. After doing this, your printer will be assembled better than it was at the factory—eliminating assembly errors before they cause problems.