About heating bed - when it is needed

[Gonzo82nd]

This will be my first printer. I see some heated beds on ebay for under $20, what is there a difference from the one from QU

[DDeGonge888]

This will be my first printer. I see some heated beds on ebay for under $20, what is there a difference from the one from QU

Keep in mind that in order to have a successful heated bed you need three things.
1. A large enough power supply (150W in this case, normal backers w/o the heated bed only get a 100W supply)
2. Some kind of heating element/pad
3. A new build platform to go over the heating element/pad

Also, keep in mind that anything you buy off of ebay may not be compatible or may not fit. While it may only be $20 for the heated bed, you still need to buy the power supply which would be another $15-$20. But for just $35 more you can get a legitimate power supply, good heating element, and what I presume to be a fantastic basalt build platform. Just my two cents