120v AC Relay for Heatbed and Chamber Heater safe?

Hi all,
I am in the process of building a printer with a 12*12in (300*300mm) heatbed with a 400w heater element for heating the chamber. I realise that if I want to operate of 12 or 24v dc I would need a 1000w PSU costing at least 150 USD. I am wondering if you guys think it is safe to run the heatbed and heater off a 120vac relay? Also if anyone has a heatbed or heater running off 120 how does it preform?
Thanks

Yes it's possible, and I do it (except with 240V which is the mains voltage over here). See [duet3d.com] for guidance. It's aimed at users of Duet electronics, but the general principles apply to any 3D printer control electronics. See also Tom's video at [www.youtube.com]

---

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].