120V heater pad

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Pad

  • Amazon $20 - [1]
  • Ebay $15 in 4 quantity - [2]
  • $13 from China - [3]

Resistors

  • Use resistors instead - [4]

Halogen As Heater

  • Halogens are about 85% heaters.
  • For 3D printers, use a 240V bulb, run it at 1/4 power with 120V (P~I^2R) so it doesn't burn out with on-off cycling - by running it only at a fraction of its rated power.
  • Use a holder - 4.69 or 4-11/16" holder, for a 240V T3 bulb. [5]
  • R7S is the style of holder -[6]
  • This bulb is T3 R7S, 118 mm long - [7]
  • 1500/375W 240/120v - [8]
  • Or use 2 120V 500W in series, more even bed heating, using 2 bulb holders - [9]