Heated bed..... More like luke warm bed.... Help?

I've built an I3 and when I bought it I ordered the heated bed kit for it. This is how I assembled it:



The heated bed takes about 10 minuted to get up to 30c. It can get up to about 35ish, but not much higher no matter how hot I set it.

Under the NiChrome wire I've laid down muffler exhaust wrap to insulate it. It hasn't helped much.

I'm trying to figure out if the bed can get any hotter then that, or if it's just as hot as the wire that came in the kit can get.

The kit came with 10 feet of 19 gauge NiChrome wire.

The calculations I came up with are:
27.69 Watts, 2.3 Amps, and 5.2 Ohms of resistance. The wire has .52 ohms per foot of resistance.

My heated bed is 9x12 and I'm trying to print ABS so I need to get up to about 100c.

So what it all boils down to....

Is there a way to make this bed get any hotter?

Edit
- I think I'm going to do some math, and possibly cut the NiChrome into 2 pieces. That should bring it up to 110 watts to heat with. If needed I do have relays to make it work.

Edited 1 time(s). Last edit at 04/01/2014 01:26AM by cfy7.

For 12v one circuit isnt going to work...

eg standard PCB HBP are 12v 11amp 1.1ohm resistance about 130 watts

maybe 2 ccts in parallel

5 * .52 = 2.6 per cct
in parallel 1/2.6 + 1/2.6 = 1.3 ohms a little high (the PCB HBP already takes to long)

for same as pcb hbp

1.1 ohm..
so 2.2 ohms per cct, ie 2 lengths of 4.23 feet in parallel ( no idea what a .23 of a foot in inches sorry... im metric)
Ie

4.23 * .52 = 2.1996 ohms
in parallel 1/2.1996+1/2.1996 = 1.0998 ohm

which is 12 * 1.0998 = 10.91amps, this is fine on standard ramps type electronics (use a heat sink on the mosfet, or a better mosfet than the standard one)

or you could use 26v at 5amp on your current resistance of 5.2 ohms for 130 watts (standard 11amp (heated build platform) ramps fuse is only good up to 16volts)

hope this scribble is understandable

Edited 2 time(s). Last edit at 04/01/2014 06:48AM by Dust.