Cannot get headbed above 95^c (3 replies)

Hi folks,
at the final stage with the printer, calibrating the heatbed and nozzle.
I'm using a seperate ktype thermocouple to generate some accurate
values and make a new temptable, assuming createtemptable.py is ever
going to work.

I set bed temp to 150 theoretical, the ramps temp is out of wack seriously, and monitor
by holding the ktype thermocouple against the bed. After 15 minutes the highest
the bed gets is ~95^c, actual

My hardware is 12v MK2a, 400w(alledgely, never trust anything on ebay) psu, 4mm Al
print bed.3MM silicone insulating mat under the heatbed.

Settings,
All steppers disabled
HEATER_BED_DUTY_CYCLE_DIVIDER disabled.
Room temp ~25^C

So what am I doing wrong? All suggestions appreciated


Many thanks,
Andrew

UPDATE
Okay, I can get to 105^ to 110^ but it takes 30 - 45 minutes. No quite ideal :)