Someone else has trouble too with slow heating from the heated bed?
I tried already 3 different power supplies 12V (15A, 25A, 30A).
Used it via an power-expander: reprap.me/power-expander.html
I also tried direct to power supply, same result.
The first 50°C degrees go ± fast, from 50°C to 68°C speed is ok, above 68°C its really slow.
After 35 min still only 70°C.
Any suggestions someone? Different cable? Broken heated bed? …?
What time does it take in your case to warm up to 100°C?