Bed temp drops during print

K8200 3D Printer K8200 - Issues while printing
1

Hello everybody.

I have recently encountered a strange problem.

Before print i heat up my bed to about 60 degrees, pretty fast and no problems.

But when the print starts, it´s like there isn´t enough power to heat the bed sufficiantly, so the temp drops to about 45 degrees even though the led on the controller board shows full heating.

and therefore my models comes loose from the bed.

anyone had this problem?
any fix?

please and thank you

2

Try to measure the voltage on the 15V input during the print.
It might drop due to an overloaded 15v supply.

cheers,

Christian

3

Make sure you haven’t accidentally set a different temperature for first and later layers.

4

Hi, I have suffered with the same problem. The standard bed supplied with 15V just doesn’t have the power to maintain temperature under some conditions (normaly to do with the fan). As it is common, various options have been found.

  1. Use a 24v power supply to power the bed (switched through a relay or FET). This ups the power output by about 2 1/2 times: 15 Volts / 5 Ohms = 3 Amps X 15 Volts = 45 Watts. 24 Volts / 5 Ohms = 4.8 Amps X 24 Volts = 115.2 Watts.
  2. Ensure that the fan duct directs air horizontaly across the part and not directly onto the bed.
  3. Try not to use the fan on the lower levels of the print if possable (not always possable).
  4. Only heat the bed to 50 deg (not 60) when cooling does occure the part doesn’t shrink as much remains attached to the bed.
  5. When printing small detailed parts that needed lots of cooling from the start, I have had to cover (insulate) unused parts of the bed to maintain temperature.

1 Cures the problem. 2,3,4 & 5 will help you manage the problem.

I ended up buying a MK3 printbed, details at the end of this post http://reprap.org/wiki/PCB_Heatbed not only does it cure the problem you can cook your breakfast on it.

5

[quote=“Barnabybear”]

I ended up buying a MK3 printbed, details at the end of this post http://reprap.org/wiki/PCB_Heatbed not only does it cure the problem you can cook your breakfast on it.[/quote]

Nice idea! LOL!