Solved During mesh routine, bed heater disabled during movement?

[kb58]

The bed and extruder heaters were allowed to reach 60C and 205C, respectively. G29 S0 was then commanded to start testing the bed to develop a profile map. It was running fine, but part way through I noticed that extruder temperature was dropping off even though the heater was enabled and the 205C target was unchanged. Watching the bed heater output LED on the 6HC board, I noticed that it was also action odd, only lighting while the nozzle was in motion. Because of this, the average temperature was dropping way below the commanded set point.

I almost want to say that this could be a bug, but if no one else is seeing this, I'm mystified about what's going on. As said above, only G29 S0 was commanded, and G29 says nothing about disabling the bed heater, nor would it be expected to. Any ideas?

[fcwilt]

@kb58

Check your M558 command for a B parameter.

From the M558 docs:

Bn If 1, turn off all heaters while probing, default (B0) leaves heaters on. (RepRapFirmware 1.21 and later)

Frederick

[kb58]

@fcwilt Oh good lord... Yet another example of brainlessly copying code from who knows where without fully understanding each parameter. Yes, indeed: M558 P9 C"121.io0.in" F100 H5 R0.2 T6000 A5 B1

Thanks you, Frederick, again.

Edit: This is related to another thread I started, where I was puzzling how the heaters were disabled as the nozzle moved to the print start point. Another light has gone on.

[fcwilt]

@kb58

Always glad to help when I can.

Frederick