Strange behavior of tinkergnome preheat in combination with M104 Gcode

[jungle2go 0]

 

I have an Ultimaker2 with Tinkergnome software. Recently i noticed strange behavior in the preheat menu. When I set the nozzle temperature to 10 degrees in the menu and i want to reset it to 0 with G-command "M104 S0" from USB, the setting goes to 160 degrees. In another case I saw it go to 200 degrees. I don't have the latest version of Tinker. I can not update because of partly broken USB-chip. Is this a known bug? If I send "M104 S1" it works fine.

 

My response to M115:

FIRMWARE_NAME:Marlin Ultimaker2; Sprinter/grbl mashup for gen6 FIRMWARE_URL:http://github.com/Ultimaker PROTOCOL_VERSION:1.0 MACHINE_TYPE:Ultimaker EXTRUDER_COUNT:1

[tinkergnome 927]

I don't have it in front of me at the moment, but i think, it's more like a feature... ?

 

The preheat menu handles the nozzle (pre-)heating on its own (if it is enabled), but only if the target temperature is zero. The choosen temperature depends on the printing temperature of the selected material.

There's no gcode to enable/disable the pre-heating, but any other target temperature than zero (whatever you send via USB) "overrules" it.

 

I think you can use either the preheat menu or serial commands for pre-heating but not both at the same time (at least not in this way).