Craftbot: print3d hangs after M104 because the response is interpreted as a M105 response

[companje]

The Craftbot firmware has some small differences causing print3d to hang. For example "M104 S200" returns ok wíth temperature which is different from Marlin. Here's (http://reprap.org/wiki/G-code#M104:_Set_Extruder_Temperature) a description of M104 on the RepRap site.

[olijf]

After sending M104 S180 at the end of the printing process it seems to stop te printer somehow. This only happens at the end of a print.
Disabling the line in your printer config (in the custom GCODE settings in the webUI) seems to be an easy fix and workaround.

Relevant part of the log

15-02 14:50:18  [ABD] printNextLine(): 2903/2906
15-02 14:50:18  [MLD] sendCode(): M104 S180
15-02 14:50:18  [MLD] extractGCodeInfo()
15-02 14:50:18  [MLD]   (extractGCodeInfo) targetTemperature_: 180
15-02 14:50:18  [MLD] readCode(): 'ok T:230'
15-02 14:50:18  [MLD] parseTemperatures(): 'ok T:230'
15-02 14:50:18  [MLD]   checkTemperatureInterval_: '5000'
15-02 14:50:20  [MLD] update temp()
15-02 14:50:20  [MLD]   check temp
15-02 14:50:20  [MLD] sendCode(): M105
15-02 14:50:20  [MLD] extractGCodeInfo()
15-02 14:50:20  [MLD] readCode(): 'ok T:230 B:70'

Print3D seems to think the response ok T:230 is a reaction to a M105 command resulting in not returning the control to the user, forcing him to restart his doodl3d box.

Please advice users about this current workaround.

[peteruithoven]

But why doesn't this happen with the start gcode? This should also contain a temperature change command.

[companje]

My theory is that when it just misses 1 normal 'ok' (because of the
temperature behind it) it has still enough gcode commands in the queue.
Only at the end of a print it gets stuck because it keeps waiting because
it is expecting one more 'ok' but it never arrives.

On Mon, Feb 15, 2016 at 7:02 PM, Peter Uithoven notifications@github.com
wrote:

But why doesn't this happen with the start gcode? This should also contain
a temperature change command.

—
Reply to this email directly or view it on GitHub
#36 (comment).

[peteruithoven]

But, there is no such queue? It only advances to the next line when it receives an ok. If we miss one ok it should just stop sending lines. I don't understand what triggers print3d to send the next line.

[companje]

I think you're right Peter. It was the prototype where send 5 lines at the
start without waiting for ok to and then each next line after receiving an
ok. But in the MarlinDriver (
https://github.com/Doodle3D/print3d/blob/master/src/drivers/MarlinDriver.cpp) I
don't see this.

On Mon, Feb 15, 2016 at 8:44 PM, Peter Uithoven notifications@github.com
wrote:

But, there is no such queue? It only advances to the next line when it
receives an ok. If we miss one ok it should just stop sending lines. I
don't understand what triggers print3d to send the next line.

—
Reply to this email directly or view it on GitHub
#36 (comment).

[olijf]

In https://github.com/Doodle3D/doodle3d-firmware/blob/master/src/conf_defaults.lua#L225 there does not seem to be a M104 in the start code.

[olijf]

Attached is the log of sevaral sucessful prints. @peteruithoven wanted to checkout the Q:128 code as response to M190
craftbot.txt

[olijf]

As requested the relevant part of the log.

15-02 16:01:01  [MLD] readCode(): 'ok Q:128'
15-02 16:01:01  [ABD] printNextLine(): 2/331
15-02 16:01:01  [MLD] sendCode(): G21 
15-02 16:01:01  [MLD] extractGCodeInfo()
15-02 16:01:01  [MLD] readCode(): 'ok Q:128'
15-02 16:01:01  [ABD] printNextLine(): 3/331
15-02 16:01:01  [MLD] sendCode(): G91 
15-02 16:01:01  [MLD] extractGCodeInfo()
15-02 16:01:01  [MLD] readCode(): 'ok Q:128'
15-02 16:01:01  [ABD] printNextLine(): 4/331
15-02 16:01:01  [MLD] sendCode(): M107 
15-02 16:01:01  [MLD] extractGCodeInfo()
15-02 16:01:01  [MLD] readCode(): 'ok Q:128'
15-02 16:01:01  [ABD] printNextLine(): 5/331
15-02 16:01:01  [MLD] sendCode(): G28 X0 Y0 
15-02 16:01:01  [MLD] extractGCodeInfo()
15-02 16:01:02  [MLD] readCode(): 'ok Q:128'
15-02 16:01:02  [ABD] printNextLine(): 6/331
15-02 16:01:02  [MLD] sendCode(): G28 Z0 
15-02 16:01:02  [MLD] extractGCodeInfo()
15-02 16:01:03  [SRV] read 0 bytes from client with fd 5
15-02 16:01:03  [SRV] read 4 bytes from client with fd 5
15-02 16:01:03  [IPC] command: [>>getState]
15-02 16:01:03  [CDH] received get state command
15-02 16:01:03  [IPC] command: [<<ok]
15-02 16:01:03  [SRV] read 0 bytes from client with fd 5
15-02 16:01:03  [SRV] read 10 bytes from client with fd 5
15-02 16:01:03  [IPC] command: [>>getTemperature:s1]
15-02 16:01:03  [CDH] received get temperature command with arg 1
15-02 16:01:03  [IPC] command: [<<ok]
15-02 16:01:03  [SRV] read 10 bytes from client with fd 5
15-02 16:01:03  [IPC] command: [>>getTemperature:s2]
15-02 16:01:03  [CDH] received get temperature command with arg 2
15-02 16:01:03  [IPC] command: [<<ok]
15-02 16:01:03  [SRV] read 10 bytes from client with fd 5
15-02 16:01:03  [IPC] command: [>>getTemperature:s3]
15-02 16:01:03  [CDH] received get temperature command with arg 3
15-02 16:01:03  [IPC] command: [<<ok]
15-02 16:01:03  [SRV] read 10 bytes from client with fd 5
15-02 16:01:03  [IPC] command: [>>getTemperature:s4]
15-02 16:01:03  [CDH] received get temperature command with arg 4
15-02 16:01:03  [IPC] command: [<<ok]
15-02 16:01:03  [SRV] read 10 bytes from client with fd 5
15-02 16:01:03  [IPC] command: [>>getTemperature:s5]
15-02 16:01:03  [CDH] received get temperature command with arg 5
15-02 16:01:03  [IPC] command: [<<ok]
15-02 16:01:03  [SRV] read 0 bytes from client with fd 5
15-02 16:01:03  [SRV] read 4 bytes from client with fd 5
15-02 16:01:03  [IPC] command: [>>getProgress]
15-02 16:01:03  [CDH] received get progress command
15-02 16:01:03  [IPC] command: [<<ok]
15-02 16:01:03  [MLD] update temp()
15-02 16:01:03  [MLD]   check temp
15-02 16:01:03  [MLD] sendCode(): M105
15-02 16:01:03  [MLD] extractGCodeInfo()
15-02 16:01:03  [MLD] readCode(): 'ok T:228 B:63'
15-02 16:01:03  [MLD] parseTemperatures(): 'ok T:228 B:63'
15-02 16:01:03  [MLD]   checkTemperatureInterval_: '5000'
15-02 16:01:04  [MLD] readCode(): 'ok Q:128'
15-02 16:01:04  [ABD] printNextLine(): 7/331
15-02 16:01:04  [MLD] sendCode(): G1 Z15 F9000 
15-02 16:01:04  [MLD] extractGCodeInfo()
15-02 16:01:06  [MLD] readCode(): 'ok Q:128'
15-02 16:01:06  [ABD] printNextLine(): 8/331
15-02 16:01:06  [MLD] sendCode(): G92 E0 
15-02 16:01:06  [MLD] extractGCodeInfo()
15-02 16:01:06  [MLD] readCode(): 'ok Q:128'
15-02 16:01:06  [ABD] printNextLine(): 9/331
15-02 16:01:06  [MLD] sendCode(): G1 F200 E10 
15-02 16:01:06  [MLD] extractGCodeInfo()
15-02 16:01:06  [SRV] read 0 bytes from client with fd 5
15-02 16:01:06  [SRV] read 4 bytes from client with fd 5
15-02 16:01:06  [IPC] command: [>>getState]
15-02 16:01:06  [CDH] received get state command
15-02 16:01:06  [IPC] command: [<<ok]
15-02 16:01:06  [SRV] read 0 bytes from client with fd 5
15-02 16:01:06  [SRV] read 10 bytes from client with fd 5
15-02 16:01:06  [IPC] command: [>>getTemperature:s1]
15-02 16:01:06  [CDH] received get temperature command with arg 1
15-02 16:01:06  [IPC] command: [<<ok]
15-02 16:01:06  [SRV] read 10 bytes from client with fd 5
15-02 16:01:06  [IPC] command: [>>getTemperature:s2]
15-02 16:01:06  [CDH] received get temperature command with arg 2
15-02 16:01:06  [IPC] command: [<<ok]
15-02 16:01:06  [SRV] read 10 bytes from client with fd 5
15-02 16:01:06  [IPC] command: [>>getTemperature:s3]
15-02 16:01:06  [CDH] received get temperature command with arg 3
15-02 16:01:06  [IPC] command: [<<ok]
15-02 16:01:06  [SRV] read 10 bytes from client with fd 5
15-02 16:01:06  [IPC] command: [>>getTemperature:s4]
15-02 16:01:06  [CDH] received get temperature command with arg 4
15-02 16:01:06  [IPC] command: [<<ok]
15-02 16:01:06  [SRV] read 10 bytes from client with fd 5
15-02 16:01:06  [IPC] command: [>>getTemperature:s5]
15-02 16:01:06  [CDH] received get temperature command with arg 5
15-02 16:01:06  [IPC] command: [<<ok]
15-02 16:01:06  [SRV] read 0 bytes from client with fd 5
15-02 16:01:06  [SRV] read 4 bytes from client with fd 5
15-02 16:01:06  [IPC] command: [>>getProgress]
15-02 16:01:06  [CDH] received get progress command
15-02 16:01:06  [IPC] command: [<<ok]
15-02 16:01:07  [MLD] readCode(): 'ok Q:128'
15-02 16:01:07  [ABD] printNextLine(): 10/331
15-02 16:01:07  [MLD] sendCode(): G92 E0 
15-02 16:01:07  [MLD] extractGCodeInfo()
15-02 16:01:07  [MLD] readCode(): 'ok Q:128'
15-02 16:01:07  [ABD] printNextLine(): 11/331
15-02 16:01:07  [MLD] sendCode(): G92 E0 
15-02 16:01:07  [MLD] extractGCodeInfo()
15-02 16:01:07  [MLD] readCode(): 'ok Q:128'
15-02 16:01:07  [ABD] printNextLine(): 12/331
15-02 16:01:07  [MLD] sendCode(): G1 F9000
15-02 16:01:07  [MLD] extractGCodeInfo()
15-02 16:01:07  [MLD] readCode(): 'ok Q:128'
15-02 16:01:07  [ABD] printNextLine(): 13/331
15-02 16:01:07  [MLD] sendCode(): G90 
15-02 16:01:07  [MLD] extractGCodeInfo()
15-02 16:01:07  [MLD] readCode(): 'ok Q:128'
15-02 16:01:07  [ABD] printNextLine(): 14/331
15-02 16:01:07  [MLD] sendCode(): M117 Printing Doodle...   
15-02 16:01:07  [MLD] extractGCodeInfo()
15-02 16:01:07  [MLD] readCode(): 'ok Q:128'
15-02 16:01:07  [ABD] printNextLine(): 15/331
15-02 16:01:07  [MLD] sendCode(): G0 X99.850 Y99.100 Z0.200 F12000.000
15-02 16:01:07  [MLD] extractGCodeInfo()
15-02 16:01:08  [MLD] update temp()
15-02 16:01:08  [MLD]   check temp
15-02 16:01:08  [MLD] sendCode(): M105
15-02 16:01:08  [MLD] extractGCodeInfo()
15-02 16:01:08  [MLD] readCode(): 'ok T:230 B:63'
15-02 16:01:08  [MLD] parseTemperatures(): 'ok T:230 B:63'
15-02 16:01:08  [MLD]   checkTemperatureInterval_: '5000'
15-02 16:01:09  [MLD] readCode(): 'ok Q:128'
15-02 16:01:09  [ABD] printNextLine(): 16/331
15-02 16:01:09  [MLD] sendCode(): G1 X99.850 Y99.400 Z0.200 F2100.000 E0.025
15-02 16:01:09  [MLD] extractGCodeInfo()
15-02 16:01:09  [MLD] readCode(): 'ok Q:128'

Ending code:

15-02 15:53:02  [MLD] readCode(): 'ok Q:128'
15-02 15:53:02  [ABD] printNextLine(): 1990/2003
15-02 15:53:02  [MLD] sendCode(): G1 X105.346 Y65.460 Z4.400 F3000.000 E288.405
15-02 15:53:02  [MLD] extractGCodeInfo()
15-02 15:53:02  [MLD] readCode(): 'ok Q:128'
15-02 15:53:02  [ABD] printNextLine(): 1991/2003
15-02 15:53:02  [MLD] sendCode(): G1 X105.840 Y63.832 Z4.400 F3000.000 E288.475
15-02 15:53:02  [MLD] extractGCodeInfo()
15-02 15:53:02  [SRV] read 0 bytes from client with fd 5
15-02 15:53:02  [SRV] read 4 bytes from client with fd 5
15-02 15:53:02  [IPC] command: [>>getState]
15-02 15:53:02  [CDH] received get state command
15-02 15:53:02  [IPC] command: [<<ok]
15-02 15:53:02  [SRV] read 10 bytes from client with fd 6
15-02 15:53:02  [IPC] command: [>>getTemperature:s1]
15-02 15:53:02  [CDH] received get temperature command with arg 1
15-02 15:53:02  [IPC] command: [<<ok]
15-02 15:53:02  [SRV] read 10 bytes from client with fd 6
15-02 15:53:02  [IPC] command: [>>getTemperature:s2]
15-02 15:53:02  [CDH] received get temperature command with arg 2
15-02 15:53:02  [IPC] command: [<<ok]
15-02 15:53:02  [SRV] read 10 bytes from client with fd 6
15-02 15:53:02  [IPC] command: [>>getTemperature:s3]
15-02 15:53:02  [CDH] received get temperature command with arg 3
15-02 15:53:02  [IPC] command: [<<ok]
15-02 15:53:02  [SRV] read 10 bytes from client with fd 6
15-02 15:53:02  [IPC] command: [>>getTemperature:s4]
15-02 15:53:02  [CDH] received get temperature command with arg 4
15-02 15:53:02  [IPC] command: [<<ok]
15-02 15:53:02  [SRV] read 10 bytes from client with fd 6
15-02 15:53:02  [IPC] command: [>>getTemperature:s5]
15-02 15:53:02  [CDH] received get temperature command with arg 5
15-02 15:53:02  [IPC] command: [<<ok]
15-02 15:53:02  [SRV] read 4 bytes from client with fd 5
15-02 15:53:02  [IPC] command: [>>getProgress]
15-02 15:53:02  [CDH] received get progress command
15-02 15:53:02  [IPC] command: [<<ok]
15-02 15:53:02  [MLD] readCode(): 'ok Q:128'
15-02 15:53:02  [ABD] printNextLine(): 1992/2003
15-02 15:53:02  [MLD] sendCode(): G1 X106.055 Y61.779 Z4.400 F3000.000 E288.561
15-02 15:53:02  [MLD] extractGCodeInfo()
15-02 15:53:02  [SRV] read 4 bytes from client with fd 6
15-02 15:53:02  [IPC] command: [>>getState]
15-02 15:53:02  [CDH] received get state command
15-02 15:53:02  [IPC] command: [<<ok]
15-02 15:53:02  [MLD] readCode(): 'ok Q:128'
15-02 15:53:02  [ABD] printNextLine(): 1993/2003
15-02 15:53:02  [MLD] sendCode(): G1 X106.055 Y60.189 Z4.400 F3000.000 E288.627
15-02 15:53:02  [MLD] extractGCodeInfo()
15-02 15:53:02  [MLD] readCode(): 'ok Q:128'
15-02 15:53:02  [ABD] printNextLine(): 1994/2003
15-02 15:53:02  [MLD] sendCode(): M107 
15-02 15:53:02  [MLD] extractGCodeInfo()
15-02 15:53:02  [MLD] readCode(): 'ok Q:128'
15-02 15:53:02  [ABD] printNextLine(): 1995/2003
15-02 15:53:02  [MLD] sendCode(): G91 
15-02 15:53:02  [MLD] extractGCodeInfo()
15-02 15:53:02  [MLD] readCode(): 'ok Q:128'
15-02 15:53:02  [ABD] printNextLine(): 1996/2003
15-02 15:53:02  [MLD] sendCode(): G1 E-1 F300 
15-02 15:53:02  [MLD] extractGCodeInfo()
15-02 15:53:02  [MLD] readCode(): 'ok Q:128'
15-02 15:53:02  [ABD] printNextLine(): 1997/2003
15-02 15:53:02  [MLD] sendCode(): G1 Z+0.5 E-5 X-20 Y-20 F9000 
15-02 15:53:02  [MLD] extractGCodeInfo()
15-02 15:53:03  [MLD] readCode(): 'ok Q:128'
15-02 15:53:03  [ABD] printNextLine(): 1998/2003
15-02 15:53:03  [MLD] sendCode(): G28 X0 Y0 
15-02 15:53:03  [MLD] extractGCodeInfo()
15-02 15:53:03  [SRV] read 0 bytes from client with fd 5
15-02 15:53:03  [SRV] read 4 bytes from client with fd 5
15-02 15:53:03  [IPC] command: [>>getState]
15-02 15:53:03  [CDH] received get state command
15-02 15:53:03  [IPC] command: [<<ok]
15-02 15:53:03  [SRV] read 0 bytes from client with fd 5
15-02 15:53:03  [SRV] read 10 bytes from client with fd 5
15-02 15:53:03  [IPC] command: [>>getTemperature:s1]
15-02 15:53:03  [CDH] received get temperature command with arg 1
15-02 15:53:03  [IPC] command: [<<ok]
15-02 15:53:03  [SRV] read 10 bytes from client with fd 5
15-02 15:53:03  [IPC] command: [>>getTemperature:s2]
15-02 15:53:03  [CDH] received get temperature command with arg 2
15-02 15:53:03  [IPC] command: [<<ok]
15-02 15:53:03  [SRV] read 10 bytes from client with fd 5
15-02 15:53:03  [IPC] command: [>>getTemperature:s3]
15-02 15:53:03  [CDH] received get temperature command with arg 3
15-02 15:53:03  [IPC] command: [<<ok]
15-02 15:53:03  [SRV] read 10 bytes from client with fd 5
15-02 15:53:03  [IPC] command: [>>getTemperature:s4]
15-02 15:53:03  [CDH] received get temperature command with arg 4
15-02 15:53:03  [IPC] command: [<<ok]
15-02 15:53:03  [SRV] read 10 bytes from client with fd 5
15-02 15:53:03  [IPC] command: [>>getTemperature:s5]
15-02 15:53:03  [CDH] received get temperature command with arg 5
15-02 15:53:03  [IPC] command: [<<ok]
15-02 15:53:03  [SRV] read 0 bytes from client with fd 5
15-02 15:53:03  [SRV] read 4 bytes from client with fd 5
15-02 15:53:03  [IPC] command: [>>getProgress]
15-02 15:53:03  [CDH] received get progress command
15-02 15:53:03  [IPC] command: [<<ok]
15-02 15:53:05  [MLD] update temp()
15-02 15:53:05  [MLD]   check temp
15-02 15:53:05  [MLD] sendCode(): M105
15-02 15:53:05  [MLD] extractGCodeInfo()
15-02 15:53:05  [MLD] readCode(): 'ok T:230 B:70'
15-02 15:53:05  [MLD] parseTemperatures(): 'ok T:230 B:70'
15-02 15:53:05  [MLD]   checkTemperatureInterval_: '5000'
15-02 15:53:05  [SRV] read 0 bytes from client with fd 5
15-02 15:53:05  [SRV] read 4 bytes from client with fd 5
15-02 15:53:05  [IPC] command: [>>getState]
15-02 15:53:05  [CDH] received get state command
15-02 15:53:05  [IPC] command: [<<ok]
15-02 15:53:05  [SRV] read 0 bytes from client with fd 5
15-02 15:53:05  [SRV] read 10 bytes from client with fd 5
15-02 15:53:05  [IPC] command: [>>getTemperature:s1]
15-02 15:53:05  [CDH] received get temperature command with arg 1
15-02 15:53:05  [IPC] command: [<<ok]
15-02 15:53:05  [SRV] read 10 bytes from client with fd 5
15-02 15:53:05  [IPC] command: [>>getTemperature:s2]
15-02 15:53:05  [CDH] received get temperature command with arg 2
15-02 15:53:05  [IPC] command: [<<ok]
15-02 15:53:05  [SRV] read 10 bytes from client with fd 5
15-02 15:53:05  [IPC] command: [>>getTemperature:s3]
15-02 15:53:05  [CDH] received get temperature command with arg 3
15-02 15:53:05  [IPC] command: [<<ok]
15-02 15:53:05  [SRV] read 10 bytes from client with fd 5
15-02 15:53:05  [IPC] command: [>>getTemperature:s4]
15-02 15:53:05  [CDH] received get temperature command with arg 4
15-02 15:53:05  [IPC] command: [<<ok]
15-02 15:53:05  [SRV] read 10 bytes from client with fd 5
15-02 15:53:05  [IPC] command: [>>getTemperature:s5]
15-02 15:53:05  [CDH] received get temperature command with arg 5
15-02 15:53:05  [IPC] command: [<<ok]
15-02 15:53:05  [SRV] read 0 bytes from client with fd 5
15-02 15:53:05  [SRV] read 4 bytes from client with fd 5
15-02 15:53:05  [IPC] command: [>>getProgress]
15-02 15:53:05  [CDH] received get progress command
15-02 15:53:05  [IPC] command: [<<ok]
15-02 15:53:05  [SRV] read 0 bytes from client with fd 5
15-02 15:53:05  [SRV] read 4 bytes from client with fd 5
15-02 15:53:05  [IPC] command: [>>getState]
15-02 15:53:05  [CDH] received get state command
15-02 15:53:05  [IPC] command: [<<ok]
15-02 15:53:06  [MLD] readCode(): 'ok Q:128'
15-02 15:53:06  [ABD] printNextLine(): 1999/2003
15-02 15:53:06  [MLD] sendCode(): M84 
15-02 15:53:06  [MLD] extractGCodeInfo()
15-02 15:53:06  [MLD] readCode(): 'ok Q:128'
15-02 15:53:06  [ABD] printNextLine(): 2000/2003
15-02 15:53:06  [MLD] sendCode(): G90 
15-02 15:53:06  [MLD] extractGCodeInfo()
15-02 15:53:06  [MLD] readCode(): 'ok Q:128'
15-02 15:53:06  [ABD] printNextLine(): 2001/2003
15-02 15:53:06  [MLD] sendCode(): M140 S70
15-02 15:53:06  [MLD] extractGCodeInfo()
15-02 15:53:06  [MLD]   (extractGCodeInfo) targetBedTemperature_: 70
15-02 15:53:06  [MLD] readCode(): 'ok B:70'
15-02 15:53:06  [ABD] printNextLine(): 2002/2003
15-02 15:53:06  [MLD] sendCode(): M117 Done                 
15-02 15:53:06  [MLD] extractGCodeInfo()
15-02 15:53:06  [MLD] readCode(): 'ok Q:128'
15-02 15:53:06  [ABD] printNextLine(): 2003/2003
15-02 15:53:06  [ABD] resetPrint()
15-02 15:53:06  [ABD] setState(): 5:printing > 3:idle

[peteruithoven]

Craftbot

(Using Pronterface)

Marlin default start gcode

Set nozzle target temperature
M109 S{printingTemp}
Response: ok Q:128
Set target bed temperature
M190 S{printingBedTemp}
Response: ok Q:128

marlin default end gcode

Set nozzle target temperature
M104 S{preheatTemp}
No response...
Set target bed temperature
M140 S60
Response: ok B:50
(Looks like it responds with current bed temperature)

Marlin preheat / heatup command:

Same g-code as start gcode.

Regulier commando, zoals G21:
Response: ok Q:128

Ultimaker2

(Using p3d on WiFi-Box because of baudrate)
G21
Response: ok
M109 S180
Response: ok
M104 S180
Response: ok

So sending M104 S... (Set extruder temperature (not waiting)) doesn't give a response, even though sending a M140 S... does. We need to figure out how to cooldown this printer.

[peteruithoven]

Quick options:

• Putting that M104 command at the end. But then it sticks in printing state which means you can only press stop. After pressing stop it sticks in stopping mode. So not really an option.
• Using waiting command (M109) instead, users will have to wait for it to cooldown to preheat temp before it can start heating up for a next print.

I'll check if the Craftbot software uses a special cooldown gcode command.

[peteruithoven]

The g-code from CraftWare ends with:

G21 ; mm
G90 ; abs
G92 E0 ; reset extr
M106 S255
G0 F4800 X38.071 Y106.733

G0X0Y0

M104 S0 ;turn off head heater
M140 S0 ;turn off bed heater
M106 S0

So this uses a regular M104 S...(The M106 is the fanspeed)
It's also followed by ;CraftWare_Settings=... but that isn't relevant.

[peteruithoven]

Sending M104 S0 also gives no response.

[companje]

A workaround for now would be to use an M109 S180 in Doodle3D's end-code for the CraftBot.
I will contact CraftUnique so they can fix the issue of the lacking OK response after M104.

[companje]

I got a response from CraftUnique. Their experiment shows that M104 S180 returns 'ok T:21' which is not according to the RepRap specs but still it does return something. I confirmed this by connecting the CraftBot to my Mac and opening the Arduino IDE's Serial Monitor. It gives this response indeed when using the correct line-endings (LF).

[companje]

Interesting: Sending an M104 S180 from Printrun does not give a response.
Sending the same from Arduino (or from Processing) returns ok T:21. The response I receive in Processing is correctly followed by a line-feed.