Strange messages out of the print console

General LulzBot Mini
1 
< Bed x: 0.00 y: 0.00 z: -1.24
< Bed x: 160.00 y: 0.00 z: -1.23
< Bed x: 160.00 y: 160.00 z: -1.30
< Bed x: 0.00 y: 160.00 z: -1.21
< Eqn coefficients: a: -0.00 b: -0.00 d: -1.22
< planeNormal x: 0.00 y: 0.00 z: 1.00
< Probing done!
< echo:endstops hit:  X:0.01 Z:-1.21
< Error:No Checksum with line number, Last Line: 54
< echo:Active Extruder: 0
< Error:No Checksum with line number, Last Line: 84
< echo:Unknown command: "9"

I’m wondering what is causing the “Error:No Checksum with line number, Last Line: 54” and the “Error:No Checksum with line number, Last Line: 84” I’m using the ‘Fast low quality print’ with PLA in cura on a ubuntu 14.04. I don’t always see this message but it occurs often enough that I thought I’d ask about it. I’m not sure if the gcode parser counts comment lines?

54 is:

G1 Z2 E0 F75                 ; extrude filament back into nozzle

and

84 is:

G1 F600 E13.46385

The print came out fine. I wasn’t watching the action of the head to know if it retracted.

-rick

2

Cura sends a lot of information to the printer at once, rather than one line at a time (like pronterface). Some other printer hosts will wait for an “OK” before sending the next line of gcode. It shouldn’t affect your print as the commands are being sent, but the acknowledgement/handshake isn’t being received.