I have a 3D printer model UNI-PRINT-3D from thecooltool.com which came 
along with the Sandy Box Lin-EMB.

Sandy Box has built in a machine-client application for communication with 
the printer. The communication looks ok. I can move the head of the printer 
by clicking on buttons on the machine-face screen. However, when I try to 
move the printing head to touch the bed surface it goes up until 1mm above 
and after that clicking buttons to move head down have no effect. 
The other problem is that when I upload and run g-code program it complains 
about 'A' command saying "Bad character 'a' is used".
Can anyone help, please?
here are the first few lines of the g-code program:
; generated by Slic3r 1.2.9 on 2016-11-09 at 19:11:08
; external perimeters extrusion width = 0.40mm
; perimeters extrusion width = 0.48mm
; infill extrusion width = 0.48mm
; solid infill extrusion width = 0.48mm
; top infill extrusion width = 0.48mm

M107
M190 P65 ; set bed temperature
M104 P205 ; set temperature
G28 ; home all axes
G1 Z5 F5000 ; lift nozzle

M109 P205 ; wait for temperature to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates

G92 A0
G1 Z0.400 F7800.000

Vitalije

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