Strange printer behavior - what to do?
After performing an Auto-Home function, when I begin a print the printer makes a "jump" before it moves the printhead down to the printbed. The jump is really more of a jerk type movement that it never did before. The net result is the printhead ends up in the wrong place (too close to the printbed) to extrude properly.
It seems that the jump motion causes the printer to lose track of its vertical position, but I can't figure out why it has started doing this for no apparent reason.
To deal with this I have reloaded the printer firmware (twice), spent a lot of time with Z-offset, verified all the mechanical parts of the printer are ok, etc. The problem happens with both Craftware and Simplify3D, so I don't think it is a GCode problem.
This is the beginning of the S3D GCode:
G90
M82
M106 S0
M104 S190 T0
M109 S190 T0
G28 ; home all axes
;G29 Z+0.6 ; AutoCalibration
G1 F5000 Z50 ; lift nozzle
G0 X0 Y0 Z50 ; parking
G92 E0
G1 E-3.0000 F9000
and this is the CW:
G28 ;Home
M109 S200 ;set and wait head temperature
; ------------------------------------
; Layer #0
; ------------------------------------
G21 ; mm
G90 ; abs
G92 E0 ; reset extr
M106 S0
G0 F9000 E-3.0000
I guess there is some truth to the saying "It's always something."
翻譯年糕
Charlie Ting
2016-03-04 08:13:59
You may try to set Accel to 500 in ATOM panel, and set XY Travel speed to less 250. (200 is better).
That's so-called momentum problem, not a big deal.