nanoDLP

HencoReyneke

Member

Registered: 2018-08-06

Posts: 8

Faulty Z-axis movement after lift

Good evening all

I am in the final stages of completing my printer build which is a direct control, bottom up printer running build 4550. I attempted a test print but it failed miserably.

I have subsequently tried to figure out what went wrong and discovered that the build plate moves too far down after a lift move has been completed. My lift distance is set at 12 mm (9600 pulses). Upon completion the printer then attempts to move down 18.94875 mm (15159 pulses) instead of the 11.95 mm and triggers my bottom end stop. This occurs on each and every layer.

I have removed all the code in the "before layer" box of the resin profile but it still occurs. It appears to be a hard coded movement in the background code.

Below is the status line from the printer.

Any help to get the movement correct would be highly appreciated.

Debug    2    2021-09-15 20:58:14.9903    Pulsing    Moving Down 15159 pulses 18.94875 mm
Debug    2    2021-09-15 20:58:14.99026    Pulsing    Moving to Layer
Debug    1    2021-09-15 20:58:14.990201    Pulsing    Movement Finished Pulse 9600 / 9600 ; Height 371339 / 361739 ; Time 26.135017516
Debug    1    2021-09-15 20:57:48.85508    Pulsing    Moving Up 9600 pulses 12 mm
Notice    1    2021-09-15 20:57:48.855026    Gcode    Position change 12 to 464.173
Debug    1    2021-09-15 20:57:48.754671    Shutter    Shutter Close
Debug    1    2021-09-15 20:57:48.754424    Printing    Waiting after layer print 0
Debug    1    2021-09-15 20:57:48.754382    Image    Clear screen
Debug    1    2021-09-15 20:56:48.70381    Printing    Curing for 60.000002048 seconds
Warning    1    2021-09-15 20:56:48.696672    Image    Display layer public/plates/1/1.png
Debug    1    2021-09-15 20:56:48.185625    Shutter    Shutter Open
Debug    1    2021-09-15 20:56:48.185578    Printing    Waiting before layer print 0
Notice    1    2021-09-15 20:56:48.185489    Gcode    Position set to 476.172
Debug    1    2021-09-15 20:56:48.184882    Pulsing    Movement Finished Pulse 4000 / 4000 ; Height 376938 / 380938 ; Time 11.155271331
Debug    1    2021-09-15 20:56:37.029493    Pulsing    Moving Down 4000 pulses 5 mm
Debug    1    2021-09-15 20:56:37.029456    Pulsing    Movement Finished Pulse 376938 / 376938 ; Height 0 / 376938 ; Time 225.818266309
Debug    1    2021-09-15 20:52:51.211078    Pulsing    Moving Down 376938 pulses 471.1725 mm
Debug    1    2021-09-15 20:52:51.211045    Pulsing    Moving to Layer

Shahin

Administrator

Registered: 2016-02-17

Posts: 3,546

Re: Faulty Z-axis movement after lift

I guess it is something to do with layer thickness.
Also make sure you do not have missing pulse (lower speed and adjust amp on stepper driver)