<p>Is the firts time that I saw this movement after the printing has finishig and causes the nozzle crashes to the printed part and I noticed due the part is 14x8 and the nozzle is to near and below to the border of the shape. I supposed that some scripts has changed but, seems to be everything ok.</p>

<p>this is the end script:</p>

<pre><code>G92 E0
G1 E-1.5000 F1800
; layer end
M104 S0 ; turn off extruder
M140 S0 ; turn off bed
G28 X0  ; home X axis
M84 ; disable motors
; Build Summary
;   Build time: 3 hours 9 minutes
;   Filament length: 12689.1 mm (12.69 m)
;   Plastic volume: 30520.78 mm^3 (30.52 cc)
;   Plastic weight: 38.15 g (0.08 lb)
</code></pre>

<p>Z axis moves down 4mm after finishing going to X0, why? I don't want the nozzle crashes the part on going to zero.</p>

[{'answer_id': 5528, 'author': 'mac', 'author_id': 9134, 'author_profile': 'https://3dprinting.stackexchange.com/users/9134', 'pm_score': 4, 'selected': True, 'text': '<p>You can use:</p>\n\n<pre><code>G91\nG1 Z10\n</code></pre>\n\n<p><code>G91</code> make the printer use ralative positioning, while <code>G1 Z10</code> would move the gantry up of 10mm, reagrdless of its actual position.</p>\n\n<p>In order to understand what\'s going on, you could experiment with the position of those lines in the script.</p>\n\n<p>The safest bet it to insert them at the very top, but you could insert them straight after the homing of the X axis to understand if the drop you are seeing is caused by the homing command itself or by the ´M84´ one.</p>\n\n<p>My <em>guess</em> is that the drop is actually caused by the latter.  <code>M84</code> doesn\'t really "disable motors", rather it stops using energy to keep them still (i.e.: it stops the <em>idle hold</em>).  What I believe is happening in your case is that when you stop the idle hold, the weight and mechanical play of the X gantry causes it to move slightly (a bit like when you relax your body on the sofa and you "sink" in it a bit more).</p>\n'}, {'answer_id': 5531, 'author': 'Carl Witthoft', 'author_id': 2191, 'author_profile': 'https://3dprinting.stackexchange.com/users/2191', 'pm_score': 2, 'selected': False, 'text': '<p>There is something fundamentally wrong with your z-motor drive if both screws are dropping the gantry at all.</p>\n\n<p>Try a couple experiments.<br>\n Write a quick script to move the head somewhere up high, then terminate without the X-homing command.  See if the z-axis moves.  Ditto for X-home but not motor disable. </p>\n\n<p>Write any script, and while the gantry is up high, pull power and see what happens.</p>\n\n<p>That will at least help narrow down the list of possible problems.   In the meantime, please post your printer, the motors, and the driver board/firmware in use.</p>\n'}]
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