Perfect Z Offset On Your 3D Printer - How to get it right! — Transcript

Full transcript

1. 0:00this video is sponsored by f3d m so you know that  you need to tune your Zed offset for perfect first
2. 0:06layers but how do you know when it's right in this  video I'll quickly show you what you're looking
3. 0:10for when you're trying to dial in your Zed off  set with examples of what you might be seeing on
4. 0:14your 3D printer so you know what to do to improve  things at the end I'll also address some commonly
5. 0:20asked questions about Zed offset and give you some  answers I won't go into too much detail about what
6. 0:25Zed offset actually is I have another video for  that which I'll link to at the end of the video
7. 0:30and in the description below in very basic terms  adjusting your Zed offset moves the nozzle nearer
8. 0:36or further from your bed while printing what I  like to do after setting the Zed offset during
9. 0:41the bed leveling process is to then fine-tune it  by printing something with a large footprint and
10. 0:47adjust the Zed offset in small increments while  watching the filament laying down I should say
11. 0:52here that this will only fully work on a 3D  printer that has a bed probe and allows a zed
12. 0:58offset adjustment while printing however knowing  what a good first layer looks like is important
13. 1:03to make any adjustments to put it right even if  you can't adjust in real time and have to print
14. 1:08and adjust a couple of times to dial it in to give  examples of what you're looking for I've printed a
15. 1:13number of the single layer 60x 60 mm squares with  different Zed offsets I also now have a digital
16. 1:20microscope so I can show you some nice close-ups  of what's going on so first off let's look at far
17. 1:26too close now the first thing that I should say  is the ual Zed offset figure getting bigger or
18. 1:32smaller is relative on all the 3D printers I  have the Zed offset figure goes into negative
19. 1:37values as the nozzle gets closer to the bed you  might say that this is a bigger Zed offset even
20. 1:43though the number is getting smaller this can  be very confusing so first of all make sure you
21. 1:48understand which direction your nozzle goes up or  down when you ask for a bigger or smaller Z offset
22. 1:55I'll try to avoid these terms to save confusion  and instead just refer to your nozzle being closer
23. 2:00or further from your bed while printing your  first layer and whilst I'm printing multiple
24. 2:05squares to demonstrate if you're quick enough you  can usually dial your Z offset in with just one
25. 2:09print so too close in the extreme the nozzle  actually touching the bed while printing will
26. 2:15block the nozzle and stop filament being extruded  some have confused this with a block nozzle end up
27. 2:20seeking advice for the wrong original issue  also if your nozzle is actually scraping on
28. 2:25the bed then it's very likely to cause damage to  your bed nozzle or probably both if at any point
29. 2:31you notice your nozzle touching your print surface  while printing cancel the print straight away and
30. 2:36then go back to your printer Z offset process and  try again something definitely isn't right if it's
31. 2:41actually touching while printing assuming that  you're getting some filament extruding having the
32. 2:45nozzle too close to the bed will cause filament  to be squeezed wider than intended and then too
33. 2:50much overlap as the next adjacent line is printed  this will cause filament to be pushed up in areas
34. 2:56and will leave a very rough surface if the nozzle  doesn't dislodge filament that's already been laid
35. 3:01down either way this is what you'll see if your  nozzle is too close the microscope image really
36. 3:06shows this well I got this microscope from Amazon  it comes with different lenses for different
37. 3:11magnification levels as well as some slides with  some interesting things to look at in close detail
38. 3:16I'll put a link in the description if you want to  have a look for yourself no pun intended as we get
39. 3:21closer to the correct Z offet the surface that is  left becomes a little smoother but there are still
40. 3:27areas where things are clearly not smooth yet so  we need to raise the nozzle some more all of the
41. 3:31filament used in this video was supplied by our  sponsor F3 DM who have just released their brand
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51. 4:26for all of you wanting multimaterial printing  check out their full range from the links in
52. 4:30the description below if your nozzle is too far  from your bed then in the extreme the filament
53. 4:35won't even stick and instead will just be dragged  around the bed making a mess as you get closer
54. 4:41you may start to see some areas sticking but then  other areas where the nozzle or parts of cooling
55. 4:45ducts touch raised areas and dislodge them it's  usually quite easy to see here that the nozzle
56. 4:51is too far from the bed the real ta tail of when  your nozzle is too far from the bed even though
57. 4:57the entire print is sticking is gaps between  adjacent lines when the print is removed it's
58. 5:02really easy to see that lines of filament that run  alongside each other not stuck together however
59. 5:07it's not always that obvious as the first layer  is printing especially if your print surface and
60. 5:13filament are the same color a torch or the light  on your phone can be really useful for detecting
61. 5:19these gaps but another Telltale of the nozzle  being too far away is raised Corners finally
62. 5:25this is what a first layer should look like with  a perfect Zed offset the there are no gaps between
63. 5:30lines of filament and there are no raised areas  when the print is removed we can see that we have
64. 5:35one single sheet of plastic with no gaps now we've  dialed in a perfect Zed offet let's answer some of
65. 5:40the most common questions around Zed offet that  cause confusion do you need to change your Zed
66. 5:46offset for different layer Heights no you don't  adjusting the Zed offset moves the whole Zed AIS
67. 5:53up or down if you have a first layer height of  say 0.2 mm then the printer will will raise the
68. 6:00nozzle 0.2 mm before printing the first layer  if you change the first layer height then the
69. 6:05printer will just move the nozzle to that height  and then extrude more or less filament to achieve
70. 6:11the correct Extrusion needed do you need to change  your Zed offset for different filament possibly
71. 6:18some filament like PG can be extremely sensitive  to a perfect Zed offset PG can be really sticky
72. 6:25and any filament that touches the side of the  nozzle is very likely to be stretch like chewing
73. 6:30gum and leave thin strands all over your print if  your nozzle is even slightly too close then any
74. 6:36filament that's squeezed out will stick to the  side of the nozzle in this case it's sometimes
75. 6:40better to raise the nozzle with Z offset so that  it's very slightly on the high side of perfect
76. 6:45with pla in contrast some other filaments like to  be pushed into the print surface more as they are
77. 6:51naturally less sticky I found some abs and ASA  to be like this and a slightly closer nozzle can
78. 6:57help do you need to chck change your Z offset  for different print surfaces again possibly if
79. 7:04you use my examples in this video then you'll know  what you're looking for and can tune your Z offset
80. 7:08accordingly with rougher surfaces the nozzle  will probably want to be a little bit closer
81. 7:13as the filament can be squeezed into any dips in  the surface again though you're still looking for
82. 7:18that smooth top surface with no gaps does an  incorrect Zed offset cause the nozzle to hit
83. 7:24infill higher up in a print no depending how high  up you go some people get the wrong idea about Zed
84. 7:32offset and believe that reducing your Zed offset  so that the nozzle is 0.1 mm closer while printing
85. 7:38the first layer also means that every layer will  be 0.1 mm shorter in height this is not the case
86. 7:45think of the Zed axis like a ruler when you change  the Zed offset you're moving that whole ruler up
87. 7:51and down not changing the scale of the ruler  if you have a zed offet which means that the
88. 7:57nozzle is too close to the bed and you get a a  rough surface on your first layer this can then
89. 8:02be translated to the layer above however after  a few layers it's very unlikely you'll see any
90. 8:07further effects except for maybe some stringing  because of filament that's stuck to the side of
91. 8:12the nozzle can I adjust my Zed offset if I don't  have a bed probe possibly the important thing to
92. 8:19work out is how your printer knows where the  bottom of the Z AIS actually is for example
93. 8:25before I added a bed probe to my ender3 version  2 it had a mechanical switch to tell the printer
94. 8:31where z0 should be if I wanted to raise the  whole Z AIS then I could adjust this said
95. 8:38limit switch up it's not always very easy to do  though and you're usually much better off paying
96. 8:42attention when tramming your bed to set your Zed  offset as accurately as possible there's a video
97. 8:48Linked In the description which shows the best  method I found for tramming your bed with this
98. 8:53kind of setup if you're having problems getting  your first layers to stick reliably then check
99. 8:58out this video which gives you seven different  factors that can affect first layer adhesion
100. 9:03with fixes or if you find that you're constantly  having to relevel your bed check out this video
101. 9:08which will give you some more things to try  don't forget to hit subscribe if you don't
102. 9:11want to miss out on any future videos too thanks  for watching and I'll see you in the next one