Ender 3 - How to fix Z-axis binding
Summary
TLDRこのビデオでは、3Dプリントの際に遭遇する可能性があるZ軸バインディングの問題とその解決策についてTom Tullisが解説します。Z軸バインディングは、プリントヘッドがZ軸スクリューに沿って上に移動しようとする際に、滑らかに動かないことで発生します。これにより、レイヤーが適切に積み重ねられず、モデルが意図したよりも短くなることがあります。ビデオでは、スクリューの汚れや潤滑の問題、ブラスカプラーの調整、エキセントリックナットの締め付け具合、モーターの取り付け位置の調整、そして柔軟なシャフトカップリングの使用など、複数の解決策を提案しています。これらの手順を実行することで、Z軸バインディングの問題を効果的に解決し、品質の高い3Dプリントを実現することができます。
Takeaways
- 🔧 Z軸バインディングとは、プリントヘッドがZ軸スクリューを上に移動しようとする際に、何らかの理由で滑らかに移動できず、レイヤーが正しく積層されない問題を指します。
- 🐉 例として挙げられたドラゴンロックタイルは、Z軸バインディングの影響で、モデルの一部が圧縮され、本来の高さより短くなってしまうことを示しています。
- 🛠️ Z軸スクリューが汚れていることが、バインディングの最も一般的な原因であるため、最初に清掃と潤滑を試みるべきです。
- 🔩 X軸ブラケットに取り付けられた真鍮製カップラーのネジを適切に調整することで、Z軸の微妙な傾きや曲がりを補正し、バインディングを解消できます。
- 🎚️ X軸キャリッジの偏心ナットが過剰に締め付けられていると、バインディングが発生しやすくなるため、適切な調整が必要です。
- 📐 Z軸モーターの取り付け位置が適切でない場合、スクリューが傾いてバインディングの原因になることがあります。
- 🛑 モーターとフレームの間に隙間がある場合、シム(洗濯機や硬貨など)を使用してギャップを埋め、スクリューを垂直に保つことが解決策となります。
- 🔄 Z軸スクリューが曲がっているか欠陥がある場合、柔軟なシャフトカップリングの使用が推奨されます。
- 💡 柔軟なシャフトカップリングは、プリント品質を向上させる安価なアップグレードであり、Z軸バインディングの問題を解決する可能性があります。
- 👍 このビデオは、Z軸バインディングに関する問題の診断と解決策を提供し、3Dプリンティングの品質を向上させるための実用的なアドバイスを提供します。
Q & A
What causes z-axis binding?
-Z-axis binding is caused when the x-axis assembly with the print head cannot move smoothly up the z-axis screw, resulting in compressed layers.
How can you identify z-axis binding in a print?
-Signs of z-axis binding include a squished or widened base, layers that are more compressed than they should be, and an overall shorter model height.
What is the first thing to check for z-axis binding issues?
-The first thing to check is that the z-axis screw is clean and properly lubricated, as accumulated debris can cause binding.
How can the coupler screws help with binding?
-Loosening the coupler screws allows the coupler to shift and accommodate any tilt or bend in the z-axis screw, preventing binding.
How does eccentric nut adjustment help binding?
-If the eccentric nut is too tight, it can cause the x-axis to tilt as it moves, creating drag and binding on the z-axis.
What indicates a z-axis motor alignment issue?
-If the z-axis screw doesn't easily drop through the x-axis and hit the floating z-motor assembly, there is likely a mounting alignment issue.
How can z-axis motor misalignment cause binding?
-Misalignment angles the z-screw and causes binding. Shim washers between the frame and motor can help realign to correct this.
What other hardware can cause z-axis binding?
-A bent z-axis screw itself can also cause binding even with proper alignment.
How can a flexible coupler help with binding?
-A flexible coupler accommodates any slight bends in the z-screw, preventing binding.
Why add a flexible coupler even without binding issues?
-Flexible couplers allow for minor flexibility that can increase print quality.
Outlines
😟 Issues with z-axis binding
The paragraph discusses issues with z-axis binding in 3D printers, which causes layers to be compressed. It shows an example of a squished 3D print caused by the print head not moving up properly.
😃 Fixes for z-axis binding
The paragraph provides solutions for fixing z-axis binding issues. It suggests checking the z-axis screw, adjusting the coupler screws, ensuring the eccentric nut is not too tight, and aligning the z-axis motor.
👍 Flexible coupling solution
The paragraph recommends using an inexpensive flexible coupling piece to resolve z-axis binding issues. It fits between the motor and z-axis screw and allows for flexibility.
Mindmap
Keywords
💡z-axis binding
💡layer height
💡loosening coupler screws
💡eccentric nut adjustment
💡z-axis motor alignment
💡flexible shaft coupling
💡shimming
💡bent lead screw
💡squished layers
💡dirty lead screw
Highlights
Z-axis binding happens when the print head can't move smoothly up the z-axis, causing compressed layers
First thing to try is loosening the z-axis coupler screws to allow the coupler to shift and accommodate issues with the screw
Also check the x-axis carriage eccentric nut and make sure it's not too tight, causing tilt and binding
Can test z-axis motor alignment by removing motor screws and seeing if coupler lines up properly with no play
If misaligned, add shims between motor and frame to keep screw perfectly vertical
Flexible shaft couplers are a great upgrade that can fix most binding issues
Transcripts
hey everybody my name is tom tullis this
is the tomb of 3d printed horrors
and today we're going to take a look at
z-axis binding
now what is that well basically z-axis
binding is when your x-axis assembly
that has your print head on it
is trying to move up on the z-axis screw
for every subsequent layer after the
first
and at some point it's sticking
it's not able to move up that screw
smoothly
so you get extra compressed layers
because it's not moving up the full
layer height for each layer so the
plastic is getting squished more and
your overall model will be shorter than
what it was supposed to be
so what we're looking at here is a
dragon lock tile uh that we do here at
fat dragon games and this was done
on a brand new
ender 3 v2 that i just assembled
and i looked at the print and for the
first few millimeters there it's getting
z-axis binding that's why it's looking
squished out there
the print head is not moving up enough
to allow all of the plastic that is
allocated for that layer to come out
cleanly
so since there is essentially too much
plastic for the amount of height that it
is moving up the plastic is squishing
outward and that's why you're getting
uh that wider base for the first
however i guess it's about three
millimeters or so
and then it's getting past the binding
and able to move up the full amount it's
supposed to so then it levels out and
the layers look like they're supposed to
so
this can happen at any point you could
have the first two or three inches of a
model look great and then have z-axis
binding because of the issue with the
screw or the screw being dirty or
being
you know the
screw bent or something like that
but we'll take a look here at some real
easy fixes for z-axis binding
and then finally at a part you can buy
for your under three that will fix
pretty much every issue with binding
now before we get into the various fixes
for z-axis binding i want you to take a
look at your z-axis screw
the simplest and most common cause of
problems with the screw is that the
screw itself is dirty
if it's properly lubricated
um
you're going to attract dust and dirt
and small bits of
filament on it and these can build up
and cause binding so before we get into
any of the other fixes i'm going to talk
about in this video
take a look at your screw make sure
there's no dirt or debris in it and if
there is just clean it off with an old
toothbrush and apply a little more
lubrication and see if that resolves it
so to get started with here the first
thing if you're experiencing this i want
you to do
is make sure that the two screws that
attach the brass coupler for the z-axis
screw
to the x-axis bracket tighten these down
fully
and then loosen them each two full turns
you want them loose
what this will do is allow that coupler
to shift as necessary to accommodate
slimes uh in that z-axis screw mounting
if it's tilted a little bit or if
there's a little bit of bend to the
screw
will
compensate for that and make the ender
work normally and you won't have any
more issues with z-axis binding
this one
and i recommend everybody do this
whether you are experiencing z-axis
binding or not keep these two screws
if you're not having any issues about
one and a half turns loose if you are
having some issues keep them about two
turns loose i do this on all of my
machines
and it really helps a lot
the next thing you should look at is the
eccentric nut
for the x-axis carriage on the
right-hand side of the x-axis assembly
if this is too tight
what it's going to do is make this end
lag so the opposite end actually goes up
and down the screw is going to move up
this side is not going to want to move
evenly with it and you'll get tilt and
drag with it and that can cause binding
so make sure
if you're not sure how to adjust these
go look at my ender 3v2 build video
there's a section in that on how to
properly calibrate
and tune your eccentric nut wheels so
check that out make sure this is not too
tight
now if these two things did not solve
your z-axis binding we're going to have
to take a look now at the actual
mounting of the
z-axis motor
and we're going to see if it's aligned
properly or not to do this the first
thing i want you to do is loosen this
top screw on the coupler that holds
uh the z-axis screw to the motor
loosen this to where the you can
actually lift out the
screw
next up we're going to do the exact
opposite of what i told you a few
minutes ago i want you to tighten these
two
coupler screws up
you do not want any wiggle in the brass
coupler here you want it to be
completely tight
now you're going to remove the two
screws that hold the z-axis motor to
the vertical
frame of the printer you want to take
these screws completely out so that the
motor is free floating
once you have done that
i want you to take the x-axis assembly
and
drop the screw through it downward until
it hits the motor and remember your
motor is free floating now it's not up
against that rail
what you're wanting to do is see if the
motor assembly lines up with the screw
when the screw has no play because
you've tightened the two nuts on the
coupler
it should drop straight down
and hit the coupler for the motor mount
with the motor mount uh pushed against
the vertical extrusion frame so it
should look like this
if it doesn't
if
to get it to line up you have to move
your motor away from the frame
this is likely your problem what's
happening
is that
bracket that i'm showing here in green
is probably bent wrong
or the
cut out for the coupler at the top is
misaligned or something and that's
causing the alignment to make your
z-axis motor
for everything to be aligned it's going
to end up being away from your frame in
there you're going to have a gap
so what's going to happen is when you
mount your motor to the frame it's
causing that z-axis screw
to be at an angle as you're showing here
it's toeing in at the bottom and moving
away from the frame at the top
and that's what's causing your z-axis
binding so the easy fix for that
is to simply put a shim in between the
motor and the frame and that will keep
your screw perfectly vertical
that shim can just be a couple of
washers
between the motor mount and the frame
where the two screws mount it to the
frame
i've seen people use like dimes or
quarters just in between the motor and
the frame too that works it just depends
on how big your gap is but you want to
get it to where your screw does not have
that
that angle to it you want it vertical
um
if that's not the issue if your motor is
still aligned
it could be that your z-axis screw
itself is slightly bent or has a defect
in it
um
i've only had this issue with one of my
original ender 3's
and the way to get it to go away is use
a flexible
shaft coupling for the z-axis screw
now i love these things they are
absolutely fantastic and i put them on
all of my enders now whether they have
an issue or not
simply because i really do believe there
is a slight bump in print quality having
this flexible coupler
they're not super expensive you can get
a two pack for about 12.99 so it's about
six dollars and fifty cents
per printer to put these on
um
it's not a huge investment for the print
quality boost i really do recommend them
if you get these
if you look at this the ones you want
are the
five millimeter to eight millimeter
because it's a different size hole on
each side the five millimeter hole is
for the shaft on the motor the eight
millimeter hole is for the z-axis screw
and as you can see here this is all it
is looks like when it's installed it
just replaces the stock coupler that
comes with the printer
the only uh
the stock coupler that comes with the
printer does allow for a very minor
amount of flex but nothing close to what
this does with the rubber insert so
if z-axis binding is something you are
experiencing and the things i've
mentioned earlier in this video don't
resolve it odds are this will and
again it's it's a cheap upgrade and it
really does help a lot so
that's it that covers all the things you
can do for axis binding
please click those like and subscribe
buttons and thank you for watching
you
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