Hello, my name is Igor and in my previous video I was
testing the optimal position for 3d printing of the bolts and
This time I will repeat the experiments but now with the screw nuts
I want to clear this question
because I am preparing a test where I want to measure how strong our 3d printed nuts for M3 to
M12, but first I have to clear this very important question. What is the optimal position for
3d printing inner treats or
nuts?
Conventional Horizontal position
or maybe the printing in vertical position will result a stronger nut
Of course if you need a standard nut is much better to use the metallic versions
But with this method you can have the thread part of your 3D printed object
Optimal position for threats is the vertical because we don't need a support but with the bolts, it was obvious that
printing in horizontal position will result much stronger bolt, but unfortunately there we need a supports
I believe the  case will be a little bit different with
screw nuts but, let's find out together. I measure two things. I measure the torque and
also, I will measure the
Pulling force where, actually, for the screw nut
It will be a shear force, but you will see soon. I print M6 and M10 screw nuts
And I will print them: one will be in horizontal
the other will be in vertical position, but I will print both without any supports
It is possible specially with the smaller nuts. There is a one very critical point
Before this bridging, because overhang here may be too big but with small holes, it's usually not a problem
Bigger the hole, bigger is the overhang. So here will be very critical point on this size
Before this bridging, so this is extremely big overhang
Reducing the layer height
You can have bigger overhang angle
You can have an additional cooling will help too or reducing the printing temperature. But with that your layer adhesion will be
Weaker, so here with the nuts, we will need really strong layer attention too and
as you can see
I used 100% infill and a lot of parameter (6 parameters) because I want this nut here to print it fully (almost)
with 100% infill, but with parameters, so theoretically this should result the the strongest nuts
Print it was very quick
I use only one and a half meter of filament for this printing and it was finished in less than one hour
Now you can see the finishing the hole on M6 nut it was covered by bridging without any problems
And now let's see those critical points on this printing
And there is the closing the hole on M10 nut and
as I expected this overhang is really critical and
You can see it has some problems
But at the end it finished the printing properly
In my experience I can print properly the threads up to M12 without any supports
But it really depends of your printing material and your maximal overhang angle
so this nut printed in horizontal position looks really perfect straight from the 3D printer and
this printed vertically
It looks OK except on that position where the hole was closed
by the printing but it can be cleaned with the metallic bolt or with the tap tool
This is just a washer
Vertical position
I will show my full torque test here because
It's starting with a tightening of the nut to the metallic bolt
But don't forget you can always jump to the results if you don't want to see all or you
Can use the timestamps to see for example the pulling test if you would like to
3.8
4.3
ups, something happened
Yes, it's broken
Okay, let's see how it broke
So it pulled out the thread
Okay, now, let's see the horizontal version which was printed in this position
Again started with the tightening the nut to the metallic bolt, and this was really different.
I can tell this one is I feel stronger 4.7, 5..
5.4
Much better really 6, 6.3
Wow, it's very hard to turn it 7.4
It's very hard to pull it
It's easier now a little bit, so something happened
Okay now it's broken
So again, the treat was pulled out
For this test I'm using M6 because they are smaller and I hope my weight will be enough to break these nuts
This is my measuring equipment, this is a hanging scale up to 150 kg and
If the nut fails, this part will fall down, but to avoid to fall into my head
this strap will hold it I
I had several comments in my previous video that this looks dangerous. And yes, maybe watching the video
It looks like it's not too safe, but I didn't feel that it is a so risky
So here is the thread
Of course I'm working on better solution
And also I'm building an Arduino based tensile testing machine, but until that I have to finish these experiments. I am curious about the results
And in this table, I summarized the results as you can see the screw nuts 3D printed in horizontal position
Was better in both tests, and also it will be easier to 3d print it in any size
but I was surprised a little bit with the difference on pulling test and
When I analyzed the test probes I can see that thread on the horizontal nut was sheared out
it's not there anymore (almost) but with the vertical position, the thread is still inside and
when I analyzed the
Slicer I can see with this size (M6), the thread has only one parameter
So there is no material behind and it will easier deform so properly that's the reason why it performs so weakly on pulling test
I'm very happy with this result because 3D printing
Screw nut in the horizontal position
Will result stronger thread compared to the vertical position and this is the conventional methods for to the 3D printing threads
So if you need an inner thread as part of your object, so this is the optimal position
Unfortunately with the bolts that's not the case. So here
the stronger bolt is
Printed in horizontal position but there we need a lot of supports check my previous video
very interesting results I got there so
Now I'm ready to create some
Test from M3 to maybe M12. I will see what can I measure and of course I will rebuild this
testing machine. I'm building one tensile testing machine based on Arduino
But it takes time for parts to arrive from China
Now I have to give back this stand to the original owner
