How do I print a Y nozzle

wirlybird · 2017-08-17T16:35:12.000Z

What slicer, material, temps and speeds?

emilyc · 2017-08-18T00:37:41.000Z

Slicer: Repetier Host

Material: PLA

Extruder Temp: 200 C

Heated Bed Temp: 55

Travel Feed Rate: 4800 mm/ min

details.jpg1360×699 221 KB

wirlybird · 2017-08-18T11:00:57.000Z

Haven’t used Repetier so I’m no help there! It says it used Slic3r to generate the gcode? If so it looks like an old version so maybe an update is worth looking at.

Temp is pretty good. You might try going lower in 5 degree drops and see how the filament does but still pretty good at 200.

I would drop overall print speed to 30-35mm/sec or so. You will want slow to allow the layers to cool a bit especially on a smaller part.

If you have a part cooling fan make sure it is on after the first layer or so.

Is it really a .5 nozzle? How big is this part? It looks like it should be able to print ok. I think speed may be a factor.

chanman · 2017-08-21T01:23:51.000Z

Looks like you need a filament cooler, the layers are drooping before the next layer comes in, try slowing down the print speed.

emilyc · 2017-08-21T01:29:18.000Z

I will drop the overall print speed and see what happens.

So far I have not seen any problems with other printed objects, just this particular Y nozzle.

Thank you for taking time to reply.

emilyc · 2017-08-22T00:58:24.000Z

Hello!

I reduced the speed and this time managed to print a complete Y nozzle.

However there seems to be cracks. I have attached some pictures.

Any idea how to solve this?

Thank you:)

img_20170821_144002.jpg2608×4632 2.27 MB

img_20170821_144021.jpg2608×4632 2.3 MB

img_20170821_144041.jpg2608×4632 2.45 MB

img_20170821_144048.jpg2608×4632 2.19 MB

emilyc · 2017-08-22T00:59:31.000Z

Hello!

I have the fan running at all times. I have tried slowing the speed and increasing its thickness a bit.

Managed to print out a complete Y nozzle, but it still has cracks between joints.

wirlybird · 2017-08-22T11:03:22.000Z

You might increase the extruder temp a little for better layer bonding but not to much. Try 205 and see how it goes. I would measure the filament diameter in several spots and enter that average in the slicer. The horizontal lines may be a mechanical issue or the extrusion is off but one thing at a time.

That split in the middle could be the model and not the print. Not sure without looking into it more.

emilyc · 2017-08-24T07:56:49.000Z

The current extruder temperature is 205. I didnt increase it further yet.

I think the split is also due to the model, but I’m not sure how to improve it.

Thank you for your replies so far.

wirlybird · 2017-08-24T11:29:22.000Z

You may want to run the model through a fixer like Netfabb to see if it finds any issues.

chanman · 2017-08-24T18:15:55.000Z

I see the cracks, how did you create this model? Are you sure the model is 1 solid and not two solids “very close together” I have seen this happen on one of my prints where there was actually a very small gap where parts met. When this part was printing, did you watch the nozzle as it printed the upper portion of the part? did the nozzle print each side separately? if it went in a figure 8 pattern then the gap would not have been there.

Can you post the 3d model file (STEP will work) or the STL file?

emilyc · 2017-08-25T08:00:34.000Z

The nozzle printed both sides together, then towards the end, focused on one side and ending it before moving the other side.

I am attaching the stl file.

The stl file had some manifold problems which i then got it fix on netfabb.
y_nozzle_22_mm_fixed.stl (300 KB)

emilyc · 2017-08-25T08:02:00.000Z

Actually when i uploaded my initial stl into Repetier, it says object is not manifold and asked me to fix it using Netfabb.

I did and here’s the fixed stl file.
y_nozzle_22_mm_fixed_0.stl (300 KB)

wirlybird · 2017-08-25T11:18:16.000Z

I’ll give it a try this afternoon if I get a chance. Curious to see how it does since it does!

wirlybird · 2017-08-26T02:18:10.000Z

Ok, after taking a look at this file what you have is basically three tubes that are together but not joined. There is a gap in between them. Here is a pic of it in my slicer. You can see the gaps. Ignore the grey stuff.

1_22.jpg1446×788 469 KB

chanman · 2017-08-26T15:13:21.000Z

I saw this also when importing this into Inventor.

emilyc · 2017-08-28T01:35:01.000Z

Thank you for looking at my file.

It means that there is a problem with my drawing, right?

Actually, I’m a newbie in drawing too. I drew the nozzle following a guide on youtube.

So if someone can tell me what is wrong and how to correct the drawing I’d be grateful:)

Thank you.

chanman · 2017-08-28T12:50:08.000Z

You can see the problem in Fusion 360, go to Inspect, Section analysis pick a face (I used one of the top faces) and then drag into the model, once you get to the intersection, you will see the outer wall is connected but the internal is split open

capture_spit.png1030×1191 207 KB

chanman · 2017-08-28T13:00:49.000Z

Here is a quick model made in inventor of your nozzle, the dimensions are not exact, hard to take measurements of a mesh model. Steps are create the lower cylinder, draw a line from the center at an angle, draw a rectangle and use the line as an axis of revolution, repeat. Perform a Shell operation, finish.
y_nozzle.stl (101 KB)

emilyc · 2017-08-29T00:47:04.000Z

Hi Benson,

Thank you for taking the troubling to check my drawings.

I’m sorry I don’t really understand the steps you took to make the Y nozzle using shell command.

1. Drew a Y

2. Drew a circle OD: 31 mm, followed by a hollow extrusion - done for each plane

3. Trim

4. Thicken surface: 1 mm (in my previous stl file I did 2 mm)

5. Directly print to stl

If you don’t mind, I have done a step-by-step how I drew the nozzle in Inventor.

I am beginning to suspect if my trimming is incorrect.

If you have time, appreciate if you could tell me where I did wrong.

Thank you so much.
y_nozzle.pdf (244 KB)