Notifications
Clear all

New Member, new to 3D printing, first Benchy  

  RSS
adiamant
(@adiamant)
Active Member
New Member, new to 3D printing, first Benchy

Hi!

I just finished the assembly of my MK3S, I did the calibration and printed the Benchy included in the SD card.

I need your help here, I really don´t know if I am having printing issues or if the result is what it should be. I kindly ask you to look at the pictures and let me have your opinion.

Many Thanks!

Posted : 12/08/2019 3:40 pm
Milos V.
(@milos-v)
Prominent Member
RE: New Member, new to 3D printing, first Benchy

For sure, your first layer calibration is definitelly bad (your first picture). Use live z adjustment to correct it. The nozzle has to go lower.

Posted : 12/08/2019 3:45 pm
adiamant
(@adiamant)
Active Member
Topic starter answered:
RE: New Member, new to 3D printing, first Benchy

Thanks a lot for your reply, when doing the first layer calibration I was going after a slightly round upper profile of the extruded string. As it is, it still looks a bit squished to me, anyway, I´ll go lower.

Do you think the first layer calibration is to blame for the problems shown in the other pictures?

Thanks again!

Posted : 12/08/2019 3:55 pm
JoanTabb
(@joantabb)
Moderator
RE: New Member, new to 3D printing, first Benchy

Welcome to the group, 

I am fairly confident that the first layer issues are not responsible for the other issues, 

Have you checked your belt tightness?on X and Y axis?

Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 12/08/2019 4:02 pm
Milos V.
(@milos-v)
Prominent Member
RE: New Member, new to 3D printing, first Benchy

First layer has to be solid and smooth, you have it like a set of individual lines. First layer is a basic, it can cause many troubles.

The "ghosting" issues might have a lot of reasons, I would gues belt tension. Have you read this: https://blog.prusaprinters.org/does-your-freshly-assembled-original-prusa-i3-mk3-print-as-the-best-it-can/

Very helpful...

Have you applied any mods, like vibration dampers?

Milos

Posted : 12/08/2019 4:05 pm
adiamant
(@adiamant)
Active Member
Topic starter answered:
RE: New Member, new to 3D printing, first Benchy

I have checked the belt tightness but the criteria is a bit subjective.

Judging by the pictures, do you think the belts might be loose or tight, that would help me a lot.

Cheers!

Posted : 12/08/2019 4:08 pm
adiamant
(@adiamant)
Active Member
Topic starter answered:
RE: New Member, new to 3D printing, first Benchy
Posted by: milos.v

First layer has to be solid and smooth, you have it like a set of individual lines. First layer is a basic, it can cause many troubles.

The "ghosting" issues might have a lot of reasons, I would gues belt tension. Have you read this: https://blog.prusaprinters.org/does-your-freshly-assembled-original-prusa-i3-mk3-print-as-the-best-it-can/

Very helpful...

Have you applied any mods, like vibration dampers?

Milos

When doing the First Layer Calibration from the Calibration Menu, I do get a smooth and solid square. Could it be that the first layer in the Benchy model is a "set of individual lines"?

Yes, I have gone through the article you mention. I already checked that the X and Y pulleys are properly positioned in the steppers axles and both allen screws are tightened. Maybe it is the belt tension, from the pictures could you tell if the belts are loose or tight? That would be a big help.

No mods yet.

Thanks!

Aaron

Posted : 12/08/2019 4:18 pm
--
 --
(@)
Illustrious Member
RE: New Member, new to 3D printing, first Benchy

First layer is high for sure; try printing a larger patch so you have time to adjust on the fly:

You have a loose drive pulley causing the non-circular circles.  And a loose drive can cause many of the artifacts you are seeing.

Here's an example of a loose drive gear:

This post was modified 2 years ago by --
Posted : 12/08/2019 5:23 pm
adiamant
(@adiamant)
Active Member
Topic starter answered:
RE: New Member, new to 3D printing, first Benchy

Thanks a lot for your replies!

Drive pulleys were not loose. I tightened X and Y belts and results were a lot better, although I think I am not there yet.

The trial and error approach with the Benchy takes a lot of time. Can anybody point me to, or even better, provide me a faster to print gcode file for  MK3S calibration purposes?

Many thanks!

Posted : 12/08/2019 11:11 pm
JoanTabb
(@joantabb)
Moderator
RE: New Member, new to 3D printing, first Benchy

if you see a problem in the lower part of the benchy, you don't have to wait for it to complete, you can stop the print and resolve that part of the problem... 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 12/08/2019 11:18 pm
adiamant
(@adiamant)
Active Member
Topic starter answered:
RE: New Member, new to 3D printing, first Benchy

Unfortunately the problems show after an hour, and more so in the last few minutes. I get a bit of ghosting around the bow holes, ghosting in the cabin walls and the smokestack is not completely round.

Posted : 12/08/2019 11:29 pm
JoanTabb
(@joantabb)
Moderator
RE: New Member, new to 3D printing, first Benchy

Ok,

How about re slicing the model so that most of the hull doesn't print?

I gave this a 5mm brim to ensure that the parts stuck to the build plate

Regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 13/08/2019 12:30 am
adiamant
(@adiamant)
Active Member
Topic starter answered:
RE: New Member, new to 3D printing, first Benchy

Thanks a lot!

I’ll give it a go.

Cheers

Posted : 13/08/2019 1:34 am
--
 --
(@)
Illustrious Member
RE: New Member, new to 3D printing, first Benchy

Here's a simple test part: 25mm cube, square corners with 0.2mm radius, 0.45 mm walls.

25mmCube

Test Cube gcode

This post was modified 2 years ago 2 times by --
Posted : 13/08/2019 7:06 am
adiamant
(@adiamant)
Active Member
Topic starter answered:
RE: New Member, new to 3D printing, first Benchy

Thank you very much Tim.

Being a newbie it helps a lot having the gcode. At this time I don´t feel like adding more variables doing the slicing myself.

Cheers!

Posted : 13/08/2019 1:56 pm
--
 --
(@)
Illustrious Member
RE: New Member, new to 3D printing, first Benchy
Posted by: adiamant

Thank you very much Tim.

Being a newbie it helps a lot having the gcode. At this time I don´t feel like adding more variables doing the slicing myself.

Cheers!

Slicing is when the hobby gets fun.  Don't be afraid of it.  Start with using the defaults, they work quite well.   Using other people's gcode is generally safe, but some of us use different startup methods, and may cause you some stress and tension when you see the printer do things you don't expect.  I do some preheating, and wait for the printer to stabilize - and you may find the delay unacceptable.  I remade the gcode with the stock MK3 startup and dropped it into this zip ... just in case.

25mmCube

Posted : 13/08/2019 2:25 pm
adiamant
(@adiamant)
Active Member
Topic starter answered:
RE: New Member, new to 3D printing, first Benchy

Thanks a lot!

Posted : 13/08/2019 11:37 pm
Share: