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John
 John
(@john-8)
Eminent Member
cylinder offset

Hi, hoping for some advise. I'm printing simple cylinders and notice that at random heights

the printing shifts over by 1 or 2 mm for several layers, then goes back to normal. In a cylinder of 20 mm

it did this several times. Any idea how to correct this? Im using petg. thanks john

 

Posted : 04/12/2021 8:07 pm
JoanTabb
(@joantabb)
Moderator
RE: cylinder offset

Check that your motor pulley screws are set correctly, with one in the middle of the motor spindle flat, and both screws tight!

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 : 05/12/2021 12:39 am
John
 John
(@john-8)
Eminent Member
Topic starter answered:
RE: cylinder offset

Thanks, but as I bought it pre assembled, I'm not sure what you're referring to, though I did check the screws

and all seem tight. As I print a lot of hollow cylinders for astronomy adapters I'm trying to get smooth prints.

I notice there is a vertical seam on all these cylinders where the print starts and going upwards to the top of the print.

The prints are also not centered. I'm using fusion 360 and prusa slicer. Could this be the slicer?

Posted : 06/12/2021 12:24 am
Diem
 Diem
(@diem)
Famed Member

https://help.prusa3d.com/en/guide/2-y-axis-assembly_165795

Step 28

https://help.prusa3d.com/en/guide/3-x-axis-assembly_167854

Step 11

I'm trying to get smooth prints.

It's always best to regard FDM prints as blanks ready for finishing.

I notice there is a vertical seam

Print Settings > Layers and perimeters > Advanced > Seam position

The prints are also not centered.

PS may be picking up the origin from your design file, a centered design should be centred in PS.

Cheerio,

 

Posted : 06/12/2021 2:21 pm
John
 John
(@john-8)
Eminent Member
Topic starter answered:
RE: cylinder offset

Hmm, The design was centered in fusion and on PS the object is centered on the platter. To experiment ,I moved the design 

on fusion 25 mm x axis and sliced that,(which still looked centered on the platter) and it still prints 25mm off center ,where it was before the manipulation in fusion. Could off centering of the print cause the irratic printing(slight shifts in the cylinder in xy plane?). john

Posted : 06/12/2021 5:16 pm
sylviatrilling
(@sylviatrilling)
Honorable Member
RE: cylinder offset

I suggest that you contact customer service. Go to the e-shop and wait for the chat to appear in the lower right corner.

Mk3S+,SL1S

Posted : 06/12/2021 7:38 pm
Diem
 Diem
(@diem)
Famed Member

OK, perhaps your XYZ calibration is out; if you've printed nothing large recently it might have gone unnoticed.  Redo and try again.

Cheerio,

Posted : 06/12/2021 7:45 pm
RandyM9
(@randym9)
Estimable Member
RE: cylinder offset

 

Posted by: @john-8

The prints are also not centered. I'm using fusion 360 and prusa slicer. Could this be the slicer?

If you mean the print isn’t centered on the bed during printing and, on the off chance you haven’t already tried this, there’s a button in the interface menu in the top of the PrusaSlicer screen that centers your print on the bed when toggled.

Sorry if this is overstating the obvious. Everyone has a different level of experience. 

Thanks to @bobstro for his online notebook where I borrowed the image from. Please let me know if this was inappropriate on my part.

https://projects.ttlexceeded.com/3dprinting_techniques_adaptive_layer_heights.html

R-

Posted : 07/12/2021 5:37 am
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