Vertical Ridge on Petg  

RE: Vertical Ridge on Petg

@zoltan

The latest version.....4.3.1, there hasn't been any updates since February. Yes can share stl but out ATM, but will see now if can download from my NAS drive. Ok, got it

RE: Vertical Ridge on Petg

@zoltan

Tried to upload the stl but the file was blocked and message said file not allowed, so I guess you can only upload image files. But here is a Dropbox link to download it. https://www.dropbox.com/s/rcyrpv0640rv3f8/junction%20box%20top%20mod.stl?dl=0

RE: Vertical Ridge on Petg

@rick-7

You often have to zip uploaded files.  I am not sure about STL files.

RE: Vertical Ridge on Petg

I believe any attachments must be zipped, not only to "make safe" executables and the like but also to compress files and combine multiple files into a single attachment. It's slightly annoying, but very common with forum software. You can drag & drop images into the edit area, or upload multiple images at once with the Add Media button above the edit area.

RE: Vertical Ridge on Petg

@bobstro

Oh that's interesting. I wondered if there was way to upload more than one image. Regards the seam gap problem with the min: Some people are suggesting that adjusting linear advance (K Factor), may help to reduce the gap length. Prusa of course have an advanced calibration method to do this on their knowledge base, but only provide test gcode for the Mk3.

However a guy on this forum has modified the gcode file to suit a mini, which I'm going to try out tomorrow for Petg. It will be interesting to see how accurate the preset K Factor setting number is for Petg, considering that all different filaments require a slightly different setting.

RE: Vertical Ridge on Petg

Posted by: @rick-7

[...] Some people are suggesting that adjusting linear advance (K Factor), may help to reduce the gap length. Prusa of course have an advanced calibration method to do this on their knowledge base, but only provide test gcode for the Mk3.

I just put up a notes page on calibrating Linear Advance including a test print and sample gcode. The range is set for values for the Mk3 but the gcode is easy to adjust. I can easily crank out a test print variant if someone will let me know what range would be appropriate for a Mini.

RE: Vertical Ridge on Petg

Posted by: @rick-7

@zoltan

Tried to upload the stl but the file was blocked and message said file not allowed, so I guess you can only upload image files. But here is a Dropbox link to download it. https://www.dropbox.com/s/rcyrpv0640rv3f8/junction%20box%20top%20mod.stl?dl=0

Succesfully downloaded. Tomorrow I will try to print it out and will come back with info.

RE: Vertical Ridge on Petg

@bobstro

This guy has already converted the Linear Advance test gcode to suit a mini, but I haven't run it yet.

https://www.prusaprinters.org/prints/53359-prusa-mini-linear-advance

RE: Vertical Ridge on Petg

Posted by: @rick-7

[...] This guy has already converted the Linear Advance test gcode to suit a mini, but I haven't run it yet.

Ah, thanks. Look like 0-1 is a good range to test. I'll generate a test tower with a suitable range. Thanks.

RE: Vertical Ridge on Petg

Hi @rick-7

recentyl printing your .stl  model, but with my filament profile Prusament PETG and 0,2mm layer height. 

Would be probably best you ZIP and attach your .3mf file with your own settings to check.  

When the print will be ready I will atatch the photo.

RE: Vertical Ridge on Petg

@zoltan

That could be complicated sending my 3mf file because I have about 6 of them with different settings to get rid of that ridge, including custom gcode inserts to change extrusion at the transition point. The truth is that it shouldn't be necessary to get a good print from the mini or a Mk3 by using complicated slicing. I would be interested to see how your print turns out with standard slicer settings. Let me know how your print turns out....thanks

RE: Vertical Ridge on Petg

@rick-7

see please below the printed box. 

the ridge is not there, the seams are visible on the rounded corners.

Sometimes the "print outer perimeters first"setting could help.

So I do not suspect any FW issue. I was printing with 4.3.2 RC1 which is already issued on github ( https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v4.3.2-RC1 )

RE: Vertical Ridge on Petg

Even I do not have a filament "spacing" between layers, with sharp corners I think seams would also disappear.

Standard Prusament PETG profile )orange Prisament PETg used) , 0,2 mm layer height. With 0,15 mm I suppose it would be more smooth.

Do you have any other filament PLA .... to slice it and print it out to eliminate printer issue?

RE: Vertical Ridge on Petg

With PrusaSlicer 2.3.1 you can draws your own seam path.

RE: Vertical Ridge on Petg

@zoltan

So this was 0.2 layer height printed on the mini, with prusament Petg on quality settings?

I don't know why that firmware upgrade is not showing on Prusas firmware upgrade page. Is that a beta version?

I can still see the ridge but it's very slight. Assuming all the above is confirmed, what would you attribute my ridge issue to.

I've just done the Linear Advance test(see image) and looking at that test, clearly the preset K value of 0.2 is no where near right for my Petg. I haven't studied it yet to clearly identify the best setting as they are so close at the higher values.

RE: Vertical Ridge on Petg

@zoltan

Yeah I know!, But it doesn't get rid of the holes I am experiencing. Ide rather have bumps or blobs, because at least you can sand those off!

RE: Vertical Ridge on Petg

I just had a look at that image I sent you and its probably too blurry for you to see the lines clearly. The best straight and parallel line extruded was 0.56 or 0.6. The other lines were irregular widths from start to finish. I will soon test a new K setting to see if I can close up those perimeter holes.

RE: Vertical Ridge on Petg

@zoltan

Can you explain why those seam artifacts are only at a few layers and not all the way up the corner?

I tried a K factor of 0.56 and it didnt seem to change or effect anything. The information I found about modifying linear advance said to change the value in the custom gcode script in the filament profile, which I did. I put the seam in the middle of the rear to see it more clearly.

That seam is with K0.56. Tho other 2 images are after I sanded it and polished with car polish. 

I had a look at that github firmware update, but might hold off on it since its only 9 days old and would rather wait and see if Prusa are going to approve it and put it on their firmware upgrade page. Also those bugs they fixed for Octoprint and USB issues dont concern me. It doesnt seem to have eliminated the holes in the seam that you still have. I print ABS all the time on a flashforge Guider IIs, slicing with Simplify and I never get those holes, so theres something wrong there. I usually get a very slight prominent line, which is easily sanded off. You cant sand off holes.

RE: Vertical Ridge on Petg

Do you mean mine or yours? Mine are due to the Random seam positioned along all corners. 😊 

RE: Vertical Ridge on Petg

@zoltan

Oh I see, all corners. That explains it.