Problems with print layer highlight(shist) compared to print piece
Good morning, my name is Valli Silvio.
I am writing to you in relation to a couple of printing problems I have been experiencing with the prusa XL multi-tool on a piece I printed the other day.Attached I have included sample photos.The printing problems I encountered are.
1) In the photo "Complete set" you can see the shift indicated by the blue arrows; this shift occurred in both sides of the print and in the same direction(shift inward) as if the columns before the shift had boarded inward and when the printer came to create the joint layer between the two columns it extruded in an unaligned position and thus created the effect.In the photo "Top Column Shift" you can see the shift created on the top side of the column more closely.I don't think it was a problem of loss of position of the print nozzle since the shift on both sides of the column occurred inward ; otherwise on one column I would have experienced a shift of the print inward and on the other a shift of the print outward
2) The second macro problem I encountered is the construction of the base hexagons as you can see from the photo "base hexagon".The hexagons in the photo "printing plane" are the first ones that built since they are just above the printing plane.In these hexagons I found different shifts on different levels.The curious thing is that the print shifted, creating those ugly lines in evidence every time you went from printing a layer at a 45° angle to the print plane to a plane parallel to the print plane as you can see from the photo "Shift associated with the plane".
Technical printing details
Printer: prusa XL multi-tool
Print piece size: 285(X) x 250(Y) x 180(Z)
Printing layer height: 0.25mm
Infill: 15%
Supports: Organics
Printing time: 26/27 hours
I am going to assume you are printing PETG based on the temperatures.
It looks as if you have some warping. Did (some of) the corners lift off the build sheet? This would be enough to cause most of your problems.
If so, scrupulus cleaning of the print sheet and adding a brim might be enough.
I would use cubic fill at a low percentage to help with stability and you will probably find that snug supports work better than organic in this case.
You could also try adding 5° - 10° to the bed temperature. Make sure you are not printing in a draft and that the air temperature does not drop overnight if your room heating shuts off.
Cheerio,
RE: Problems with print layer highlight(shist) compared to print piece
What Diem said. I second the suggestion of adding a brim. Your base in contact with the bed is rather slimm and your object is big and tall. Also, maybe a more regular tight fit support could yield better results. While it needs more material, it keeps the whole print way stiffer during print, which can also help against warping.
Mk3s MMU2s, Voron 0.1, Voron 2.4
RE: Problems with print layer highlight(shist) compared to print piece
Good morning, everyone.Last week I tried to apply the changes that were recommended to me:
-Infill increase from 15% to 20% with change of infill pattern from "grid" to "cubic"
-Infill plate temperature increase by 5° from 85° to 90°.
-Addition of the Brim, width of 10mmBut the print result is as shown in the photo(black print color) and still has the defects found in the first post, i.e.: prominent lines on the face of the hexagon (green and yellow arrows) and distortions on the base of the hexagon(blue arrow).
Seeing no improvement I tried printing a single corner (single hexagon) thinking it was a problem with the geometry of the part but the print result was excellent.
So I first thought of printing a single side (attached photo, print color green) by also increasing the contact portion between the print piece and the printer bed. As you can see from the last photo, the distortion effect I was getting at the base of the corner remains but is significantly reduced. In addition, the print piece always has prominent lines on the face of the hexagon that strangely correspond to the planes of the piece.
The end result I would like to achieve is the complete absence of the highlighted lines and the absence of the distortion in the base of the hexagon(yellow arrow in the last photo), do you have any opinions on what else I could change?
Thanks in advance to everyone for cooperation and support.
distortions on the base of the hexagon(blue arrow).
You are pointing at a corner warping off the base; the warping is causing many of your issues and making others worse.
Probably the most important line in my first reply was:
scrupulus cleaning of the print sheet and adding a brim might be enough.
Get your build sheet absolutely clean, use dishwashing detergent (Dawn/Fairy) and plenty of HOT water, dry with a fresh paper towel and handle by the edges only.
Set up a brim in: Print Settings > Skirt and brim
And there are signs that your filament is damp. Dry it before printing, look up threads here about drying.
Cheerio,
RE: Problems with print layer highlight(shist) compared to print piece
The end result I would like to achieve is the complete absence of the highlighted lines and the absence of the distortion in the base
Good luck with that. I think it will be a while before the firmware catches up to the hardware. In the meantime, we're going to see ghosting, layer shifting and all sorts of nasty artifacts.
A couple of things I did to improve the quality that actually had an effect:
1. Level your machine. Put a level across the top of the XY beam and level the printer to that feature.
2. Check your belt tension. Prusa has an excellent belt tension tool that is web based. Adjust your tension to be optimum in your shop conditions.
You're not going to get even close to perfect prints from the XL. I get better ones from my MK3S+ than ever came out of my XL. I hope they work that out eventually as I would like to see useful parts from the XL one day.