Print Abnormality in Fusion Designed Part
After completing a few chapters in the Prusa Academy Fusion course, (awesome course BTW) I started creating my first "real" mechanical design. I'm making my wife a little shelf that will eventually run across the top of the headboard of our bed.
After creating the basic shape, I made a small test print to confirm the dimensions would work. Good news, they were perfect. Bad news, there appears to be some kind of print abnormality/indentation where some of the walls are. This is most apparent on the back plane, but they also show up in other parts of the print. I don't see any design issues in my model file, so I don't think it is a Fusion issue. I'm assuming its something in the slice, however I don't anything like it there either. This was printed on my Mini+ using Prusament PETG. (I used my XL for some photos.)
Does anyone know what this is, and what I can do to fix it? Thanks!
Mini+MK3S+XL 5 Tool
RE: Print Abnormality in Fusion Designed Part
what you see can have multiple reasons:
- the shrinkage due to the change between the bottom large area and the pass to the thinner wall
- underextrusion due the way how prusa mini bowden moves
Try to print it so that the most exposed flat wall is parallel to Y axis.
Also try other color 🙂 , red/orange is awful in looking at due to the image compression.
See my GitHub and printables.com for some 3d stuff that you may like.
RE: Print Abnormality in Fusion Designed Part
So I've gone and tried printing on my XL, this time in PLA, unfortunately in red @_kaszpir_. I did this before you posted. 😄 The results were identical. And to @joel742bushong, the PETG was coming out of my PrintDry which was running ~ 3 hours before I started the print, and continued to run while the print was going. The XL does have socks. Thank you for the suggestions though.
As @_kaszpir_ mentioned, I believe there is a design issue with the shrinkage due to the change between the bottom large area and the pass to the thinner wall. To the design experts out there, is there a way to address this in the design, or print settings, such as changing up the number of perimeters, infill, etc.? Just tossing some ideas out there. I really like the design that I have, but I'm not opposed to modifying it in some way if needed.
Mini+MK3S+XL 5 Tool
RE:
I had some ideas and did the following:
- Used the structural print profile. (Slower than the stock speed setting I previously used.)
- Changed infill to gyroid 15%.
- Rotated the part 90 degrees on the bed.
Same results. While it's not terrible, I expect a better looking part from such a simple design. For the most part the print looks beautiful outside of those few areas.
Two different printers, two different materials, I believe my issue is somewhere in the design and/or print profile. It's like some forces are interacting on others in the print. It's going to bug the heck out of me until I figure it out. 🙄
Mini+MK3S+XL 5 Tool
RE: Print Abnormality in Fusion Designed Part
If this line is level with the flat area as I suspect, then it is most likely a common issue called The Benchy Hull Line, read more here: https://help.prusa3d.com/article/the-benchy-hull-line_124745
RE: Print Abnormality in Fusion Designed Part
Thank you @3delight. I believe that is the issue and something I can look in to.
Mini+MK3S+XL 5 Tool