I keep getting these layer shifts on my prints for any substantial print on the H2D. The offsets don’t effect the entire layer just a subsection. I’ve had this happen on PLA (black) and TPU (blue) [haven’t tried other materials yet].
It’s weird because the offset doesn’t impact the rest of the print. It’s very localized. My H2D is essentially brand new. I have recalibrated it as well and tried the right and left nozzles.
Any ideas on how to improve/mitigate this? The H2D wobbles soooo much. I have it on a dedicated desk that is sturdy with nothing else on it. The layer offsetting happens sometimes on my X1C’s but it’s rare where as I can almost guarantee it will happen on my H2D.
your layer separation corresponds to the seam placement. Each uneven line only happens with a new seam placement, with the previous seam blobs blocking the extrusion path.
I don’t know how to fix it with TPU, it’s very hard and complicated already for “harder” filaments. Would be quite a lot of filament tuning work to do to make TPU extrude as smooth as other stuff. Especially when you’re printing in 90A. But even Zellerfeld cannot make it perfect.
Understood. This happens on my PLA prints too (the image of all black lid is Creality pla). I use the default settings from the 3mf file I just linked.
It’s a bit hard to understand the issue from that image, isn’t that just a glue line…? I generally have very positive results from Hyper PLAs and I genuinely believe that they’re better quality controlled than bambus… with these filaments at least
Would be great if some more images can be posted and better quality!
That black line isn’t glue or anything else. That’s what it looked like after coming off the print bed. I printed the part on its side so that line/layer was not close to the bed.
I’m noticing a pattern that might just be coincidental for now but it seems that these shifts are happening at layers where the geometry changes. For example, in the all black bed frame lid, the shift seems to line up with the bottom of the “birthday” text - well for some of the letters. The print orientation was with “Birthday” upside down.
For the brown ams hexagon wall shelf 9000 the layer shift seems to occur around the apex of the fillet.
I wish I had more prints to share right now. My other big parts I’ve covered in suede and screwed into my bed frame.
Thank you, now I can clearly understand what’s the issue of the print. In fact it’s not random, this is happening because of the overhang area and bridging. And I’m sure the model would have such defects and artifacts on almost any FDM printer, without lots of slicer tweaking and using expensive fibre reinforced filaments.
The chance of it happening would increase with the part grows taller, and with more overhangs/bridging/separated parts connected later on.
For example, your beige/wood model, the kickstand part and the main body part are not firmly connected with eachother for a very long time and for a lot of layers. This means that any uneven shrinkage and warp (even very minor), can cause a very visible layer line. There’s not much we can do about it without introducing a lot of cost either timely or financially.
Then, for your black part, it’s even worse becasue it’s bridging (circular holes underneath), and it’s also trying to overcome the deformed layers underneath (because of the circular hole, the layers other than the top most layer are severly overhanging and can cause extrusion issues), and it’s also having the emboss text to fight with…
I’ll keep an eye out for that pattern. Thank you for the information.
I do feel like this effect is more pronounced on the H2D and I am surprised it only happens on a single or a small subset of the overhangs/bridging.
But it does make sense and the layer at which this occurs isn’t always the same. I’ve made 4 of those black lids and if I recall correctly the layer shift was at different heights each time.
yes, it’s accumulating the chance… and the higher/more overhang it has the higher the chance. The motion system is very accurate, but not so much with the molten plastics. All other walls are easy to print, but every time it goes through the challenging part it’s like gambling.
