What is this bump when printing circular shapes ?
Hi
First post here, and I'm new to 3d printing. I couln't find an aswer to my issue but I suppose it has happened to other people (actually I lack the 3d printing specific words to do a proper research...)
Every time I print circular shapes, at the end/start of every perimeter I get a little too much extrusion and the result is this bumpy line that you can see in this picture.
So far I've only ever used PLA and PETG, with 0.4 and 0.6 nozzles, and it happens every time. I have no idea what is the cause, if it is a common issue, or if it can be fixed in the slicing process or the printer itself...
Thanks for any advice
RE: What is this bump when printing circular shapes ?
It's the seam, the position where the printer moves up to the next layer.
The slicer usually hides it in a corner or along the edge of a protrusion but a smooth cylinder leaves no hiding place.
You can try different seam settings at: Print Setings > Layers and perimeters > Advanced - you need to have Advanced or Expert set.
Cheerio,
RE: What is this bump when printing circular shapes ?
Oh thanks, now that I know what it's called I can look that up properly.
As I'm trying to make circular sliding mechanisms, apparently there will always be some kind of seam that needs to be sanded somehow... good to know, although I will try to find settings that produce a thinner seam.
I suppose that a finer nozzle would make for a thinner seam, I will first try that and see how it goes.
RE: What is this bump when printing circular shapes ?
I feel like since they went to the new Arachne perimeter generation the seams look worse. if you're in expert mode you can also try legacy seam generation. I've been meaning to try it myself, in particular for tpu. but you can try random seam placement so you don't get a line all the way up your model.
RE: What is this bump when printing circular shapes ?
As I'm trying to make circular sliding mechanisms, apparently there will always be some kind of seam that needs to be sanded somehow... good to know, although I will try to find settings that produce a thinner seam.
you could also try adding a bit more tolerance to your part.
prusa slicer even hase "xy size compensation" (Print settings - Advanced - Slicing (you need to be in "expert mode"))