Guys what do you make of those corners? What would need to be adjusted to get rid of those?
It looks like the jerk values are too low so it “stays” over the corner for too long, leading to excess material being deposited.
As I see it’s every 4th layer, but the are alternative. So, one for each corner, then repeat, in a spiral.
Doesn’t look like z banding so I would agree that it’s probably your jerk values. There are multiple tests on thingiverse for tuning it.
When printing does your job start each layer in the same corner or switch between corners on each layer?
If it is starting each layer in a different corner, then what I see might be over priming.
That looks like Z wobble to me. Assuming a ~0.25 layer height, there’s almost always 4 layers between each wobble, which would match a 1mm thread pitch perfectly.
I suppose increasing the jerk speed should solve this at least that what’s it says in repetier firmware. Jerk is at 30mm/s and still look the same. The print start at different points. What is over priming? Is that over extruding?
Jerk: I assumed this meant acceleration - I would expect a number like 1000mm/S^2.
Priming: When the head stops printing a line and moves to another location, often the gcode will pull back/suck a few mm of filament to prevent material from oozing/dripping/stringing out while it is repositioning for the next line. Then once in place, before it can actually start printing it needs to push that filament back into the hot end - this is called Priming. And too much priming can look like over extruding at the start of a line. Also, priming/sucking too much/too slowly can leave the hot end parked on the previous layer causing it to remelt and swell. Another potential cause of puffy corners.
If the bumps are every four layers, the problem is excess material deposition OR insufficient cooling at layer changes.
There’s definitely Z axis wobble evident in that part. There is also some minor overextrusion at the corners. So, one tuning problem, one hardware problem.
It could also be that you layer height is not an exact match for your z motor step intervals… Thus making every nth layer deposit too much plastic?
@Jan_de_Jager interesting never heard of that. Is there a way to calculate that? My Z axis foes wobble a lot so I’m in the middle of finding a solution for that
On closer inspection of the picture I dont think that is the problem though.
@Ashley_Webster I did run retraction up to 1mm with no effect. I had better result with 10c increase in temp and just minor details on some of the edges. There is still some but very little. I think with some better cooling I will get better results.