Gear like pattern on some round shapes
I have a strange phenomenon with my prints: Printing at about 120mm/s there are gear shaped patterns on some round shapes. So far ONLY in more complex models.
They appear on:
Holes, cylinders (outside), rounded edges all in X Y, all around
They do never appear on simple objects or in streight walls
In an example print I put 3 objects on a plate: two cylinders and a complex object with a hole.
The cylinders print perfectly round and the hole is gear shaped.
Also listening to the print there is a significantly different sound with the good and the bad shapes. I'll try to video it.
I use the orca slicer 1.7 and I am not sure if the slicer is to blame. It is the first slicer I use for higher flow rates. Can it be that the ratrig's RPi4 or the Octopus board bottom out processing the complex object?
How would you proceed from here?
6 Replies
Okay - the audio is probably not helping too much. But trust me. The inner diameter print sound like there is a lot of deceleration / acceleration going on.
After some research I upgraded to a RPi4 4GB and from a v10 to a v30 sd - but the geared structure remains
I assume the model as well is like that
Can you share the cad or a preview in the slicer prior to slicing from the to0
Top
All three STLs should not have structured diameters.
I attached the three stl files and the resulting gcode file
- I designed the three files in Fusion 360 with the same export parameters (medium resolution)
- funny thing is that both cylinders print perfectly round and the Proxxon adapter does not.
All the other parts that are more complex than just a cylinder or so will show those gear structures on inside and outside diameters / roundings.
The problem remains. you can literally see the print head slowing down from 112mm/s and there is a sound like an anti-lock brake (it intends to slow down fast and then speeds up again in fast sequence) during the whole curve. I am sure this "start-stop" motion causes the ripples but I am out of ideas what can cause this and how to test further.
exotic-emerald•12mo ago
Can you see something funny in the sliced preview? If possible pls share the project file from your slicer (.3mf)
Ha!! Found it! I checked my slicer settings against the current standard for the ratrig and found (among other small tweaks) that my jerk settings were off. (x and y 1!!) no idea how I ended up with those but setting them to 9 took care of the grear structure. Still don't know why it only showed with complex objects (that's why I did not check the slicer earlier) - but solved is solved!!