Vicky@Raise3D wrote:1. ideaMaker currently doesn't support selecting the center of the printing area as (0,0), except round build plate. We have received similar request before, it has been added into developing list.
great, that's what I wanted, to submit a feature request but if it already exists...
Vicky@Raise3D wrote:Normally the hollows are caused by retraction and coasting wipe. If you haven't enabled either one, then it should be related to the too thin extrusion lines due to the narrow gap in middle. Try scale the model up to make the extrusion lines in middle to match with the extrusion width you set and see whether the result is better or not. If it can fix the issue, then it means the current size nozzle can't print such thin extrusion lines with no issue.
Yes, I know, normally... but as I have seen this is not a normal situation, and it is not IM related (I get identical issue with S3D only with different width of the wall, probbly 'cause IM vs S3D calculate extrusion width differently, or I just have different configs, irrelevant for this discussion). I was trying to figure out what empties the nozzle that much. My guess, after hours of looking it print and changing different stuff, is that when I'm ordering it to under extrude through the 0.6mm nozzle and "stretch" the filament the PETG pulls on the filament trough the nozzle from the melt chamber emptying it. I noticed for example if I do a little bit of extrusion and wipe the head using silicone blade the extrusion starts immediately next it is ordered, on the other hand, if I extrude a bit and get the filament from nozzle with tweezers I can pull, and pull, and pull for a while stretching the string from the nozzle, and when I then order extrusion it takes a while before the filament start exiting nozzle.
I found two "solutions" here, one is to turn the gap-fill off, that works for these cylinders but is not a very good solution for general parts, or to increase prime value, again, works great for this cylinder (not as good as turning off gap fill) but again terrible for normal parts