No, it was removed so I can make measurements. As suspected, the problem with the print head knocking into the object/supports is some function of differential cooling effects on larger prints (those straying outside of the 150x150mm inner zone) where the parts cooling fan is less effective. Working on a fix.
Edit: for now, the workaround is to listen for the faint rasp of the nozzle coming in contact with some portion of the print, and turning down the printer speed via fine control to where the problem goes away. Not a good solution since it slows the printer way below its normal speeds for small objects in the middle of that 150x150mm green zone. Guessing the proper setup for running it fast for large prints is to improve the partfans configuration.
Here is the part I designed to help with the differential cooling effect of the OEM large noisy parts fan mounted to the X crossbar. The vanes had to be nudged around a little to make the airflow spread in roughly a 180-degree pattern. Definitely not a pretty design, but it helps.
Thank you again for your original post … the process of trying to print 4-up hearts print is what led me to learn a whole lot about differential cooling effects.
I looked at how some of the faster printers tend to deal with this same issue, and the answer would appear to be that they have some pretty good parts cooling capacity mounted right on the print head. So now I am looking into designing a print head bracket that can hold a pair of 5015 fans. The SV07+ is quite a fast printer, and it would be a shame to have to limit the speed of it just because of parts cooling issues.
In the meantime, for wide-area prints or prints with lots of tall sections, you will want to listen for the faint knocking/rapping that indicates contact between the print head and some taller layers that haven’t cooled properly yet … go into fine controls and crank down the speed by multiples of 10%, then listen to repeated layers to see if the noise disappears or reduces. These problems did not reveal themselves during the time when I stuck to making small prints in the center of the bed.
with regards to placement of the copies for printing, wouldn’t it make more sense to have the sharp ends of the hearts all pointing to the centre of the print bed, thus keeping them (mostly) within your 150mm zone?
The layout of the hearts was how Orca auto-arranged them. And ideally the printer should be able to print most any STL file you throw at it, right? (at least that is how I am trying to make the printer work) To that end I’ve been working with a dual-5015 parts cooler and changing the cooling profiles (by material) to optimize results.
this is awesome!! I can’t wait to print this !!