bergie5737

Hi Icherry Thanks so much for all the hard works and effort you've put into this problem. I was hunting around how to speed up a print for a basically square "ammo style" box when I looked at Cura's rendering of the print. (My old laptop were unable to do it...) I was fascinated to see how many useless travel moves happen. After a lot pfaffing, I got a 23hr print down to 16hrs (layer height was the biggest factor of course) Then as I analysed, I tried various setting to get the printer to move less. The walls is just walls, so it should print around and around, one wall at a time, but in stead, it start at the front, work about 3/4 along one edge, then the print head jumps to the opposite side, does some printing, goes back to the previous position and in general does illogical things. In the end, I managed to get the print done in 11hrs, by turning things on and off. (Man, did I have cobwebs inside that box due to no retraction... retraction added 1hr+ to the print time, light sanding took 1 minute to kill the cobwebs. My daughter had fun pushing her hand into the cobweb box - so double bonus there!) Today I am printing and STL from Thingiverse, thus had not control over wall thickness etc. (I normally design walls to be exact multiples of the nozzle width, in the box case 1.2mm) The print is basically three circles in a triangular pattern. With my speedy settings as above, I noticed odd behaviour in the simulator. As your excellent post has shown, Cura will start with the inner wall, go about 1/4 around the circle, and then backtrack on exactly the same line, stop, go over the line once again, and when it reached the end, a travel move takes the printer to a new section of the print. This was still ok, but for only one circle, the simulation show that the print head prints "a dashed" line although it redoes the whole section, as above, then after it has done another part of the print, I comes back and fill in the gaps in the dashes, three times.... No matter the line width, it is the same result. One of the three circle sections have thousand of little holes ( the one printed with dashes) the others looks ok thanks to the "ironing" of every layer! Oh, and my printer skips when it is printing over the same line, even with "flow compensation where a wall exist" turned on. I am going to try Slic3r again, and if it goes faster and cleaner, I'm in. I have noticed this odd "holy" behaviour since about a year ago and thought my filament is to blame - I live in the tropics now, so humidity is super high. I simply thought that it only happens when "bending" the line as straight lines always and still looks great! New laptop, (and your post) has shown me why I can print a straight line at 65mm/s with no skips, but a small curve at 35mm/s skip steps on the inner wall - it reprints the inner wall 3 times.