oneearthtech

Hi Dustin, OK no problem, I have added this: https://github.com/Ultimaker/Cura/issues/16336

Hi Team, I have a feature request/bug fix relating to the way Cura handles the first layer. Feature Names "Initial Layer Polygon Smoothing" Goals: - Create as simple and smooth initially first layer with as little travels as possible - Gradually Smooth the outer wall Geometry into a circle. - Remove horizontal gaps between layers where Geometry is to "Sharp" Geometry Type Works best with geometry like circles, stars, ovals, squares without any holes. Problem: When using Concentric on the first layer, and having Connect Top and Bottom Polygons selected Cura produces a "Non Stop Tool Path" which spiralizes from the inside out leaving a single layer line between each loop. Cura then "Closes" the loop and fills in this gap on the inward pass. This works very well in most cases, however some more complex geometries tend to have issues. The current work around is to adjust the initial layer with % until a suitable tool path geometry is created. This takes alot of trial an error. We have already made a custom change to the version we are using so that Cura spiralis from the outside in, then out again. This saves a travel move from the outer wall to the center. Here is the change we reverted: https://github.com/Ultimaker/Cura/issues/5033 The main issue now is when Non Standard Geometry is used. As shown below. Here is a close up that shows sections where a "Sharpe angle" is created which inevitably leaves small gaps in the first layer. Ideally cura would "smooth" the outer geometry gradually to eventually become a rounded edge square, rectangle, or ideally a circle in the center. Allowing the initial layer to overlap horizontally slightly by roughly 5-20% may help to provide a smoother tool path and may help to close up the gaps. The space between the layers as it spiralizes back out would need to be no larger than 80% of the layer width. For example. If the layer width is 2.5mm than the space left between the lines would be 2mm It wont work perfectly for every geometry, but for most it might. Below are two geometry types sketches that might help to explain what I'm trying to achieve. The star seems to be the worst and might not actually need this setting but with the correct amount of smoothing it might help.

Hi Cura People. I use Sprialize Outer Contour Mode alot to print large objects using PETg. Heres some more info: Build Volume = Delta 600 x 350D Print Speed = 8mm/s Line width = 2.5mm Layer Height = 0.7 This thread falls into Feature Requests but let me know if there are ways to mitigate the following issues in the current version. Not Truely Sprialized This issue relates to the bottom layers. Cura starts by printing the outside wall then proceeds to Sprialize from the inside out requiring the need for travel and/or retraction. If multiple bottom layers are set, this happens on every bottom layer leaving a Z Seam (Sprialize Mode + Wide layers are being used to avoid a Z Seam while maintaining wall strength) Issue 1: Bottom Layers are not Sprialised Ideally the bottom layers would Sprialise in one continuous motion as to not form a Z seam. This would mean starting at the centre and working outward or vic-versa without travel or retraction. . However, using the current version Cura first prints the "outerwall" as shown in red below before moving inward to start Sprialising the bottom layers (yellow) outward. Potential Fix : There are two cases to consider: Odd and Even bottom layer counts. Case One: Even Bottom Layer Count When setting Even numbers for the bottom layers the print could start with the outer line first then work its way to the inner most point then raise up and sprialise back outward before continuing in a smooth motion to build up the walls above the bottom layers. This may leave a small artifact on the first loop when the print head moves inward but this could be avoided if Bottom layers were limited to odd numbers. Case Two: Odd Bottom Layer Count When setting Odd numbers the print head could start in the centre of the model, work outward to the outer wall - z lift - then back in to centre - z lift again- before proceeding outward before building up the outer wall once the bottom layers are finished. This could lead to a truely continuous print. This would help to limit retraction/travel and a much smoother "Vase Mode" type print. Issue Two: Inner Walls Generated in Bottom Layers Sometimes the bottom layers will print with an Inner Wall (shown in green), leading to retraction and not a "True Sprialised Mode". I look forward to hearing from you. Talk soon Matt