Timbergetter

Thanks again gr5. I can now see I have been asking for miracles with my selection of layer height, speed and temperature. I shall now go away and try again while taking account of your recommended throughput/temperature combinations. I used the Cura slice viewer for the first time and can now see the value in that. The outside shell is being laid down in an anti-clockwise progression. The under-extrusion is therefore happening at the start of a circuit, and this now makes sense to me.

How long before my post can appear on the public forum? I am still keen to see if someone recognises the effects I am getting.

Sorry - I did intend printing 0.4. Now that I measure the printed object I see it is actually printed at 0.2 mm layer height. (the maximum outside dia of object is 82 mm).

Many thanks gr5. I’ll try attaching photo again. I’m a bit new to this so I didn’t recognise that 13 mm^3/s was large. If the photo worked this time you will see that the first 80% of each layer is fine but then tails off to under-extrusion (if that’s what I’m seeing) in the last 20%. I suppose the travel time between layers might allow a bit of catch-up time to replenish the filament feed/pressure. Is that a possibility? My printer is the Cocoon Create

I am hoping that someone will recognise what might be causing the defects in the print shown. I am doing a draft print so the speed is 80 mm/s and the layer height is 0.4 mm. (actually 0.2 mm as found later). If the defects were more random I would think that slowing things down might help. However most of the print is acceptable to me and it is only towards the end of each layer that the feed seems to starve for filament. On the outside surface the layer change occurs at about the 5 o’clock position. Everything is good from 5 o’clock all the way around to about 4 o’clock where the problem begins. On the inside surfaces a similar but worse result occurs and is about 180 degrees rotated compared to the outside surface. Even the 45 degree overhang half way up the outside surface is good except in the 4 to 5 o’clock postion. Cura 3.2.1 in use.

I am trying to follow the Extruding a Polygon example in the OpenSCAD User Manual. I am getting a Preview result as shown in the attached photo. The Preview seems to have inherited the nominal 1 unit thickness of the polygon shape. When I progress to the Render function I get the following warnings: Rendering Polygon Mesh using CGAL... WARNING: Mixing 2D and 3D objects is not supported. WARNING: Ignoring 3D child object for 2D operation At the conclusion of the Render process the graphic displays just a 1 Dimensional red line on the x-axis. Any idea what I am doing wrong here?