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Posted
· Unique Slicing Needs, Looking for Guidance
Some ideas as they came to me, so no particular order:
There's a fifth option, just write gcode from scratch, you'd just need to figure out the correct extrusion rates. The maths are probably somewhere online.
Instead of relying on making infill I would create a model of exactly what you want (piss easy in OpenSCAD, easy in FreeCAD, probably easy in several other programs), that way you can set the line width, spacing and alignment exactly as you want them, including thinning near the end.
If you're having problems with extrusion being absolute, M83 turns on relative extrusion while you're still in absolute positioning mode (and the M83 lasts until either a G90 or G91 is used) but you'd need use a post for Cura to convert the absolute extrusion values to relative, (but that wouldn't be hard).
It sounds like you have overhang at the ends of the lines for these to fit together? You'd need to use a dual extruder printer with a soluble material to print supports between each layer.
9 hours ago, GravyBagel said:
Need to clean up the edges so I have clean edges without post processing. Some methods:
Driving backward after reaching the end
Z retraction during movement backward
Z hopping
Filament retraction
Slight travel offset from end of line to account for diameter of filament blob
Combination of some or all of the above
That'll just lead to a thicker (width or height, depending on which way the filament goes) end because even with a retraction you'll still ooze a little bit.
Z retraction? Z goes up or down. Filament retracts.
Usually paired with a retraction, but still doesn't instantly get rid of all the filament at the end of the nozzle, plus you don't really need to Z hop to just to move over to the next line.
Still going to leave a blob on the end of the nozzle which has to go somewhere.
A blob isn't going to be that predictable. If I was doing something like that, I'd do a wicked fast travel move while retracting and hope the blob ends up somewhere that isn't the model.
For thinning down all the edges, making your model instead of just making infill is exactly what you need to do, that way you have control of how thin it gets, where it starts thinning, etc., rather than adjust the filament extrusion and hope it makes the wall thinner instead of shorter or something.
How dense infill are we talking, anyway? If it's not 100%, bridging at a scale that small should be possible, but it depends on filament, and density, and other stuff. Possibly including wind direction, even if you're inside. Basically bridging isn't 100% guaranteed but as I said, at that scale it should be alright.
9 hours ago, GravyBagel said:
DIY slicer for specific use (Python + Shapely)
Plugin for Cura
Write post processor
Another more precise slicer with these options?
Really depends on how good you are at Python, but if anyone could just DIY a slicer they need existing ones wouldn't be so popular
Plugins are a major hassle, unless you're @ahoeben. Sounds like what you'd want could be done in posts, anyway.
If you're going to go that route, definitely split it up into multiple posts, one for each thing you want to do. Will make your life so much easier because Cura's post-processing script debugging is... somewhat lacking.
I know bringing up this name around here is heresy, but I think Prusa Slicer does give you a little more control, but probably nothing has everything you want. But if I was well educated on other slicers, I probably wouldn't spend so much time lurking the Cura forum.
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Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more.
S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
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Some ideas as they came to me, so no particular order:
Usually paired with a retraction, but still doesn't instantly get rid of all the filament at the end of the nozzle, plus you don't really need to Z hop to just to move over to the next line.
Still going to leave a blob on the end of the nozzle which has to go somewhere.
A blob isn't going to be that predictable. If I was doing something like that, I'd do a wicked fast travel move while retracting and hope the blob ends up somewhere that isn't the model.
For thinning down all the edges, making your model instead of just making infill is exactly what you need to do, that way you have control of how thin it gets, where it starts thinning, etc., rather than adjust the filament extrusion and hope it makes the wall thinner instead of shorter or something.
How dense infill are we talking, anyway? If it's not 100%, bridging at a scale that small should be possible, but it depends on filament, and density, and other stuff. Possibly including wind direction, even if you're inside. Basically bridging isn't 100% guaranteed but as I said, at that scale it should be alright.
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