I use Cura, so some Prusaslicer terms are confusing to me.
Particularly the infill pattern.
In Cura, the default pattern is “lines”, which does a lattice with alternate layers having the lines in one direction and the next rotated by 90. There is also “grid” which has the full grid on each layer, and my usually preferred “cubic” which is a full lattice skewed so similar strength in all 3 axes.
In “line” and with 0.3" layer (0.4 nozzle), 70% puts the infill lines at a 0.6 mm spacing! This is crazy dense ( < 0.2mm gaps. Might a well just go 100% solid!)
All the 3D printing “experts” seem to agree that for more strength you want more perimeters/walls/shells rather than more infill, and that seems to agree with my (limited) experience.
So, what is “rectilinear” infill, and what does it look like at 30% and 70% ? If it is anything like what Cura produces, then that is where the print time is going.
I’m guessing for my .4 nozzle and Cura, I should be looking at 4 perimeters and 25% infill, either cubic or gyroid (gyroid was tested on someones site as the strongest per gram of material, but it is all curves, so huge gcode and slow to print) .
Info, comments and advice please! I don’t want a slow heavy block of near solid PLA, but I don’t want to crush my core the first time I tighten a bolt.
Well… The scuttlebutt is that yes, perimeters is important, so 4 is a good number. But 25% infill is too little for the core. I believe the going recommendation is actually 70/30/70, where you use bounding shapes to set the infill densities higher at the ends of the core where there are more attachments being made (and you really need the strength), and less infill in the center, where there’s less going on. I don’t recall the exact measurements. But even gyroid won’t cut it at 25%.
On a side note, gyroid is slower than lines/rectinilear, but faster than honeycomb, or triangles, or anything that makes a lot of abrupt angles. At least, if your firmware handles acceleration properly. You can accelerate through curves a lot faster than through an abrupt angle.
Thanks. But 70% gyroid in Cura still has a line spacing of < 0.6mm. Seems crazy dense. Even 30% is only 1.33mm spacing.
Is this a Cura vs Prusa interpretation of infill % thing, or is “rectilinear” somehow special?
It is what Ryan specified in the specs for the part. I’m not a designer just saying it works message Ryan with concerns he has the definitive answers be he has posted as what is needed and works