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u/ListeningIntentlyNow

▲ 4 r/openscad

Creating Hollow/Shell of a curved objects

I have a solid object with unique curves that needs to be become hollow, with equal thickness walls throughout.

Think of it as taking a solid chocolate Bunny and making it the cheap hollow bunny.

I tried doing a difference of scaled object, but that just doesn't work for keeping uniform walls of curved surfaces.

I tried fiddling with minkowski but ended up with errors that are outside of my comprehension:

~~~

ERROR: Nef minkoswki operation failed: CGAL ERROR: assertion violation!

Expr: sf_old->mark()

~~~

Is there a simple waying of doing this on recent builds?

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u/ListeningIntentlyNow — 7 days ago
▲ 1 r/FixMyPrint

I am having surface quality inconsistencies with my ASA prints that I can't seem to calibrate out.

I have tried all sorts of flow ratio and dynamic flow calibration settings, which is what I thought would solve it. Flow ratio certainly can squish or separate the lines, but it doesn't solve consistency. I'm pretty confident my Dynamic flow calibration K value should be decent, but maybe I just can't read the test?

This is a test 20mm x 40mm x 3mm test square.

There must be a setting that affects line starts or turns besides dynamic flow?

I am having at least 3 oddities:

  1. Either gaps between lines or lines blended together at the edges going inward for maybe 1-2mm.

  2. Surfaces in-between edges are inconsistent based on whether they are in the center of the part or at corner.

  3. There is a mid-line ripple that I can't quite explain in the same spot relative to the 2 teardrop holes.

Thanks for the help

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Printer Settings:

Printer: Bambu Labs H2S

Filament: Sunlu ASA Black

Print Speed: 200 mm/s

Nozzle Temp: 260C

Chamber Temp: 60C

Bed Temp: 100C

Retraction Length 0.5mm

Zhop (spiral) on retract of 0.5mm

Wipe distance 1mm, retract while wiping enabled

Ironing Off, Dynamic Flow off (using calibrated value),

.4mm Nozzle, .2mm layer height with nothing changed to Bambu standard line widths.

Filament is dried. Flow, Temperature, and Dynamic Calibrations have been done.

Slicer: Bambu Studio 2.6.0.51

u/ListeningIntentlyNow — 24 days ago