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Alpha 1.6.3 Unload feature
Posted: 22 Nov 2019, 01:59
by Beefeater
Has anyone tested the Unload feature yet? I was hoping it would slow down the last 25mm of sparse infill to perimeter speed. But I only see a comment in G-code: "Path end 25.00[mm] slowed to Perim speed" and then it just keeps going. Nothing is actually slowed. (Tried to upload .STL and .BFB here, but "the board attachment quota has been reached".)
Re: Alpha 1.6.3 Unload feature
Posted: 22 Nov 2019, 15:57
by ksh_germany
Unload is an coasting/Island feature. Tooltip say "Slows the last path on a Island to Perimeter"
Re: Alpha 1.6.3 Unload feature
Posted: 22 Nov 2019, 16:12
by Beefeater
OK I'm confused. What does an "island" mean? I thought, e.g., when I have two solid parts, the printer traces perimeter on one, then fills it in, then goes to the second part to start the perimeter there -- that's an island, isn't it? (Still can't upload an example, dammit. The board's still full.)
Re: Alpha 1.6.3 Unload feature
Posted: 22 Nov 2019, 16:20
by ksh_germany
i hope this Video will help to understand what Island/coasting is
https://www.youtube.com/watch?v=WWpdGY0V-gM
Re: Alpha 1.6.3 Unload feature
Posted: 22 Nov 2019, 16:34
by Beefeater
Thanks for the link. It only explains coasting, though. I don't think it mentions islands. What are islands?
Re: Alpha 1.6.3 Unload feature
Posted: 22 Nov 2019, 20:00
by ksh_germany
Must be the same with other Name. Like destring and retract
Re: Alpha 1.6.3 Unload feature
Posted: 22 Nov 2019, 21:19
by Beefeater
So how does Unload work exactly? Only during coast? Have you tried it? Do you have an example?
Re: Alpha 1.6.3 Unload feature
Posted: 23 Nov 2019, 01:47
by pjr
I had the same results with a test cube; the comment was in place but no slow down.
My understanding is that this feature is present to allow the nozzle pressure to drop which in turn will assist the Preload unload operation.
The unload should be based on a volumetric value anyway; this will be changed shortly, so Jonathan will check this possible fault at the same time.
Peter
Re: Alpha 1.6.3 Unload feature
Posted: 23 Nov 2019, 02:20
by Beefeater
Thanks, Peter. (And thank you for your work managing the forum!)
Re: Alpha 1.6.3 Unload feature
Posted: 23 Nov 2019, 09:35
by ksh_germany
i sliced a Gcode of 3 Towers so there is a slow down
; 'Solid Path', 0.6 [feed mm/s], 33.0 [head mm/s]
G1 X70.381 Y88.734 E15.39776 F10800
; Path end 2.00 [mm] slowed to Perim speed
; head speed 33.000000, filament speed 0.587199, preload 0.081530
; Prepare for End-Of-Layer
G1 X77.181 Y86.292 E17.41198
G1 X77.181 Y88.386 E17.44924
G1 X77.181 Y88.648 E17.4539
G1 X77.181 Y88.805 E17.44218 F1802.8
G1 X77.181 Y88.857 E17.3782 F812.8
; Blending Fan to Cool (52.7% blend)