Many thanks; will send tomorrow when I get back in the shop!
Interim followup:
My earlier 1st attempt was with test objects intentionally taller than the X axis rail ('gantry'?) which gave a 'reduced height' warning in the slicer. They were indeed reduced in height (to near-nothing) and that's when I saw the return-to-home after every object symptom.
I created new test objects 20 mm high, and got the same 'reduced height' warning in the slicer, but they printed full height. And... the print head did *not* return to home after each object's completion. Apparently I had something wrong in the original object file that was giving the slicer (or the printer) fits.
So, modified questions: Is that 'reduced height' error message just baked in the cake for one at a time printing, as a warning? Or am I still doing something wrong?
And,
I've seen references in other threads about changing the gantry height setting to allow taller objects in one at a time mode, and then arranging print order so it's always printing toward the rear. Is there any downside to doing this, as long as print order and clearances are carefully maintained?
Thank you for all your help; tell 'em I said you deserve a raise.
GregValiant 1,454
The gantry height is a safety to prevent the print head from crashing into finished prints when in One-at-a-Time mode. It is specific to One-at-a-Time.
If you change the gantry height to a larger number, the height of the build volume will go up with it. It's possible to set the gantry height up to the "Machine Height".
When a user changes the gantry height like that, they are removing that safety. That puts the onus on the user to keep the machine from smashing into prints.
There is a bug in One-at-a-Time that happens when a short model is printed last, and when the Ending Gcode has a parking move coded into it. That parking move often goes to the back of the build plate and if a taller print happens to be in the way - then too bad and goodbye tall print.
If you use do-care, think, and make a close inspection of the preview, you can sometimes plan around all of that. It really depends on:
- The layout of the parts on the build plate.
- Their relative height.
- The print order.
- Maybe some moves in the Ending Gcode (like the Creality "Present Print" moves).
3 hours ago, rv7charlie said:I've seen references in other threads about changing the gantry height setting to allow taller objects in one at a time mode, and then arranging print order so it's always printing toward the rear. Is there any downside to doing this, as long as print order and clearances are carefully maintained?
Be grateful you're only trying this now: the ability to set print order in one at a time is a fairly new feature.
1 hour ago, GregValiant said:There is a bug in One-at-a-Time that happens when a short model is printed last, and when the Ending Gcode has a parking move coded into it. That parking move often goes to the back of the build plate and if a taller print happens to be in the way - then too bad and goodbye tall print.
I wouldn't say that's a "bug" so much as a "design shortcoming". If you're worried about this happening, you can always edit the gcode file manually to add an upwards move before the end gcode. Just something like this:
G0 Z100 F1800
Will move it up so the nozzle is 100mm from the plate (assuming you're using absolute co-ordinates; most printers do).
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Slashee_the_Cow 541
Hi there! Been a while since I printed one at a time. If you could share the Cura project file (.3mf, get it set up then go to File > Save Project) and the gcode generated for your print (where it moves home) that would really help.
But this can almost certainly be worked around: I'm just looking to see if there's an easy way before I go writing a post-processing script for you 😄
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