Unlocking a little more build volume (with caveats)
A video on using the additional Y axis available on the CORE One to print larger objects.
Essentially you can modify the bed size and use extruder offset feature in Prusa Slicer to access the additional 20 mm, with the caveat you would need a larger build sheet if you actually need the bed in that space, and you would have to take into account the lack of direct bed heat underneath. But if so you're getting a "pseudo" 250 x 240 x 270 build volume (if you use the math of some of those 256^3 CoreXY machines it's more like 252 x 240 x 275 😊 ).
Nice that Prusa is giving a little more than advertised here instead of less.
RE: Unlocking a little more build volume (with caveats)
This was a great discovery, its wild that Prusa arent utilising all the space considering its a pretty significant limit and probably puts of a bunch of customers. I need to try this, and measure the temps on the overhanging part to see how much is left out there on the surface.
RE: Unlocking a little more build volume (with caveats)
Yeah the only thing I can think is that top priority was the conversion kit / reuse of MK4S parts for the CORE. If they had more time maybe we could've had a setup where the old build plates can fit, and the printer could detect them, but the actual heat bed were longer and supported a newer, longer sized sheet. But again that would be one less part transferrable from the MK4.
I think someone on reddit suggested they could have a software feature that reconciled the amount of the print that actually sat on the bed but allowed the object to extend over the (standard) edge for a certain amount of distance (e.g. like the ball in the video - doesn't need a larger bed, it just grows to use more space as it prints).
This was a great discovery, its wild that Prusa arent utilising all the space considering its a pretty significant limit and probably puts of a bunch of customers. I need to try this, and measure the temps on the overhanging part to see how much is left out there on the surface.
RE: Unlocking a little more build volume (with caveats)
Yeah the only thing I can think is that top priority was the conversion kit / reuse of MK4S parts for the CORE. If they had more time maybe we could've had a setup where the old build plates can fit, and the printer could detect them, but the actual heat bed were longer and supported a newer, longer sized sheet. But again that would be one less part transferrable from the MK4.
I think someone on reddit suggested they could have a software feature that reconciled the amount of the print that actually sat on the bed but allowed the object to extend over the (standard) edge for a certain amount of distance (e.g. like the ball in the video - doesn't need a larger bed, it just grows to use more space as it prints).
This was a great discovery, its wild that Prusa arent utilising all the space considering its a pretty significant limit and probably puts of a bunch of customers. I need to try this, and measure the temps on the overhanging part to see how much is left out there on the surface.
I wish they separated it more from the mk4 to make it a bit better 🙂 So If I understand it correct I could use any bambu bed to make use of the extra space, not a specific one?
RE: Unlocking a little more build volume (with caveats)
Watch for a bigger heat bed in the CORE One S 🙂
I wonder if the power supply would cope with the extra heated area.
RE: Unlocking a little more build volume (with caveats)
Oops - having now watched to the end of the video I realise that wasn’t an original idea!
RE: Unlocking a little more build volume (with caveats)
Yes, any sheet designed for a 256x256 Bambu should fit. It will be "close" on the sides, and it won't have the cutouts for easy centering like a Prusa sheet. So you have to be careful to get it in there correctly so it doesn't touch the "squeezed in" sides of the printer. And only pick a sheet that's stiff and flat (not one of those original BL "cool plates" that are somewhat thin and floppy if memory servers). There shouldn't be any problem at the front though as there's plenty of clearance for the door.
Also, as mentioned I don't think the firmware knows to level the bed in the very front so you have to be careful if you're trying to actually print to the absolute edge on the bed itself. But as in the video it can work to some degree.
I wish they separated it more from the mk4 to make it a bit better 🙂 So If I understand it correct I could use any bambu bed to make use of the extra space, not a specific one?
RE: Unlocking a little more build volume (with caveats)
Thanks for the answer, i checked it out now on my printer, it maxes out at -19mm, so 18mm extension would probably be safe to have 1mm margin to the end stops. Its interesting since this print volume could be used for bulging prints without even swapping out the build plate.
RE: Unlocking a little more build volume (with caveats)
Yup. Keep in mind even the standard far end hits the stop at Y=221 so even Prusa is only leaving 1 mm of space on that end. And yes on the bulging prints- perfect example is a ball shaped object like in the video.
Thanks for the answer, i checked it out now on my printer, it maxes out at -19mm, so 18mm extension would probably be safe to have 1mm margin to the end stops. Its interesting since this print volume could be used for bulging prints without even swapping out the build plate.
RE: Unlocking a little more build volume (with caveats)
Bambu type print bed is now on, just need some spare parts to repair the hotend before trying to print extended parts.
Did some temp measurements with an IR gun, 100degC set on the printer was ca 90-93C on the print bed, and ca 65-70 on the extended overhang area. Could possible get better with some insulation on the bottom to keep the heat. I think that would be good enough to try doing some larger prints. When my printer is back up i will get back 🙂
RE: Unlocking a little more build volume (with caveats)
So, Loveboard replaced and the printer is now working well again. So now i tried the new print area, first a simple print just to test if i can print there. Next print is a much larger print over 5h, hope it sticks well :). Im glad it works, it was so easy to do, thanks !
RE: Unlocking a little more build volume (with caveats)
So, Loveboard replaced and the printer is now working well again. So now i tried the new print area, first a simple print just to test if i can print there. Next print is a much larger print over 5h, hope it sticks well :). Im glad it works, it was so easy to do, thanks !
Why did you replace the loveboard? Your heat issue was caused by it?
RE: Unlocking a little more build volume (with caveats)
So, Loveboard replaced and the printer is now working well again. So now i tried the new print area, first a simple print just to test if i can print there. Next print is a much larger print over 5h, hope it sticks well :). Im glad it works, it was so easy to do, thanks !
Why did you replace the loveboard? Your heat issue was caused by it?
I had issues with trying to run the obxidian nozzle, it wouldnt load filament (seems like other have the same issue), tried to fix it, broke the nozzle somehow, had to disassemble the hotend and damaged the love board apparently in the process, its kinda sensitive, at least its not expensive. I must say though that I like how quick it is to work with this hotend, it takes just a few minutes to take it apart, the love board was easily replaced in 15 minutes. Dont do stuff when you are tired late at night is also a lesson, leave it and take it next day instead :):):)
Did some large prints utilising the extended print are in PLA yesterday and had no issues with the print sticking, so far so good. Hopefully my new hardened nozzle works better and I can try the extended print area with more challenging materials and temps aswell.
RE: Unlocking a little more build volume (with caveats)
Another thought, it's mostly the purge line that sticks out ~5mm in the front corner, and the stock build sheets have corner tabs that stick out ~5mm at the back... so you could just flip a stock sheet backwards and gain ~5mm. This would still be in the heated section too so no drawback other than manual sheet alignment.
I say this because I want to print an 8x8 openGrid that's 224 x 224mm; so close that I might as well squeeze a little extra out!
Can we get 252mm out of the X axis? That would enable 6 wide Gridfinity or 9 wide openGrid.
RE: Unlocking a little more build volume (with caveats)
I've had a couple of those obxidian nozzles(the high flow version) clog to an unfixable state when switching between PETG-CF, TPU and PLA. I'm currently back to non-NF versions for the CoreOne and MK4S. I still have 5 of the HF version in the XL, but I'm being super cautious about doing a ton of filled filaments(like CF) since I'd rather not have to buy 5 new nozzles for the XL(just put the HF obxidian nozzles in there a few months ago).
RE: Unlocking a little more build volume (with caveats)
>Posted by: @cedric
> i checked it out now on my printer, it maxes out at -19mm,
>Posted by: @darksharpie
>Keep in mind even the standard far end hits the stop at Y=221
>Posted by: @darksharpie
>any sheet designed for a 256x256 Bambu should fit.
>Posted by: @sfcgeorge
>Can we get 252mm out of the X axis?
I've been printing on a 257x257 Biqu Glacier Pro since I first read this thread many weeks ago.
I have noticed that I cannot reliably print 240mm in Y. With the front offset at -19 and using 240mm depth, my print head occasionally crashed when printing high speed at the extreme back. It never does at slower speeds, but I switched to 239 so I don't have to think about it.
I have X set from -1 with 252mm width without problem. At these tolerances, it wouldn't surprise me if X could also crash at high speed, but it hasn't happened to me yet.
My settings:
Bed Shape: X:252 Y:239
Extruder Offset X: 1 Y:19
Moved the purge line by modifying the start g-code block.
change:
G0 X249 Y-2.5 Z15 F4800 ; move away and ready for the purge
to:
G0 X249 Y-18.5 Z15 F4800 ; move away and ready for the purge
RE: Unlocking a little more build volume (with caveats)
Nice touch with the moved purge line, i remove it manually atm when i need to max out the print area