RE: newest INDX picture
RE: newest INDX picture
Thank you for sharing 👍
Could the loadcell sensor be used for filament flow calibration?
RE: newest INDX picture
Could the loadcell sensor be used for filament flow calibration?
Hmm; I can't see how it could help with absolute calibration of the filament flow. (But that does not mean it can't be done...) Measuring how the nozzle responds to relative, dynamic flow changes should be feasible. Not sure whether Prusa is already evaluating the force with which the filament gets pushed into the nozzle in some way, to detect clogs?
I think the more likely use besides Z probing is to calibrate the relative XY position of different nozzles, by tapping a target pin or such. Or are Bondtech relying purely on tight manufacturing tolerances to ensure that all nozzles deposit filament in the same spot?
RE: newest INDX picture
Could the loadcell sensor be used for filament flow calibration?
Hmm; I can't see how it could help with absolute calibration of the filament flow. (But that does not mean it can't be done...) Measuring how the nozzle responds to relative, dynamic flow changes should be feasible. Not sure whether Prusa is already evaluating the force with which the filament gets pushed into the nozzle in some way, to detect clogs?
I think the more likely use besides Z probing is to calibrate the relative XY position of different nozzles, by tapping a target pin or such. Or are Bondtech relying purely on tight manufacturing tolerances to ensure that all nozzles deposit filament in the same spot?
Beside an initial level probing of the full field, I could well imagine that each time a new filament holder is docked in the extruder the distance to the plate is checked again... but at this point in time it is purely random speculation in advance of same hard facts 😀
RE: newest INDX picture
Could the loadcell sensor be used for filament flow calibration?
Hmm; I can't see how it could help with absolute calibration of the filament flow. (But that does not mean it can't be done...) Measuring how the nozzle responds to relative, dynamic flow changes should be feasible. Not sure whether Prusa is already evaluating the force with which the filament gets pushed into the nozzle in some way, to detect clogs?
I think the more likely use besides Z probing is to calibrate the relative XY position of different nozzles, by tapping a target pin or such. Or are Bondtech relying purely on tight manufacturing tolerances to ensure that all nozzles deposit filament in the same spot?
Beside an initial level probing of the full field, I could well imagine that each time a new filament holder is docked in the extruder the distance to the plate is checked again... but at this point in time it is purely random speculation in advance of same hard facts 😀
reply to myself is a silly thing but cannot alter the post anymore (the forum was sort of unreachable for hours).
Silly me the probing can be done only once as, once the prints starts, the plate moves down and away... (still thinking bedslinger 😀 )... so only one probe at the beginning of a print...
RE: newest INDX picture
the probing can be done only once as, once the prints starts, the plate moves down and away... (still thinking bedslinger 😀 )... so only one probe at the beginning of a print...
It might even be a resident calibration per nozzle which the firmware stores (Z height as well as XY lateral position). The calibration would only need to be re-done when a nozzle is changed. This assumes that there may be manufacturing tolerances between the nozzles, but that the docking is highly reproducible -- which would already be a requirement for the "probe once at the beginning of the print" approach.
During a print, a given nozzle might only come into play many layers into the print, when the bed is already out of reach. The printer could still grab each nozzle (that will be used) and check it out during an initialization phase, but that seems time-consuming and will hopefully not be required.
RE: newest INDX picture
Why should it be time consuming? Printer waits minutes during heating and chamber heating, this time can be used for nozzle calibration
RE:
Thank you for sharing 👍
Could the loadcell sensor be used for filament flow calibration?
It's OT but I like that idea (overextrusion should correlate with increased backpressure and vice versa). Maybe the ESP32 in the WIFI module has a few unused cycles to spare...
RE: newest INDX picture
It's OT [...]
Not really, since the INDX update video does allude to more tricks with the load cell which Prusa have up their sleeve. But I am skeptical regarding quantitative flow calibration. Wouldn't the measurable-force-to-filament-flow ratio depend very critically on the filament viscosity?
RE:
But I am skeptical regarding quantitative flow calibration. Wouldn't the measurable-force-to-filament-flow ratio depend very critically on the filament viscosity?
I guess it would, and probably quite a few other factors.
Now neural networks are good at this, nonlinear / piecewise correlation. Especially if I have my own print farm to collect training data and filament brand for commercial exploitation. All the pieces are in place but NN acceleration ... the ESP32 to the rescue ... nope, too old.
So taking one step back, a dedicated calibration pattern might still be of some use, especially if I'm allowed to over-extrude momentarily at the expense of print quality (I'd expect the force curve to go up sharply when the flat nozzle tip starts to "float" on a cushion of filament). But, smooth vs textured sheet would make a significant difference.
Brims might be perfect for a start-of-print calibration area...
RE: newest INDX picture
the probing can be done only once as, once the prints starts, the plate moves down and away... (still thinking bedslinger 😀 )... so only one probe at the beginning of a print...
It might even be a resident calibration per nozzle which the firmware stores (Z height as well as XY lateral position). The calibration would only need to be re-done when a nozzle is changed. This assumes that there may be manufacturing tolerances between the nozzles, but that the docking is highly reproducible -- which would already be a requirement for the "probe once at the beginning of the print" approach.
During a print, a given nozzle might only come into play many layers into the print, when the bed is already out of reach. The printer could still grab each nozzle (that will be used) and check it out during an initialization phase, but that seems time-consuming and will hopefully not be required.
My suspicion is they are expecting repeatability of the nozzle docking, similar to the XL. On the XL, you only need to calibrate the relative XYZ offset of the toolheads once after hardware changes, not at every print.
See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs
RE: newest INDX picture
the probing can be done only once as, once the prints starts, the plate moves down and away... (still thinking bedslinger 😀 )... so only one probe at the beginning of a print...
It might even be a resident calibration per nozzle which the firmware stores (Z height as well as XY lateral position). The calibration would only need to be re-done when a nozzle is changed. This assumes that there may be manufacturing tolerances between the nozzles, but that the docking is highly reproducible -- which would already be a requirement for the "probe once at the beginning of the print" approach.
During a print, a given nozzle might only come into play many layers into the print, when the bed is already out of reach. The printer could still grab each nozzle (that will be used) and check it out during an initialization phase, but that seems time-consuming and will hopefully not be required.
My suspicion is they are expecting repeatability of the nozzle docking, similar to the XL. On the XL, you only need to calibrate the relative XYZ offset of the toolheads once after hardware changes, not at every print.
that would make a lot of sense indeed! For stability over time one could even add, while the printer is warming up, a test all the nozzles involved in the print job... or just once for all nozzles upon the first print after a startup...
RE: newest INDX picture
I'm assuming the CORE One INDX upgrade is NOT going to be using Nextruder nozzles. Anyone know for sure what type will be used?
RE: newest INDX picture
Bondtechs own inductive cht nozzles.
RE: newest INDX picture
Thank you. It remains to be seen what size nozzles comes with the upgrade kit. I'll look and see if those nozzles are listed on the BondTech website yet.;
Bondtechs own inductive cht nozzles.
RE: newest INDX picture
You can choose. There’s a few threads on here about it.
RE: newest INDX picture
indeed, if you look a couple of pages back, hyiger asked bondtech and got a pretty accurate list of nozzle sizes.
RE:
Bit of a close up of the extruder here, it looks really meaty:
RE: newest INDX picture
I'm wondering why BondTech hasn't made any updates recently. Or are they letting Prusa drive? I still feel like I'm on a Kickstarter.
RE: newest INDX picture
I'm wondering why BondTech hasn't made any updates recently. Or are they letting Prusa drive? I still feel like I'm on a Kickstarter.
I have not followed any of the earlier Bondtech product launches. Have they used this "announce early" approach at all, or are they normally in the habit of developing a product and only going public shortly before the ship date? Maybe they are not comfortable with this whole pre-launch storytelling and it is more of a "Prusa thing"?