RE: Prusa Core One - Intial thoughts......
I was surpriced by the tiny print area concidering Bambulab being a real competitor 🤔
Even though I`m a huge Prusa fan I think I`m gonna hold my horses a bit on this one. It`s tempting, but I gotta stay strong now 😂😂
RE:
To upgrade my MK4 to an MK4S costs €109.-
Then from MK4S to Core One €489.-
Totals €109.- + €489.- = € 598.-
New Core One kit costs € 1049.-
Difference €1049.- - €598.- = € 452.-
I hope my by that time one and a half year old MK4 will bring that amount when I sell it.
RE: Prusa Core One - Intial thoughts......
I highly suspected that the MK4S PC-CF parts were printed on either the AFS system or some other enclosed printer we didn't know about. The print quality was incredible on those parts.
I can get the same quality on a Mk3S or Mk4S with a lousy LACK enclosure. The key is to really dry the living daylight out of the PCCF.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: Prusa Core One - Intial thoughts......
Yeah, I've watched that video too much. 🤪 I just checked and the shot of the MMU3 is at 7:30 of the official video.
Ah yes I see - so looks like it will screw on to the outside of the frame - top rear - but also looks like the top cover of the frame has been removed? Either way it seems some imagination needs to go into spool placement again, as I assume Prusa's suggestion would be to fan them out behind the printer as before!
I don't think that would be Prusa's suggestion. They quietly (IMO) introduced an enclosure addon for the MMU3 for people that bought the MK4 + Enclosure + MMU3 bundle, that fairly neatly holds all 5 spools on the outside of the enclosure and buffer on the hinged lid. Pretty slick. Almost as slick as Chris Hill's solution. In fact what's interesting is that Prusa went with mounting spools on the outside of the enclosure for their MMU3 version, because the Prusa enclosure when ordered standalone comes with an interior spool holder, top right, just like Chris Hill's spool holder, and a bowden tube that routed to the Nextruder. Maybe they thought sticking 5 spools inside was to crowded?
Anyway, I'm going to print Chris Hill's solution, starting this evening, and have it hold me over until I get a Core One.
RE: Prusa Core One - Intial thoughts......
Ordered one pre-built ONE. Because why not 🙂 Will probably also upgrade my Mk4S's.
I think it's actually mindboggling that they offer an upgrade kit from Mk4S to One. I can't believe any other company would have done it.
My main reasons are:
1. Smaller footprint. I'm running out of space in my workshop and can really use the smaller footprint compared to my LACK enclosures
2. Better print quality at greater heights. At least on paper a CoreXY should do better with taller models.
3. I'm really not impressed at all with the "always perfect" first layer on my Mk4S's. PLA is fine but with PETG and ASA I need to manually adjust it almost every time. My old Mk3.5 and my Minis on the other hand… once Live Z is calibrated, I can just start the print and walk away. Now interestingly, I don't have the same problem with my XL even th0ugh the load cell is the same. Why? Beyond my pay grade. But I hope that the One will be on par with the XL and not the Mk4S.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: Prusa Core One - Intial thoughts......
Prusa is addressing thermal stress with the steel parts in the Core One. Thermal changes warp and twist a machine. I worked with machine tools holding .001mm, and we worried when there was more than 2C temperature change in the shop. 3d printers are far from .001mm tolerances, but they need to be better machines.
As the use of higher temp materials has gone up, PETG for printer parts is being eliminated. MK4S part changes show this.
Using steel and no aluminum in the frame for consistent thermal expansion reduces deformation, but it still grows. Example 30c delta of steel over the 270mm is .1mm. Per layer this is not noticeable. When your part comes out .1mm taller over 270mm that is usually within tolerance expectations. A 270 mm PETG part will change height by .6mm over 30c by my calculations. That is why PETG when allowed to cool to room temp usually just slides off the sheet. The thermal size change vs. steel size change breaks it free. Machine thermal size changes are currently hidden in the printed material size changes.
For current print tolerances thermal expansion is not a major concern, but the warping, twisting and stress caused by dissimilar materials in a machine frame is a concern. The temperature control for material also provides a consistent temperature for the machine minimizing any deformation caused by temperature changes. It may seem minor now, but in a few years, when XY positioning capabilities move from the current .08mm to .02mm or better, it will become more noticeable. With control of the temperature. exapansion can be predicted. Then slicers can scale parts for thermal effects on the machine and part.
MMU3 buffer, spools will work as they always have. I think we are asking is there a neater package for spools and buffer coming for the MMU3.
RE: Prusa Core One - Intial thoughts......
Really excited for this product. I’ve been meaning to jump into 3d printing by buying a Prusa for many years now…the CORE One has likely pushed me over the edge. I should have the funds saved up by spring. The only concerns I have is regarding a filter solution.
RE: Prusa Core One - Intial thoughts......
Well at least it seems the door wont break like other brands 😀
RE: Prusa Core One - Intial thoughts......
The buffer and spool holder solution might need to be a 3rd party product or opensource project (for 3rd parties to sell as kits/assembiles). I imagine some sort of sensor on each filament. When it senses more than a centimeter or so of back-feed on the filament, it would trigger a motor to roll the spool backwards to take up slack.
The Filamentalist spool holder is a good solution that's worked well for me. No motors; it uses a 1-way bearing to rewind the spool using the force exerted on the filament as it's being pushed back. It makes loading the filament easy: with the spool sitting on the holder, you simply push the filament into the tube until the MMU3 picks it up.