Core One / Print Temperatures
For me, the Core One looks like it is almost exactly right. I can see it being great for a print farm. Below is not intended as a gripe. But rather, a genuine question about the reason for the max chamber temp.
The only thing I am wondering about is why 55°C? J. Prusa mentioned printing PC. 55°C may be warm enough to get small PC parts to print without major deformation, but not larger flat parts, etc. Most of the electronics are rated to 80°C... Standard motors are rated to over 100°C. The PC-CF parts they use don't soften until over 100°C.
It feels like this could have been a 70°C max printer for essentially no production cost difference, which would have made it an ABS beast. And would have made it slightly more plausible for the various entry-level engineering materials. Maybe it would have needed more insulation? A different finish to prevent burns (or fear of burns) by customers?
Are there regulatory reasons? Anything else?
RE:
I print ABS parts with +35 in the chamber, it really is not needed to go that high.
The most warping material the we ever tried was Taulman pure PA6. That warps so hard that it can rip Prevailent off a satin plate. ABS is not in the same league, peace of cake.
In general PA materials warp more than ABS.
My biggest concern about Core is if it works in a hot workshop. Our MK4s mostly print from Nylon and in the summer we keep doors propped open. With that, the chamber temperature is teetering under +48. The ambient temperature is +43C (110F).
Another thing I'm curious about if Core can cold-start. On winter mornings, we use a 60W incandescent light to heat up enclosures of MK3S and MK4 before we can print. Honestly their beds could easily serve as pre-warmers if we disabled alarms, but we want to keep all the safeguards in place for routine operation. Czechia is supposed to be a cooler country, but for some reason this always was a problem.
RE: Core One / Print Temperatures
For me, the Core One looks like it is almost exactly right. I can see it being great for a print farm. Below is not intended as a gripe. But rather, a genuine question about the reason for the max chamber temp.
The only thing I am wondering about is why 55°C? J. Prusa mentioned printing PC. 55°C may be warm enough to get small PC parts to print without major deformation, but not larger flat parts, etc. Most of the electronics are rated to 80°C... Standard motors are rated to over 100°C. The PC-CF parts they use don't soften until over 100°C.
It feels like this could have been a 70°C max printer for essentially no production cost difference, which would have made it an ABS beast. And would have made it slightly more plausible for the various entry-level engineering materials. Maybe it would have needed more insulation? A different finish to prevent burns (or fear of burns) by customers?
Are there regulatory reasons? Anything else?
I believe the 55 C limit is because the chamber is passively heated by the print bed heater vs the Prusa Pro HT90 which has an actively heated chamber and thus able to get much hotter.
RE: Core One / Print Temperatures
For me, the Core One looks like it is almost exactly right. I can see it being great for a print farm. Below is not intended as a gripe. But rather, a genuine question about the reason for the max chamber temp.
The only thing I am wondering about is why 55°C? J. Prusa mentioned printing PC. 55°C may be warm enough to get small PC parts to print without major deformation, but not larger flat parts, etc. Most of the electronics are rated to 80°C... Standard motors are rated to over 100°C. The PC-CF parts they use don't soften until over 100°C.
It feels like this could have been a 70°C max printer for essentially no production cost difference, which would have made it an ABS beast. And would have made it slightly more plausible for the various entry-level engineering materials. Maybe it would have needed more insulation? A different finish to prevent burns (or fear of burns) by customers?
Are there regulatory reasons? Anything else?
I believe the 55 C limit is because the chamber is passively heated by the print bed heater vs the Prusa Pro HT90 which has an actively heated chamber and thus able to get much hotter.
Interesting. Just having browsed the literature, I thought it was actively heated- but maybe its just bed heated and the fan is used to keep the temp at a set point?
I started a thread on the MODIFICATION section of the posts.
What I’m encouraged about is that this is only $1000k in standard form. To be able to print PEKK and others, I’d think even $3k would be accepted by the market, and that leave $2k for mods. Though maybe anyone dealing with those materials is using a more robust machine- with the HT90 being the ‘cheap’ option?
RE: Core One / Print Temperatures
I wish they make a 350C hotend for printing PPA-CF. Maybe Core one Plus ?
RE: Core One / Print Temperatures
I wish they make a 350C hotend for printing PPA-CF. Maybe Core one Plus ?
From the day this was announced and the fact that you can convert a MK4S to a Core One, I've always felt this was designed to be the entry level CoreXY printer. If you take a close look at the internal configuration of the Core One, remove the two recess cut-ins on each side, there is plenty of room to expand the print-bed to 270x270x270 (3x3 heating tiles), add an active heater, and upgrade the hot-end to handle higher temps.
I don't know what they will call it but stay tuned for this same Core One box to be used for their second enclosed CoreXY printer.
RE: Core One / Print Temperatures
It would be interesting to know what the limiting factors are at what temps. I agree that PPA-CF would be a good add.
I wonder what the hotend, bed temp, and chamber temp interrelate. At what point do you need to swap from chamber air cooling to exterior air? Water cooling the head to keep it from overtemping. I think over 300C you need new bed coatings, or ceramic type coatings.
So more inherently expensive bits, and a smaller market- I can see costs and prices getting out of hand quickly. Having said that, I think all the tech is there. E3D has the hot ends. The ability to print the parts in BASF Ultrfuse for metal parts would be interesting. I guess we’ll know more in January when people get theirs.
RE: Core One / Print Temperatures
Is it going to be possible to get someone @prusa to chime in?
I'm interested in the Core One, but need the chamber to get to ~100C
I'm happy to have to install a little heater myself, but want to know what the max temperature of the chamber is, not the max temperature it can reach.
RE: Core One / Print Temperatures
I suspect that unless you were to somehow rework the motion system to get the steppers outside the chamber, re-work the extruder/hot end to replace parts not designed for 100c, and insulate the box...then adding heat might be possible to do safely. But since the box isn't factory insulated, you'd probably waste a lot of energy keeping it that hot, and likely components not designed to be in that kind of sustained heat would fail prematurely. Plus don't discount the fact that Prusa's focus on this release was clearly to provide a conversion path to core xy format printer, not to target the more challenging industrial grade materials. Like any other corexy option out there, you can take your own liberties/risks and test these theories out yourself once you've purchased one, but at that point you'll be the r & d department, and will need the knowledge, skills, and money to do that work. Also expect to forego your warranty. My guess is that the jump from 55c to 100c chamber temps isn't trivial, so it's going to take much more than adding a heater if you want to retain the reliability that we expect from Prusa. If it was simple, more companies would be advertising it and offering auxiliary heat sources with supporting documentation.
-J
RE: Core One / Print Temperatures
> But rather, a genuine question about the reason for the max chamber temp.
They stated the reason in the announcement, that 90% of the printed materials is in PLA and PETG.
Anything else is just a different market group and hopefully there will be a printer for that later on.
See my GitHub and printables.com for some 3d stuff that you may like.