RE: MK4 Wishlist
I have to agree about the topic dual extruders. Even if you take an approach like MMU2 I still do not think it eliminates the benefits of dual extruders. For example I am sure an many cases if you have dual extruders and you have a proper optimisation of which filament gets changed when, you will see a grate improvement on the waste topic and even overall print time. This becomes so much more relevant when you consider something like printing multiple colours in the same layer or a primary filament with something like soluable supports in the same layer. With a single filament it means having to do a filament change with the accompanied waste for every single layer of the print where the two filaments are used together. Sure, printing multi colour might not be only two colours but even then, having two extruders and optimising the filament changes will clearly improve the situation significantly.
I am also for a properly engineered multi extruder concept to bring an optimised solution rather than bulky and troublesome for sure, but in terms of concept I guess the way I see it, a combination of MMU1 and MMU2 is more sensible.
The reason I'm so adamant about a dual extruder is that, although I have an MMU, I have never really gotten it set up and functioning correctly. Fully 98% of the pieces I make have an engineering (as opposed to artistic) function, so single color is just fine. But for something requiring supports, the ability to put a soluble filament in the second extruder to print the supports would be HUGE for me, just in terms of the post-print time savings in support removal. A second extruder HAS to be way less of an engineering challenge than the MMU. Come on guys, just DO it!
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RE: MK4 Wishlist
If the weight of a second extruder is an issue, go with a bowden tube extruder for one or both. I was initially skeptical of the bowden tube on the Mini, but have had relatively little difficulty with it, although I have not yet tried any flex filament in it. On balance, I would gladly exchange the reliability of direct drive for the functionality of a 2nd extruder.
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RE: MK4 Wishlist
I am not sure if its worth it, spent too much time trying to get it right with 1 filament, never mind 2
at one time i was considering it, for me i think its a step too far
I have got rid of the bowden tube on my other printers, so why put one on the Prusa?
RE: MK4 Wishlist
A better method for tensioning the idler doors (extruder and MMU).
There is a lot of room for slop for the tension for most filaments when feeding directly to the extruder, but I've found that having your tension dialed in just right on both the extruder and MMU makes a world of difference in successful MMU tool changes.
Unfortunately as soon as you have to open one of the doors for some reason, your tension settings are right out the window and you have to go through the pain of getting it dialed back in again. There needs to be some way to open those doors for maintenance without losing your tension (or at the least make getting back to your previous tension much easier).
RE: MK4 Wishlist
Wireless connectivity.
RE: MK4 Wishlist
Wireless connectivity.
How about simplifying the wiring bundle to the extruder by making it a power line only, with everything else handled via BlueTooth?
Hear ye, Hear ye! Step right up folks and get your Government salvation here! Less than $.002 per word! Amazon.com/dp/B0B8XMMFP4
RE: MK4 Wishlist
Wireless connectivity.
How about simplifying the wiring bundle to the extruder by making it a power line only, with everything else handled via BlueTooth? Might be especially useful for the thermistor signal. That cable seems to be prone to flexing failure.
Hear ye, Hear ye! Step right up folks and get your Government salvation here! Less than $.002 per word! Amazon.com/dp/B0B8XMMFP4
RE: MK4 Wishlist
Wireless connectivity.
How about simplifying the wiring bundle to the extruder by making it a power line only, with everything else handled via BlueTooth? Might be especially useful for the thermistor signal. That cable seems to be prone to flexing failure.
No thank you. It's already bad enough when a flaky BT signal makes you mouse jittery or glitches your music. Those are just annoying, having your 3 day print ruined because BT freaked out would be rage inducing.
RE: MK4 Wishlist
Yes you are right tension about the door and screw, had to print a new one
if we could some how get rid of thermistors all together, like no wires to the bed or even hot end ,i know its not possible. But hey a silent printer no wires and no break downs, blocked nozzles, no calibration....And a bed that just stick enough, but never fails just switch on and print, print in such a way you can come back to it and is just perfect!
i know that i cant happen at the moment, but how good would that be.
G
RE: MK4 Wishlist
Do we know if XL is based on MK3s or will be improved?
Like MK3s XL or MK4 XL?
RE: MK4 Wishlist
@valiran
Probably just the Prusa XL.
There will be 4 printers:
- MK series as in the MK3S or MK4
- SL series as in the Prusa SL1
- Mini series as in the Prusa Mini
- XL series as in the Prusa XL
--------------------
Chuck H
3D Printer Review Blog
RE: MK4 Wishlist
Do we know if XL is based on MK3s or will be improved?
Like MK3s XL or MK4 XL?
XL will be completely new design, with new parts like 32-bit controller board (similar to Buddy that's in MINI), linear rails, probably direct AC heated bed (don't quote me on that), new extruder and most importantly they don't want to do i3 (bed slinger) for larger volumes => it will use Core XY kinematics.
MK4 or whatever will be the successor to MK3(S) will probably be i3 style, with new controller and some other things.
RE: MK4 Wishlist
Do we know if XL is based on MK3s or will be improved?
Like MK3s XL or MK4 XL?
XL will be completely new design, with new parts like 32-bit controller board (similar to Buddy that's in MINI), linear rails, probably direct AC heated bed (don't quote me on that), new extruder and most importantly they don't want to do i3 (bed slinger) for larger volumes => it will use Core XY kinematics.
MK4 or whatever will be the successor to MK3(S) will probably be i3 style, with new controller and some other things.
From what I hear, most of this is true. I cannot confirm the AC bed. I have not heard that.
--------------------
Chuck H
3D Printer Review Blog
RE: MK4 Wishlist
@josefprusa
Thank you Josef, this makes complete sense then why you are not considering the enclosure. I would like to see some concept of an enclosure though, even if it is for home printing, which has some kind of temperature control mechanism rather than just being static. I would also like to see the ideas with a "built-in" dry box for the spool holder, so by default the filament is kept dry while on the printer. I don't know whether something like this is already available, but I have not seen it anyway.
I also fully agree with the touch screen topic. A bit bigger screen with improved graphics could probably enable even more information at any one time to be available at a glance, but as for a touch screen interface, I do not think it would add all that much to me.
Another thing that I would like to see is some kind of well engineered combination of the MMU2 capabilities for multi materials and a multi extruder simultaneously so one don't have to chose between the MMU and MMU2. I still think that there are so many instances where a multi extruder is just so much more effective and efficient than just the ability to automatically swap filament. One of those examples is trying to print with a different material for supports which can end up consuming significantly more filament for doing the filament swaps than what is actually consumed by the printing of the model itself.
RE: MK4 Wishlist
@gnat
I don't see that as an issue. All positioning parameters are already captured when there is a mains drop. Could do the same for a B/T or extruder command drop. Just takes a bit more programming and processing with feedback to confirm that a given command was actually executed.
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RE: MK4 Wishlist
I LOVE the textured sheet. Prusa could think about other patterns (carbon fiber texture, fabric, swirled aluminum) that would provide face finishes. I know that it would require a different process, but thats what engineers are for!
FWIW, touchscreens are fairly difficult to layout in such a way that you can get accurate actions. See Apple's published papers on UI design for touch.
RE: MK4 Wishlist
@reddawg
I agree with you on the MMU. As a point, the MMU continues to be the biggest pain in using my MK3S. I would think that a modular approach could be adopted. One could use a very small stepper (NEMA-11?) for loading and unloading, driven by a Arduino teensy with a user printed Y-connector. Think of it as a decontructed MMU that is extensible. The whole MMU concept creates problems in cleaning bowden teeth, unjamming things at the extruder, the mmu selector, etcetera. Once I finally get the filament loaded into the nozzle, everything works beautifully! (until the next filament change) I have given up on multicolor/multi-material prints due to the MMU's propensity to screw up.
RE: MK4 Wishlist
To me the MMU sounds like a lot of pain.
one reason i went for the Prusa was because it did not have a bowden tube, which i dont like at all
bought Capricorn blue ptfe tube, what a waste of money. the tube is way too tight for a long length, may be hot end is ok
RE: MK4 Wishlist
To me the MMU sounds like a lot of pain.
My main complaint with Prusa over the MMU is that they don't make it clear that it is still very much a work in progress and is somewhere in the late alpha or early beta stages. It is actually a decent design with a lot of promise, but it is no where near the plug and play experience that the MK3 itself is. I spent a couple months getting mine working, but now that I understand it and have things tuned right it is flawless unless I do something stupid (feed it bad filament, mess with something, etc..). I did almost throw out the whole printer during the early days though...
bought Capricorn blue ptfe tube, what a waste of money. the tube is way too tight for a long length, may be hot end is ok
I've replaced all the PTFE except in the extruder in my MMU setup with the blue Cap. Works great. Between it's more slippery nature and more flexible (compared to what Prusa sent) it drastically altered my ability to get the MMU to function. Then it was down to getting the IR sensor to play nice. I was lucky and happened to get it for less than half price though. At full price I'd go with just using a large ID tube like most people do.
RE: MK4 Wishlist
yes you are right about the filament sensor, i have had the printer nearly a year and only recently got it to work how it should.
Had to put spacer washers under the sensor, then had to swap the wires over, then it all stared to work nice