Firmware 3.4.2-FINAL for Original Prusa i3 MK2.5 MMU2  

Re: Firmware 3.4.2-FINAL for Original Prusa i3 MK3/MK2.5 MMU2

The website still says 3.4.1 so where to download the new firmware for the MK3?

Never mind, I read MK3 only and not MK2.5 this isn't for standard MK3.

Re: Firmware 3.4.2-FINAL for Original Prusa i3 MK2.5 MMU2

Firmware is available for the MK3 as well, but there is no difference to the previous release.

Re: Firmware 3.4.2-FINAL for Original Prusa i3 MK2.5 MMU2

Is there any chance the printer printing at 30% after filament changes is going to get fixed?

Most prints are taking ~3x the estimated time, and after most filament changes, the speed drops.

It's very annoying having to come back to the printer and turn the knob 10 times for every single color, every single layer. That's a thousand knob turns for a 5 color, 20 layer print.

Re: Firmware 3.4.2-FINAL for Original Prusa i3 MK2.5 MMU2

We haven't noticed this, can you please share your G-code?

Re: Firmware 3.4.2-FINAL for Original Prusa i3 MK2.5 MMU2

Release Candidate 3.5.0rc1 for MK3
https://github.com/prusa3d/Prusa-Firmware/releases

MMU2 highlights:
Improved printing in single material mode (new Tx, Tc codes and T? fixed)
Load to nozzle added
Manage response improved: possibility to preheat nozzle
Fixed First layer calibration/Wizard
Filament sensor (dependency on optical sensor fixed)
T? menu changes feedrate fixed
Extruder stepper disabled during T-code execution (MK3)
Auto deplete menu improved
Filament change (M600): improved message synchronization

Re: Firmware 3.4.2-FINAL for Original Prusa i3 MK2.5 MMU2

I was told I was dumb on GitHUB a few weeks back, but it continues to be a problem - in order to use two materials with a different Bed temp, you ramp the bed temp back and forth with each layer.

I'm not interested in how "Well, *I* never do that, so I don't see why you care". I feel it is detrimental to a print to not pick a bed temperature and stick with it instead of changing it with each filament.

It also means you have to have duplicates of each filament type and color and retraction to also include each bed temperature you may want to use with another filament.

I suggest bed temp be moved to Print Settings.

Similarly, moving the prime tower position shouldn't label the print settings as "modified"? Perhaps there's room for debate there, but I don't like it. 🙂

Re: Firmware 3.4.2-FINAL for Original Prusa i3 MK2.5 MMU2

We haven't noticed this, can you please share your G-code?

Digging it out again:
M104 S235
G1 Y130.230
G1 X55.483 E10.0000 F3231
G1 X80.483 E-10.0000 F2908
G1 X49.233 E10.0000 F3150
G1 X80.483 E-10.0000 F2756
G1 X38.816 E10.0000 F3085
G1 X80.483 E-10.0000 F2571
G1 E-50.0000 F2000
G1 Y130.400 F2400
G4 S0
T2
M220 S35
G4 S0
; CP TOOLCHANGE LOAD
G1 E16.4000 F1140
M73 Q2 S95
M73 P2 R94
G1 X22.593 E57.4000 F1875
G1 X80.483 E8.2000 F941
M907 E550
G1 Y130.900
; CP TOOLCHANGE WIPE
G1 X22.218 E2.6130 F800
G1 X22.968 Y130.400 E0.0404
G1 X81.718 E2.6348 F900

This happens when there is TPU specified in the slicer. I've written it up like 3 or 4 times, if the devs care there is already a thread on GitHUB I'm nearly positive with lots more details.
See https://github.com/prusa3d/Prusa-Firmware/issues/1300
See https://github.com/prusa3d/Prusa-Firmware/issues/1270

While I have corrections to my original posts, and that's not all I've posted, it's been a month with multiple attempts and the only feedback is "This isn't a place to tell us about issues with the firmware".

Right now I just hand edit the offending lines out, or add a "M220 S100" to the filament, but it's not only a hack, it's not helping development.

PLEASE PLEASE PLEASEPLEASSPLEASE don't take this as an opportunity to tell me how disrespectful I am. Just note and fix the issue, or drop it. I am willing to help if there are legitimate questions about the ISSUE, not about my judgement.

Re: Firmware 3.4.2-FINAL for Original Prusa i3 MK2.5 MMU2

I was told I was dumb on GitHUB a few weeks back, but it continues to be a problem - in order to use two materials with a different Bed temp, you ramp the bed temp back and forth with each layer.

I'm not interested in how "Well, *I* never do that, so I don't see why you care". I feel it is detrimental to a print to not pick a bed temperature and stick with it instead of changing it with each filament.

It also means you have to have duplicates of each filament type and color and retraction to also include each bed temperature you may want to use with another filament.

I suggest bed temp be moved to Print Settings.

Similarly, moving the prime tower position shouldn't label the print settings as "modified"? Perhaps there's room for debate there, but I don't like it. 🙂

I don't have my MMU2 yet (still waiting on shipping like everyone else), but I have to agree. Changing bed temps layer by layer for the different materials is just asking for warping or detachment. The bed temp should be set based on the filament type that is on the first layer. The only time this is going to be a real problem is if the first layer has 2 filament types with wildly different normal bed temps like PLA and PETG. Not sure how that situation would/should be handled.

Re: Firmware 3.4.2-FINAL for Original Prusa i3 MK2.5 MMU2

I think, simplistically, it comes down to the highest percentage of surface area on that first layer.

The other consideration is oftentimes supports will have a minimized contact area, so one might skew to the materiel the supports are made out of. Sometimes I use a brim to hold in the different supports.