Firmware 3.5.2-RC1 for Original Prusa i3 MK3  

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jakub.d
(@jakub-d)
Member Admin

UPDATE: Final version of 3.5.2. is out: https://shop.prusa3d.com/forum/general-discussion-announcements-and-releases-f61/firmware-3-5-2-final-for-original-prusa-i3-mk3-t27856.html

Hi guys,
this is an upgrade of the firmware for the Original Prusa i3 MK3. Keep in mind this a release candidate (testing version) for experienced users 😎

What is new?
-> More quiet print fan operation
-> Heatbed regulation improved
-> Improved heater temperature regulation
-> Spool join for multi-material prints
-> Smarter load/unload function
-> Mintemp for MK2.5 updated
-> SD card menu is shown automatically when the card is inserted
-> Safer communication between MMU2 and printer
-> Crash detection for zero target temperature fixed

More quiet print fan operation:
This change is significant especially for low fan speeds.

Heatbed regulation improved:
Heatbed PWM now works on a higher frequency. This helps to reduce the power supplies "clicking" noises.

Improved heater temperature regulation:
When changing temperatures during the print, temperature regulation was very slow in some cases led to preheat error. Regulation has been improved. This should solve issue #1362.

SpoolJoin for multi-material prints:
It is now possible to use the "SpoolJoin" function also with multi-material prints. If some filament is depleted, the printer replaces it with next filament for the rest of print (for example if filament 2 was depleted, the printer starts using filament 3 instead). If there is no filament which can be used (all filaments were depleted), the printer waits for the user to insert new filament manually.

Smarter load/unload function:
If a user chooses load (or unload) in the menu with a cold nozzle, nozzle preheat menu automatically appears. After selecting material, preheat starts. When the nozzle is hot and the printer is ready for a load, beeper signal occurs. This function is working on single material printers with load/autoload and unload. It is not currently implemented for multi-material printers (load to nozzle, unload and eject).

Mintemp for MK2.5 updated:
"Mintemp" is now checked after a short period of preheating. This is necessary for maximum reliability on all MK2.5 Rambo boards.
---

Supported printers:
Original Prusa i3 MK3
Original Prusa i3 MK3 MMU2
Original Prusa i3 MK2.5
Original Prusa i3 MK2.5 MMU2

Download link:
https://github.com/prusa3d/Prusa-Firmware/releases/tag/v3.5.2-RC1

Firmware flashing guide:
https://manual.prusa3d.com/Guide/Upgrading+the+firmware+v1.5/66

Please report any bug here:
https://github.com/prusa3d/Prusa-Firmware/issues

As always, we wish you happy printing and look forward to your feedback!

Assembly manuals / Knowledge Base
The guy behind Prusa assembly manuals......
Posted : 08/02/2019 11:49 am
jweaver
(@jweaver)
Honorable Member

Has the issue been fixed where we are observing blips in the temperature.

Posted : 08/02/2019 2:33 pm
john.t32
(@john-t32)
New Member

Does this also fix the anoying problem when you change color using the colorprint gcode modifier and the extruder a.) leaves the fan on so the filament gets blown back. b.) after you confirm the color it then extrudes another 1"-2" of filament?

Posted : 08/02/2019 8:23 pm
george.e7
(@george-e7)
Trusted Member


Does this also fix the anoying problem when you change color using the colorprint gcode modifier and the extruder a.) leaves the fan on so the filament gets blown back. b.) after you confirm the color it then extrudes another 1"-2" of filament?

Has the issue been fixed where we are observing blips in the temperature.

What were the firmware issue numbers reported for these and I'll check for you.

Posted : 08/02/2019 9:03 pm
melody.k
(@melody-k)
New Member

The fan noise is gone while printing at lower fan speeds! Amazing. Thank you!

Posted : 08/02/2019 10:49 pm
ben.t7
(@ben-t7)
Trusted Member

Does this include that 7x7 bed leveling option or can it be added for the people who are running into issues where the bed isn't getting leveled properly anymore? I know there's a community remix out in the wild that has this and I thought it was mentioned that this was something that would make its way into official firmware but its something I would love to see.

Posted : 08/02/2019 11:40 pm
cory.s3
(@cory-s3)
New Member


Does this include that 7x7 bed leveling option or can it be added for the people who are running into issues where the bed isn't getting leveled properly anymore? I know there's a community remix out in the wild that has this and I thought it was mentioned that this was something that would make its way into official firmware but its something I would love to see.

I think the 7x7 was estimated to be implemented Mid to Late March

Posted : 09/02/2019 4:27 am
albert.o2
(@bigalky)
Eminent Member

As always, I am proud and tickled with every new update to the FW as well Slic3R:). The Prusa Team has gone way beyond the call of duty in making the MK3 the BEST 3D printer out there:) along with the BEST software period!

My hat is off to the ENTIRE team at Prusa, making the MK3 worth millions in my eyes 🙂

Thank you again 🙂

Posted : 09/02/2019 5:24 am
toaf
 toaf
(@toaf)
Noble Member


As always, I am proud and tickled with every new update to the FW as well Slic3R:). The Prusa Team has gone way beyond the call of duty in making the MK3 the BEST 3D printer out there:) along with the BEST software period!

My hat is off to the ENTIRE team at Prusa, making the MK3 worth millions in my eyes 🙂

Thank you again 🙂

ya, they are going above the call of duty with some of the slicer stuff. i got prints planed i cant be doing another firmware now. i did just get the last one installed. hard to keep up

I have a Prusa,therefore I research....
Posted : 09/02/2019 9:06 am
allanimal
(@allanimal)
Eminent Member



Has the issue been fixed where we are observing blips in the temperature.

What were the firmware issue numbers reported for these and I'll check for you.

I believe the temperature blips problem referred to is in this thread: https://github.com/prusa3d/Prusa-Firmware/issues/1405

So I guess it's issue 1405?

Posted : 09/02/2019 1:35 pm
george.e7
(@george-e7)
Trusted Member




Has the issue been fixed where we are observing blips in the temperature.

What were the firmware issue numbers reported for these and I'll check for you.

I believe the temperature blips problem referred to is in this thread: https://github.com/prusa3d/Prusa-Firmware/issues/1405

So I guess it's issue 1405?

So that one is still open then. 🙄

Posted : 09/02/2019 2:33 pm
Sembazuru
(@sembazuru)
Prominent Member


(...)
-> SD card menu is shown automatically when the card is inserted
(...)
Smarter load/unload function:
If a user chooses load (or unload) in the menu with a cold nozzle, nozzle preheat menu automatically appears. After selecting material, preheat starts. When the nozzle is hot and the printer is ready for a load, beeper signal occurs. This function is working on single material printers with load/autoload and unload. It is not currently implemented for multi-material printers (load to nozzle, unload and eject).

These are my two favorite features of this FW update. (Note, I'm actually using the 7x7 meshbed fork that includes many of these changes. I forget who provided the .hex file, but you know who you are. 😉 Unfortunately for me only the smarter unload is in my version. But I'm really looking forward to the smarter load once I hear about the 7x7 fork getting updated to this. Off to check the 7x7 thread if I can find it again...)

See my (limited) designs on:
PrusaPrinters - https://www.prusaprinters.org/social/1448-sembazuru/prints
Thingiverse - https://www.thingiverse.com/Sembazuru/designs...
Posted : 09/02/2019 8:05 pm
john.t32
(@john-t32)
New Member

Hmm Just ran into an issue where I was using prusaprint and the new release.

The print started but the heaters turned off and the print continued, I caught it in time and it didn't jam up.

Prusaprint version 1.3.10 just flashed the new RC1 and was printing from SD card through octoprint.

Posted : 10/02/2019 12:30 am
bobstro
(@bobstro)
Illustrious Member

Does the new PWM bed routine make bed warmup more efficient? I just started a print and was surprised that it seems to move 1C roughly every 3 seconds now. It seemed more like 6-10 before. I'm wondering if nozzle temps will be more stable as well. Very pleased so far.

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 10/02/2019 12:34 am
george.e7
(@george-e7)
Trusted Member


Hmm Just ran into an issue where I was using prusaprint and the new release.

The print started but the heaters turned off and the print continued, I caught it in time and it didn't jam up.

Prusaprint version 1.3.10 just flashed the new RC1 and was printing from SD card through octoprint.

If you have mesh bed leveling plugin for Octoprint check its settings as I had this happen with a Geeetech I3 clone. There is a setting in Octoprint to turn off heaters after mesh bed leveling is complete which jumps in on a G29 bed level in Marlin firmware, it might have done the same thing with you.

Posted : 10/02/2019 1:52 am
vintagepc
(@vintagepc)
Noble Member

While I am thrilled with the PWM and fan noise improvements in the RC, I encountered #1522 which is rather concerning as it severely impacts my confidence in running larger prints and knowing they'll just "work" instead of being a coin toss as to whether I'll get a print or waste a few tens of meters of filament. Per the issue, seems like it's already present in 3.5.1 but the PWM changes seem to have made it occur earlier when doing lots of high-flow extrusion (solid infill, for example) in the RC than 3.5.1

Posted : 11/02/2019 10:11 pm
pepeu
(@pepeu)
Active Member

Could you please give us a separate XYZ selftest? I've had some issues with the Y-axis recently and I haaate the stupid test waiting for it to cool down, then doing the heat test again before getting to the XYZ part. I want to punch the printer each time.

Posted : 12/02/2019 1:15 am
brian.b48
(@brian-b48)
New Member

Hi all, I just downloaded the latest 3.5.2 firmware for my MK3 and my prints are failing at the first layer. The 9 point bed leveling occurs, the nozzle wipes the excess filament on the front of the print bed, and then it just stops in the middle of printing the skirt on the first layer. No warning comes up on the screen, and the temperature of the nozzle and bed just start to drop. I still have the option to "Stop Print" and "Resume Print", so it seems like it thinks it is Paused. I tried a Benchy, and I tried a model of something I printed not 2 hours ago on the previous 3.5.1 firmware, both with the same results.

I re-flashed the firmware back to 3.5.1 and all is fine now. Is anyone else having this issue or knows how this could be fixed?

Posted : 13/02/2019 3:13 am
karl.w2
(@karl-w2)
Estimable Member

Is anyone experiencing layer shifts with this firmware, or is this coincidence? My first 2 prints were successful, but my latest two have had layer shifts. Always in Stealth mode. The first was about 2mm on the Y. The second was about 1 cm on the X and 2.5 cm on the Y. Same layer. Both shifts of the second print occurred at the same time.

Posted : 13/02/2019 4:11 pm
vintagepc
(@vintagepc)
Noble Member


Is anyone experiencing layer shifts with this firmware, or is this coincidence? My first 2 prints were successful, but my latest two have had layer shifts. Always in Stealth mode. The first was about 2mm on the Y. The second was about 1 cm on the X and 2.5 cm on the Y. Same layer. Both shifts of the second print occurred at the same time.

Did you perhaps get bitten by https://github.com/prusa3d/Prusa-Firmware/issues/1522 ? If your printer was doing a small enough operation when interrupted that didn't take it very far this'd only cause a layer shift and not going off the print bed/crashing.

Posted : 13/02/2019 5:47 pm
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