Firmware 3.1.2 - RC1 for Original Prusa i3 MK3  

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

I just installed 3.1.2 and attempted the temperature calibration and it successfully completed (actually, for the 1st time since i've had my MK3).

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

https://github.com/prusa3d/Prusa-Firmware/issues/467

Not just me - others see the screen stuck on the same message and whilst it looks like the calibration is working, it is frozen with a hot bed and never exits.

Edit: Run another factory reset - all data. Ran the self test then the PINDA calibration - seems to work now. Who knows what is going on there.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

So is this an error for everyone (i experience this too) and will it get fixed in the next update or is there actually action needed?

sadly I can report I too am having this issue. Bummer because filament detection is more useful to me then any benefits I see from this firmware. I saw a post a few pages back (page 2) saying a power cycle fixed it for them but have had no such luck.

Forgot to add, going to prev firmware did not fix, still having filament sensor issue

I too had the filament sensor issue after upgrading but the fix was simple. Hold the screen knob down whilst booting - select Factory Reset - All Data. Then run through the startup wizard again and it will work.

On a related note - I am currently running the PINDA temp calibration routine and it's been over an hour and it still hasn't finished. Has anyone else been able to run this on the latest 3.1.2 firmware or will it sit there with a piping hot bed and show no signs of completing? How long is it supposed to take? Prusa live chat wouldn't help as they were too busy 🙁

Tried a reset as you suggested (select all data) but still getting same issue with filament sensor.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

I've got the same issue with my filament sensor. It was working just before the upgrade as I used the auto-load to swap filament out. After flashing the update, it tells me to check my wiring. Multimeter says my wiring is OK, factory reset didn't fix it, flashing older firmware didn't fix it. I did manage to get hold of someone on the online support, they are just going to send out a new sensor.

I'm not convinced its that though, as I can see the laser, so it's getting power.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

I'm convinced there is something screwey in the code still, rather than a failing sensors and probes. 1 Factory reset cured my filament sensor issue, a second then made the PINDA temp calibration routine work. All that on a printer with less than 48 hours use from assembly. It's all working fine now (touch wood). Give it 2 weeks and we'll probably have 3.2.0 RC1 to play with and hopefully that'll also have linear advance back again as well as some bug fixes in this code.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

OOW (on off works) for me
Had the same issue
Switched the printer completely off, back on activated the sensor and it works as before.

I had the same issue on nearly every firmware update 😉

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

https://github.com/prusa3d/Prusa-Firmware/releases/tag/v3.1.2

Latest firmware fixes the belt status numbers and forces self test.

It's up on the Prusa downloads page as well. Don't have time to test it right yet (working remote), but was able to rebase and recompile with Linear Advance enabled. Enjoy.

MK3-3-1-2-LA-ENABLED.zip

This one works for me using LA via OctoPrint without problems.
Please everyone stop saying that LA breaks OP if you haven't tried that FW.
Printer working 24/7 since I've updated and no comm errors.
I've done prints up to 15h without problems.

Please do note that I use USB not the internal port, and I have the printer connected to a USB 3.0 port on my Odroid XU4 - not using RPi3 since it's to slow for me.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

I received my MK3 two days ago, built it in 8hrs and flashed the newest 3.1.2 before doing anything.
After that I used the Wizard and did all calibrations. The temperature calibration succeeded although the screen froze. Printhead moved from the corner a little bit to the back every now and then and after about 10-15 minutes it finished.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

As for the filament wiring error, I had the same issue, but my sensor was completly dead after the firmware update.

Got a new one and it works just fine.

Dont know if it actually had to do with the firmware but beforehand, it was working just fine.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

My filament sensor is dead also. Noticed it after 3.1.2 update.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

https://github.com/prusa3d/Prusa-Firmware/releases/tag/v3.1.2

Latest firmware fixes the belt status numbers and forces self test.

It's up on the Prusa downloads page as well. Don't have time to test it right yet (working remote), but was able to rebase and recompile with Linear Advance enabled. Enjoy.

MK3-3-1-2-LA-ENABLED.zip

This one works for me using LA via OctoPrint without problems.
Please everyone stop saying that LA breaks OP if you haven't tried that FW.
Printer working 24/7 since I've updated and no comm errors.
I've done prints up to 15h without problems.

Please do note that I use USB not the internal port, and I have the printer connected to a USB 3.0 port on my Odroid XU4 - not using RPi3 since it's to slow for me.

Using an rpi2 with octoprint (not octopi, though) and this firmware I get a checksum error about every 7 hours during long prints, which doesn't seem to impact the print. Printing the same gcode via SD card gives an identical result. So as far as I'm concerned, printing over serial works well enough.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

My filament sensor is dead also. Noticed it after 3.1.2 update.

Is yours really dead? I thought it is just a firmware bug.

Nevertheless I just tested the procedure:
- Completely OFF
- Switch ON
- Settings -> Filamentsensor -> ON
- Calibrate -> Self Test
--> First time of Self Test Run: It failed and asked me to check a thermistor (hotend oder heatbed I do not remember). However I already experienced that after initial assembly. And a second run fixed that. Therefore a bug?
- Calibrate -> Self Test
--> Second Run of the self test did walk through successfully all steps. So I assume that the filament sensor is working properly now.

Greets,
Thomas

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

Data point, and filament sensor info.

Rebuilt my Mk3 yesterday to change incorrect smooth rods (replaced under warranty by Prusa, thank you) and incorporate the R2 parts plus matthew.v8's excellent Y axis motor mount v2 and Y belt adjuster.

Flashed over to 3.1.2 final, ran a full factory reset, and configured as a new printer.

First self test failed with filament sensor wiring error.

Powered off the printer. Waited a minute or two. Turned it back on and re-ran self test and no error with filament sensor.

This is the second time this has happened to me with 3.1.2 firmware. There is a little glitch in there which requires a cold boot after flashing or it throws this spurious filament sensor wiring error.

Re-enabled filament sensor. XYZ calibration successful. First layer calibrated. PRUSA printed fine.

Now five and a half hours into a seven hour print using RPi3 and Octoprint. All options including crash detect enabled.

Looking good. 🙂

Edit: print complete at 6h 51s. No crashes, no layer shifts, no false filament unloads. Happy Bunny here 🙂

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

I tried MK3-3-1-2-LA-ENABLED.zip. Factory reset, wizard calib: At some point gibberish on the display, probably messed up calibration. Had to adjust PINDA height (which was fine before), found no proper adjustment for the test pattern. Ruined all (8 or so) test prints for the treefrog 50 um layer height.
I tried a test cube with different K settings: disabled; 10; 30; 60. No obvious changes, all edges are overextruded (bent out).
Total fail overall.

Flashed the official 3.1.2. Calibration went through without issues, prints fine so far.

- Martin

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

I tried MK3-3-1-2-LA-ENABLED.zip. Factory reset, wizard calib: At some point gibberish on the display, probably messed up calibration. Had to adjust PINDA height (which was fine before), found no proper adjustment for the test pattern. Ruined all (8 or so) test prints for the treefrog 50 um layer height.
I tried a test cube with different K settings: disabled; 10; 30; 60. No obvious changes, all edges are overextruded (bent out).
Total fail overall.

Flashed the official 3.1.2. Calibration went through without issues, prints fine so far.

- Martin

Using this firmware day to day with zero issues, but I haven't attempted a recalibration (only self test with the home calibration included). PINDA/Temp calibration is the hot thing right now, I can't figure out why everyone is feeling the need to do it though. Especially so considering the issues: https://github.com/prusa3d/Prusa-Firmware/pull/514

At this point, considering LA is coming back in two weeks, stick to stock if it's working better for you. My LA build only works reliably with sdcard (even though some people are having luck with Octoprint, someone else will always experience an issue). That confusion plus the general PINDA calibration problems that are a completely separate issue has a lot of confusion going around.

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

Using this firmware day to day with zero issues, but I haven't attempted a recalibration (only self test with the home calibration included).
Well, I did a factory reset as I was not sure if the calibration storage format was changed (stored in the serial flash I assume).

Especially so considering the issues: https://github.com/prusa3d/Prusa-Firmware/pull/514
This sounds catastrophic - one of the big improvements of the MK3 would be the probe temperature compensation, but if it works the wrong way, that's really quite a mess and means nobody has yet tested it.

Regarding LA: I was really astonished I could see no clear effect when changing the K factor. I assume it would be visible printing the standard 20 mm test cubes? I had it on stealth mode, maybe this has some influence.
I am printing from SD card (I think this machine has enough problems without adding known ones on top), so no stability issue.

- Martin

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

I tried a test cube with different K settings: disabled; 10; 30; 60. No obvious changes, all edges are overextruded (bent out).

Wouldn't that suggest that LA isn't actually running on these prints? (At least in the capacity it was originally intended and coded.)

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

Regarding LA: I was really astonished I could see no clear effect when changing the K factor. I assume it would be visible printing the standard 20 mm test cubes? I had it on stealth mode, maybe this has some influence.
I am printing from SD card (I think this machine has enough problems without adding known ones on top), so no stability issue.

- Martin

On the mesh leveling issue: https://shop.prusa3d.com/forum/original-prusa-i3-mk3-f30/first-layer-issues-look-here--t14681.html just posted this if you're brave enough to try one. 🙂

Regarding LA: It's heavily dependent on speeds. LA helps compensate for pressure buildup in the nozzle. Even though the extruder stops stepping, the nozzle keeps squirting until that pressure is relieved. At the default 800 or 600 accel, the speed of the nozzle tends to stay pretty constant throughout movements and LA being on or off has less effect (which explains why you may not be noticing much change); however, when you start playing with lower accel values like 100 or less to fix the ringing issues the MK3 has, the nozzle has a more gradual ramp up to speed and ramp down to stop. This causes the nozzle to linger more in areas and that back pressure on the nozzle creates much more "bulge".

An easy way to see this is to do the XYZ calibration cube at 100mm/s accel on stock firmware. Your corners will definitely be rounded and you'll see additional rounding at the edges of the letters. With LA enabled, 100mm/s looks just fine. 🙂

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

On the mesh leveling issue: https://shop.prusa3d.com/forum/original-prusa-i3-mk3-f30/first-layer-issues-look-here--t14681.html just posted this if you're brave enough to try one. 🙂

Are the two LA fixes any different?

Re: Firmware 3.1.2 - RC1 for Original Prusa i3 MK3

...accel values like 100 or less to fix the ringing issues the MK3 has, the nozzle has a more gradual ramp up to speed and ramp down to stop. This causes the nozzle to linger more in areas and that back pressure on the nozzle creates much more "bulge".
I am not quite sure I understand this. As I see it, LA assumes the filament between extruder and nozzle behaves like a spring, causing delayed pressure buildup and release. Modeling the nozzle as a linear flow "resistor", the system is a first order lowpass, which attenuates higher frequency pressure changes. This would mean if you make the system less dynamic by decreasing the acceleration, the effect of this "low pass" should actually decrease, not increase. As you describe it, I wonder if there is another bug in the motion system (like with the PINDA temperature compensation).

Regarding "ringing" - do you remember Josef announcing to use the microstep table correction in the Trinamic drivers in order to remove these artifacts? I wonder if these "ringing" patterns (which I see on my benchy as well) are caused by stepper motor nonlinearities or structural vibration.

Did you try jerk limiting as well? Actually jerk limiting is not that relevant for stepper motor control (in contrast to voice coil or low pole count three-phase motors), but it attenuates high frequency energy content of the motion profile, which might also help.

- Martin