New 3.0.10-RC1 firmware for Prusa i3 MK2  

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

❓ in 3.0.10-alpha2 there was a (nice) new feature for the extruder calibration (10cm trick). has this been rejected for rc1 ? or does it simply lack in your list of changes ?

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

❓ in 3.0.10-alpha2 there was a (nice) new feature for the extruder calibration (10cm trick). has this been rejected for rc1 ? or does it simply lack in your list of changes ?

We decided to investigate more as it would probably require changes to the print settings.

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

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We decided to investigate more as it would probably require changes to the print settings.

ah, that's why i've to reduce the extrusion multiplyer to approximately 0.95 when printing with the alpha2 🙄 ...

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

❓ in 3.0.10-alpha2 there was a (nice) new feature for the extruder calibration (10cm trick). has this been rejected for rc1 ? or does it simply lack in your list of changes ?

We decided to investigate more as it would probably require changes to the print settings.

Speaking of settings, there were some changes in the settings repo. does it make sense to import those into my settings?

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

Speaking of settings, there were some changes in the settings repo. does it make sense to import those into my settings?
They contain setting for new supports which will be introduced with new Slic3r.

Also get ready for variable layer height 🙂

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

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Also get ready for variable layer height 🙂

that sounds promising. but i guess that'll be a feature of the slicer and not of the printer itself.
or am i wrong ❓

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

❓ in 3.0.10-alpha2 there was a (nice) new feature for the extruder calibration (10cm trick). has this been rejected for rc1 ? or does it simply lack in your list of changes ?

HI Jeff,
After updating firmware I ran "calibration/self test". where before it didn't fail now it fail's on "loose pulley - Y". I have checked the hardware and belt is tight (plucks with good tone). Any ideas

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

❓ in 3.0.10-alpha2 there was a (nice) new feature for the extruder calibration (10cm trick). has this been rejected for rc1 ? or does it simply lack in your list of changes ?

HI Jeff,
After updating firmware I ran "calibration/self test". where before it didn't fail now it fail's on "loose pulley - Y". I have checked the hardware and belt is tight (plucks with good tone). Any ideas

Richard, i have the same problem. Everything ist tight and i think that's an error in this release candidate? What to do now?

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

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HI Jeff,
After updating firmware I ran "calibration/self test". where before it didn't fail now it fail's on "loose pulley - Y". I have checked the hardware and belt is tight (plucks with good tone). Any ideas

hmm... what should i say ?
i don't know how the loose pulleye test has been implemented, but i guess the only way that this could be done is measuring the clearance of the printbed in x- and y-direction direction by finding the calibration points when approaching the pinda probe from different directcions.
this may indicate one of the most common problems: a loose pulleye as well as other issues.

so if it says "loose pulleye - y" that only means that there is a clearance in y-direction.
this can not only be caused by a loose pulleye ❗
i would check the y-carriage bearings as well... and the zip-ties... (because if they are loose as well, the whole printbed might wiggle)

if everything is assembled fine, then one might assume that the measuring process delivers some tolerance too... so fiddeling around with the probes hight distance might decrase this tolerance.

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

i don't know how the loose pulleye test has been implemented, but i guess the only way that this could be done is measuring the clearance of the printbed in x- and y-direction direction by finding the calibration points when approaching the pinda probe from different directcions.

I'd do it with the endstops.

Go to endstop, very slowly back off, and see when the endstop releases.
Kind of measuring the backlash?

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

Speaking of settings, there were some changes in the settings repo. does it make sense to import those into my settings?
They contain setting for new supports which will be introduced with new Slic3r.

Also get ready for variable layer height 🙂

Already pulled from git, and played around with it. 😀
UI is great, and looks very solid. Only thing on my wishlist would be tooltips when hovering over the curve which displays set layer height.

No time this weekend, but very much looking forward to play with it.

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

Loose pulley doesn't have to do anything with how tight the belts are. It means that the pulley is slipping on the motor shaft, so check if its grub screw properly tightened.

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

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could some skipped steps of the x-/y-motors could trigger a "loose pulleye"-message ?

➡
i mean: if the force is to high to move the axis (especially in silent-mode) maybe due to misaligned or defective bearings, the stepper itself might skip some steps. -> will this trigger the message as well ?

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

Also get ready for variable layer height 🙂

Is this different from what can currently (1.31.6) be done selecting a part and going to settings to enter values? Or just a better UI for it?

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

I'm also getting the loose pulley error in the Y axis with the 3..0.10 RC1 firmware. The first thing I did was check the grub screw in the pulley and it was tight. I went ahead and loosened it and tried to realign it with the flat before tightening it again. No improvement as I still fail the self test for a Y axis loose pulley. I also checked bearings, belt, etc and can find nothing loose. I'm wondering if it could be the end stop switch not being consistent.

Also, it also fails the XYZ calibration after the first four steps with the message to check the manual. I've had no problems with calibrating under 3.0.9, and it comes back as everything is perpendicular. Quality of prints under 3.0.9 is excellent.

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

Loose pulley doesn't have to do anything with how tight the belts are. It means that the pulley is slipping on the motor shaft, so check if its grub screw properly tightened.

Actually, it seems that it does.

I just assembled the mk2 upgrade on my mk1, and had a lot of X pulley errors, that was only corrected by loosing the belt by two teeth. During the test, the motor was clearly forcing but didn't skip a tooth.

So when the belt is tightened too much, the strong speed/acceleration used during the test is putting the mechanical tolerance to the edge, which is good to me, so that you have a way to ensure you use the proper tight of the belt !

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

It seems there is a strange behavious:

Just after the selftest, I tried to use the "move Z axis", but that triggered a move from the 3 axis at the same time: (Z almost went to the top, Y almost to the front and X a bit to the right.

May this be a bug ?

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

hi christophe
can you reproduce this behaviour, or did it happen just once ?

Re: New 3.0.10-RC1 firmware for Prusa i3 MK2

Good idea Christophe, I hadn't thought about the Y belt being too tight. It is a little tighter than my X belt. I'll try backing it off a tooth or two and see if that helps my Y pulley failure.

Btw, I had also tried the selftest in both silent and high power modes with the same results.