Circular and arch Prints cause Crashes  

RE: Circular and arch Prints cause Crashes

Are you sure it's prusament (i.e. does the box actually say "prusament") and not just their standard PLA? Similar problems have been reported before when using the hotter prusament profile for regular PLA.

RE: Circular and arch Prints cause Crashes

None of those parts should cause print problems. 

A photo of a failed part will be more informative at this point.  Even more helpful would be to export your bed as a 3MF, zip it, then drag the zip into the text window to upload it here.

ps: as Vintage says - normally the printer comes with a 3rd party silver, not Prusament. Unless Prusa is not doing things differently. Prusament has a distinctive open HEX pattern spool. 

RE: Circular and arch Prints cause Crashes

it just says filament on it, its a circular spoon not hex, made in EU, i had assumed prusa ships out prusamint with new printers. which profile is best then Genaric PLA or Prusa PLA? they kinda seem then same 

RE: Circular and arch Prints cause Crashes

Posted by: Tim

None of those parts should cause print problems. 

A photo of a failed part will be more informative at this point.  Even more helpful would be to export your bed as a 3MF, zip it, then drag the zip into the text window to upload it here.

ps: as Vintage says - normally the printer comes with a 3rd party silver, not Prusament. Unless Prusa is not doing things differently. Prusament has a distinctive open HEX pattern spool. 

hay I did not get failed prints the printer kept crashing then recalibrating and got back to print again. however, the crashes got annoying so I stopped the print at z 4-5mm as that served my purposes for what I was actually  doing with the print, there are however some stringy areas on the parts where some of the crashes occurred, nozzle hitting the filament I would guess. 

I also only used Pslicer to cut the parts and print unsure about how to make a 3mf(solidworks/fusion?) file but i have attached the gcode.

RE: Circular and arch Prints cause Crashes

i did not have the old stl file so i just made this 3mf

RE: Circular and arch Prints cause Crashes

Posted by: mkio9

it just says filament on it, its a circular spoon not hex, made in EU, i had assumed prusa ships out prusamint with new printers. which profile is best then Genaric PLA or Prusa PLA? they kinda seem then same 

Confirms it's not prusament. You'll want to use the Prusa PLA profile, though generic should work fine too.

RE: Circular and arch Prints cause Crashes

And crashes as you are describing are often unrelated to the part.  Usually a sticky bearing or three.  What lubricant did you pack the bearings with?  And check the value of the Status/Belt Tension.  This is useless info for belt tension, but does indicate how much friction your axes have. X and Y should be similar - 260 & 263; not 270 & 235.   For reference mine hover around 295 & 295.  Higher numbers are better, and mean you have less friction.

X and Y axes should move side to side & front to back with very little force (powered off). They should glide, and not have ANY sticky spots.

ps:

RE: Circular and arch Prints cause Crashes

And ZIP is the preferred file format because everyone can use it. RAR formatted files will be ignored by some of us.

RE: Circular and arch Prints cause Crashes

Posted by: Tim

And crashes as you are describing are often unrelated to the part.  Usually a sticky bearing or three.  What lubricant did you pack the bearings with?  And check the value of the Status/Belt Tension.  This is useless info for belt tension, but does indicate how much friction your axes have. X and Y should be similar - 260 & 263; not 270 & 235.   For reference mine hover around 295 & 295.  Higher numbers are better, and mean you have less friction.

X and Y axes should move side to side & front to back with very little force (powered off). They should glide, and not have ANY sticky spots.

ps:

 

hay

my belt are
x: 277
y: 273

based on the user handbooki believe it said somewhere between 240-300 (page 75 of the user handbook).

https://www.prusa3d.com/3dhandbookMK3S

i just build my printer from a kit few weeks ago, some of the bearings were dry when i opened the bag so i added the grease i got with my kit from Prusa, never used any other. i only have the dust lines at the end of the rods (Picture 1), i will leave large image so it is better to see.

i also noticed a few other things when i initially  assembled the kit bearings  were centered atleast not touching either side. But in the picture below they have moved over time it seems i had also gotten some u-bolts which were unevn but i was told it was ok to use them long as they held the bearings on prusa chat support, now i am  not sure. would the bearings not being centered cause issue what do your barrings look like?

as you can see the bearings are close to the center carriage part but not centered in the hole that is holding them.

i also noticed this some of the plastic is coming off the carriage it looks like one of the bolts might have riped it off but i slit a paper under it to see if there was space and there is so i am not sure if this would cause a issue later on?

also dont let the bold sticking out the nut fool you because i had gotten uneven u-bolts where one side had more threads to tighter and other side had less to tighter. so that is why they look uneven. i also did a quick paper test to see if any of the bolts were touching the bottom of the carriage they were not the closest one is in the picture below where the plastics is ripping a bit.

let me know your though if you think i should work on my belt and try to increase the numbers lose to 300 or if they are good where they are and also about the bearings and plastic ripping off.

Thanks!

RE: Circular and arch Prints cause Crashes

Good job greasing the bearings -- many don't and have issues.  My bearings are centered, but having them at the inside end probably does no harm. Changes Y axis range a bit higher. 

Friction numbers of 277 with grease is a fair number.  About what OEM bearings do.  But the U-bolts should not be touching the bed like yours are.  I doubt they'll damage anything beyond cosmetics, but I would fix it, if only to hold the bearings properly.  Bearings shouldn't be overly tight, but they also should not be able to move. 

As for the crashes, what does the Status say for them? X or Y?    Honestly, I don't see how those parts would cause a crash unless they lifted on one end.  None of them look like that happened - the one with the small segment of filament looks like where the nozzle was while the printer was deciding what to do next - not the source of the crash.

You might check all the wires - ensure they can't snag on anything.  If the nylon filament isn't inserted right the extruder cables can sag and catch on the Einsy case.  There are also cases of wires routed under the printer that if not tucked right can snag.  And, it might be worth looking closely where the U-bolts pass over the center frame: they should clear and have no chance of hitting.

And if speed is a factor, there is a chance the power supply or motor drivers are having fits.  Are you printing in an enclosure or a hot room?

RE: Circular and arch Prints cause Crashes

Im not getting into the bearings discussion as there ar way more knowledgeable people than me for that.  For future reference though once you have got your models and modifiers/settings all sorted and are ready to slice as normal you can then go to File>Save Project As and save the whole thing as a .3mf file.  This is the preferred way as it saves everything including all the settings and enforcers etc.

Its good to do as a normal part of your workflow as it allows you to go back later and easily tweak things without having to do everything again.  You can also import settings into new projects from an old one (or even just the outputted gcode files) using import config from project or import config.

RE: Circular and arch Prints cause Crashes

Posted by: Tim

Good job greasing the bearings -- many don't and have issues.  My bearings are centered, but having them at the inside end probably does no harm. Changes Y axis range a bit higher. 

Friction numbers of 277 with grease is a fair number.  About what OEM bearings do.  But the U-bolts should not be touching the bed like yours are.  I doubt they'll damage anything beyond cosmetics, but I would fix it, if only to hold the bearings properly.  Bearings shouldn't be overly tight, but they also should not be able to move. 

As for the crashes, what does the Status say for them? X or Y?    Honestly, I don't see how those parts would cause a crash unless they lifted on one end.  None of them look like that happened - the one with the small segment of filament looks like where the nozzle was while the printer was deciding what to do next - not the source of the crash.

You might check all the wires - ensure they can't snag on anything.  If the nylon filament isn't inserted right the extruder cables can sag and catch on the Einsy case.  There are also cases of wires routed under the printer that if not tucked right can snag.  And, it might be worth looking closely where the U-bolts pass over the center frame: they should clear and have no chance of hitting.

And if speed is a factor, there is a chance the power supply or motor drivers are having fits.  Are you printing in an enclosure or a hot room?

ya i am going to make sure the wiring is connected well and is not in the way of the u bolts/other things on the bottom. Then probably reprint the  arch print with the prusa profile(maby print slow as well) not prushamint and see what happens. Then probably work on centering and tightening ubolts. Then reprint and see what happens.

all the crashes i have had total 100+ have all been with Y.  
I have no enclosure as of yet i am printing in my basement usually colder down there. Based on the resting/room temp i see from my prusa nozzle and bed it fluctuates between 24-40c mostly stay around 25-32. 

RE: Circular and arch Prints cause Crashes

just did bunch of test prints lowering the speed from 100% to 70% seems to reduce if not completely stop the y crashes, but i am wondering is that normal are some parts just like that you have to print them slow or should i be able to print this parts at 100% default speed in the prusah PLA profile(using gray/silver filament that came with printer)?

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