Strange problems, einsy broken ??
I have some strange issues. My mk3s is only maybe half a year old. Worked without bigger issues. I print since months with octoprint and a rapberry pi 3b+.
Never any bigger issues. Yesterday i printed over night and work a vase. This vase printed particular bad with bad quality and strange holes., but this issnt the point.
as i came from work the printer and raspberry were still on. I ignored it because later i wanted to print some other stuff. The printer restarted many times, i recognized it because the fans blow a secound at full when it restarts. i wiggled the cables on the botomside of the hotend, because i had a broken temp sensor cable a while ago, thought as a temp runaway protection it might restart. But i couldnt reproduce this problem
It gets more strange. If i disconect the usb power cable from the pi and put it back on, the printer restarts. The power over the ramsy is not conected to the pi. Pi gets power only via usb.
I noticed that both the z axis motors were permanent little noisy, as i touched them both were eqal warm. Al other motors were at room temperature. Now strange: if i push the knob long to adust high, the noise dissapears, just to come again at about an full turn of the motors.
When i disconect the power of the rapsberry it has no effect.
Octoprint is not more able to connect to the printer.
Print via sd card i have not tested because in germany its now night and i have to get some sleep. Anyone any ideas?
RE: Strange problems, einsy broken ??
The board that drives the printer is designed to reset when USB is connected (it has to be that way for the firmware boot loader that handles upgrades to work). If you have a dodgy USB connection between Pi and printer it will cause the printer to keep resetting. When you removed the USB to the Pi its the same as removing/reinserting the USB as far as signal connection goes so the printer reset.
The steppers when on will be warm, sounds like the z axis motors were on in position holding mode which will make them a little warmer so thats not a problem.
RE: Strange problems, einsy broken ??
ok i cant edit my original post wicht i wrote with smarthphone.
The Raspberry is conected via the GPIO Port, but i didnt conected the 2 pins for Electric power. i want the pi to be always on because of webcam observation (fire hazard). if i see things get out of control i can shut the whole printer down wia WiFi power plug adapter, and the PI still remains on. so the only usb cable which is attached is to the micro usb powering port of the pi and a wall smartphone charger.
so there is no USB conection betwen the PI and the einsy board, they comunicat(ed for half a year) only via gpio port.
i choosen this connection method (no poer connection betwen einsy and PI) because elsewise the raspbery will power the printer with power and gets the display flackering when the PSU of the printer is turned off.
so, i need a clue here what happened and what is broken. there is no possibility of connecting to the printer via GPIO anymore. i guess it must had happened due the idle time of printjob finishing and comming home time, with should been about 4 hours.
one more strange thing: due the hight of the vase i was able to turn the axis via knob all the way up. when it reached the very top it didsplayed +9. there was only the possibility to turn it down to "0" afterwards, but not till the bd. so i guess the einsy lost some of its calibration in this time.
i managed the selftest and calibration process without any issues after this.
i need some more input here and help to figure out the problems. but i guess either the pi or the einsy are broken because of unknown reasons. because the pi is working well with the exeption of the gpio connectivity
i checked the 4 fuses of the einsy board, they are fine.
RE: Strange problems, einsy broken ??
The Z height one is easy. If the printer is reset then where ever the print head is located is the printers home (x=0, y=0, z=0) as it doesn't know any better until the printer performs a homing sequence. If the z axis is already up when you switch the printer on then the control knob method of moving the z height will only let you go down to zero as a safety function. That is why before every print the printer will re-home if you are using the standard prusa start gcode.
The fact that the z height was reset to zero would suggest that the einsy either lost power or reset for some reason. Tracking the cause down is probably not going to be easy though. Personally I would remove everything pi related and do some prints from the sd card. If you still get issues running the 'stock' setup then you know its the printer and so can concentrate on that.
RE: Strange problems, einsy broken ??
i tested printing direct from sd card. i can choose the file, nothing hapens, and few secounds later the printer reboots. i tried flashing firmware new to the board, the same thng happens
i can manualy heat up the printer and unload and load filament. but the automatic filament loading doesnt work, either.
everytime i try printing from sd card it reboots
RE: Strange problems, einsy broken ??
A common reboot issue is a bad bed heater... but another common thing folk do is pressing X select button when starting a print from SD. X is reset, not select.