RE: Core One crash/restart
Here are all the pics and movie that didn't attach to the previous post
RE: Core One crash/restart
Here are all the pics and movie that didn't attach to the previous post
No, still nothing showing, sorry. I recommend using the "Add Media" button (left side, above the editor window) for attachments; that one actually seems to work.
RE: Core One crash/restart
Apparently, you can't upload more than one thing?? I'm trying to upload 8. I'll try the movie "The movie attached is of a Foreign Voltage Detector touching the plexiglass side cover during a print. It shows just how electrically active these printers are."
RE: Core One crash/restart
I added a bunch. They don't show up in the post.
RE: Core One crash/restart
Agreed. I fixed the screw grounding to deal with the first issue but the second issue remains. I’ve been grounding myself before touching the printer to reduce ESD and then keeping a finger on a grounded screw and touching the bed / plate before removing. A grounding strap will be introduced eventually but so far this has solved the plate issue.
I haven’t seen any reports yet of the LCD’s dying but if you search MK3’s had zero grounding from the factory. So this was a bigger deal as ESD killed the LCD’s after a couple shocks. It would show all alien font characters on the screen if lucky and go black for good if unlucky. Core One still has time to correct these flaws.
RE: Core One crash/restart
I added a bunch. They don't show up in the post.
It's a two-step process when you go via "Add Media": You first upload them to the Prusa server, then (staying on the same screen) choose which ones you want to attach to your post.
It seems a bit more complex than necessary. The benefit is that the uploaded pictures etc. stay in a kind of personal media library -- you can easily re-attach them to anther post later if a topic recurs. And I guess they only take up storage space once on the server.
Lets see how this wentHopefully this works
RE: Core One crash/restart
RE:
@Ron S
Hi. I can understand grounding the base plate, but is it really necessary for the spring to make contact? I'm asking because I don't really know where to find said spring or the dimensions of it, or how I could reproduce it. I take it the nature of the way the baseplate is mounted prevents a less mechanical solution? I am still putting my upgrade together, so I can't really test out if there is ground. I would have thought that the heater plate's negative connection would've took care of it.
Anyways, thanks!
RE: Core One crash/restart
I would have thought that the heater plate's negative connection would've took care of it.
It's important to note that the black heatbed wire does not provide a permanent ground connection. It is connected to ground via a MOSFET, which is switched under CPU control to regulate the heater power. The red wire is connected to +24V permanently.
Such a "low side switch" is used very commonly when a logic control signal (e.g. 3.3V or 5V) needs to switch a load which runs on a higher voltage (24V in this case). The MOSFET gate can be controlled directly via the logic output this way, since it does not reside at the higher potential.
RE: Core One crash/restart
it either doesn’t matter as it crashed again. Or the static electricity just found a new path.
RE: Core One crash/restart
The new wire I ran through the bed loom to ground the bed assembly did not resolve not resolve the issue
RE: Core One crash/restart
it either doesn’t matter as it crashed again. Or the static electricity just found a new path.
Under which circumstances did it crash? When you touched the bed, or some other part of the printer? Or on its own, during a print?
RE: Core One crash/restart
this time it was during a print. It was usually crashing right after
RE: Core One crash/restart
Hmm... You had mentioned earlier that you did ground the X and Y stepper motors, even before you turned your attention to the heatbed. Could you double-check whether the motors are indeed (still) grounded? Measuring the resistance between one of the four X motor mounting screws and one of the Y motor mounting screws is the quickest way to check.
RE: Core One crash/restart
I have been checking regularly with a Fluke DVOM. All the motors are bonded to ground. However, none of the motor shafts are grounded. They are insulated from the motor housings. So the Z lift screws and the X/Y belt pulleys are wide open. Clearly insulated by the bearings. Been thinking of a grounded ball bearing of some kind to ground the xy shafts from the top. The z lift screws maybe a brush touching the screw.
RE: Core One crash/restart
I now have the X/Y motor shafts grounded. Magnet on top to a ball bearing to a lateral magnet to a screw, to a wire to ground.
RE: Core One crash/restart
