Crash Detection doesn't home - it homes to center and x/y axis coordinates are off - Assembly and first prints troubleshooting

RE: Crash Detection doesn't home - it homes to center and x/y axis coordinates are off

rmm200 — Sat, 18 Jan 2020 00:10:54 +0000

Don't use your polymer bearings until you have a reason to. Enjoy your printer now that it is working well.

RE: Crash Detection doesn't home - it homes to center and x/y axis coordinates are off

MotoGSXR — Fri, 17 Jan 2020 23:34:36 +0000

@joantabb

LOL you're probably right, should have lubed them anyway.

@robert-rmm200

I did loosen everything and found that the bearing, without it mounted, was still sticking. I lubed it and now it moves mores freely but still feel some slight resistance to it. I was able to get it to successfully print something but ordered replacement LM8UU Polymer bearings just in case.

RE: Crash Detection doesn't home - it homes to center and x/y axis coordinates are off

rmm200 — Fri, 17 Jan 2020 21:27:14 +0000

Very likely your three day old bearings are fine.

If the bearing mount screws in the extruder are too tight - it will cause this. Loosen them a bit.

And don't believe the instructions - and probably don't use Prusa grease. Get a good bearing lube - and lube them properly.

RE: Crash Detection doesn't home - it homes to center and x/y axis coordinates are off

JoanTabb — Fri, 17 Jan 2020 18:13:22 +0000

Ah well, you can use it now, as you are now doing maintenance... ;-)

Personally I have always Lubed from Day one....

I don't know why Prusa say not to lube... it's a bit like expecting assembly lube to protect your race car engine without additional lube...

regards Joan

RE: Crash Detection doesn't home - it homes to center and x/y axis coordinates are off

MotoGSXR — Fri, 17 Jan 2020 17:17:48 +0000

@joantabb

No, per the instructions the bearings didn't need to be lubricated as they were already lubricated and the included lubricant is intended for maintenance. I don't know if it is the lube or if the bearing itself has failed somehow. I still need to take the bearing off the linear rod to take a look at the inside of the bearing.

RE: Crash Detection doesn't home - it homes to center and x/y axis coordinates are off

JoanTabb — Fri, 17 Jan 2020 10:23:35 +0000

@dan-byun

did you lubricate the bearings from new?

regards Joan

RE: Crash Detection doesn't home - it homes to center and x/y axis coordinates are off

MotoGSXR — Fri, 17 Jan 2020 08:47:53 +0000

I tore the x-axis apart and found that the bottom bearing has some stiction when rolling side to side, guess it failed. Sigh...3 day old printer and more problems than my CR10S.

Crash Detection doesn't home - it homes to center and x/y axis coordinates are off

MotoGSXR — Fri, 17 Jan 2020 08:00:06 +0000

I'm seeing Crash Detection about 1hr into a 20hr print. I saw it occur and it actually didn't crash into anything, crash error shows it was on the x axis. When the crash detection error is shown it doesn't home x/y to the front left corner, instead it homes to center and x/y axis coordinates are off. The print is then all shifted right. Has anyone else experienced this?