Crash detected mk3s  

RE: Crash detected mk3s

Kit or prebuilt?

Turn power off and manually move X and Y in both directions. Is it smooth or do you feel binding?

Watch from behind. Are cables or zip ties anywhere they can be hit?

Grease on the rods is not what is needed. You need grease inside the bearing, and the bearing shields keep it there.

Never put grease or oil on the threaded rods. They must be clean, or you damage (dissolve) the Delrin nuts.

RE: Crash detected mk3s

@robert-rmm200

Hey Robert, it was the kit I purchased.

With the system off/unplugged moving the bed and gantry they do move full motion without any binding. I'll try taking the bearings off and try adding grease to the inside see if it rides any smoother after that. You're correct adding grease to the rail was pointless it was all cleared off to the sides in a pile.
As far as clearance the zip ties do clear the bed or any of the sides.

Oddly the Z when first built would not go the full height and kept failing during the caibration, greasing the screw rods fixed that issue. But it's good to know it should not be on there though, don't recall seeing anything about that in the manual.

RE: Crash detected mk3s

PINDA should be 0.8 to 1.2 mm higher than the nozzle. Yours looks really low in that last photo. You may want to measure the clearance, just to be sure.

RE: Crash detected mk3s

And now that you have the oil / grease off the threaded rods - loosen the screws in the Delrin nuts.

Move Z  bottom to top a couple of times.

Tighten the Delrin screws again. This helps them center themselves. May help with any Z problems.

Delrin is much like Teflon. It wears in. My cross threaded nut fixed itself with a little use. And twisting.

RE: Crash detected mk3s

Yup took the z apart to remove as much grease as I could from the screw and the delrin nuts (that wasn't fun, lesson learned). I've moved it up and down the z a few times before tightening the delrins again.

The pinda to bed height is 1.11mm

At no point during the print does the pinda, nozzle or anything hit, at a completely random point in the print it just stops saying the crash detected

RE: Crash detected mk3s

At least your printer is in better shape now than it was...

Something is giving a resistance bump in Z travel. Some cable hitting something...

One thing we have not tried is raising the Z motor dust covers a bit. They should not touch the motors.

RE: Crash detected mk3s

When it crashes, what does the LCD report for current print?

ps: 

RE: Crash detected mk3s

Tim I'd agree 100% that does look low.. not sure why at that angle it looks so low. But I triple checked that.

That's a better shot.

I did move the covers up a bit, initially I did have them far too low

.

The fail status for the last print says power fail 0, failam runout 0, crash x 5 (this is usually under 10) y 0. When it does fail, it will home again and retry to print, but when it tries to home the z after it gets to the last y position it will keep looping the homing,  but won't even try to continue past that z home and goes back to crash detected and if I want to continue.

Well this is interesting, one suggest I seen in the book was to try disable to crash detect... This is the result of that. Definitely looks like it's an x axis issue

RE: Crash detected mk3s

So the crash is X, not related to Z.

Usually, this is dry bearings or a crushed bearings.  X should slide side to side with absolutely NO friction, stickiness, or snags from stop to stop.

If you tilt the printer, the extruder should slide from the uphill side to the downhill side as you approach 45 degrees.  

Another test is to look at the mislabeled "Belt Tension" numbers on the LCD.  Anything below 250 is problematic and shows very high friction.  I worry about numbers below 260, since a lot of people with X crashes have numbers below 260. 

The MK3s extruder housing has been known to crush the bearings if screwed tightly together. Especially self printed parts. Loosening the screws near the bearings a quarter to half turn is usually enough to relax the fit and free up motion.

RE: Crash detected mk3s

After rereading everything - post a photo of the entire printer, front, side and read views.  That last image of the frog being condensed into a 1/8" bar is a sure sign your X axis is snagging, probably something is hitting, or your X belt drive gear is loose, and when it does catch, it flags a crash. A loose gear can also explain why the slowest part of the print seems to work, but fast moves derails it.

RE: Crash detected mk3s

Hello again Tim, thanks again for all the help.

I've check the belts again to verify they were a bit tighter, unfortunately still crashes.

I tried the tilt test, it does seem to move free, however a few random times it did stop at a random spot. I could try take the x apart and add a bit of grease to the bearing, just to make sure

RE: Crash detected mk3s

The four views look reasonable enough, but the video is most telling.  Whatever that cable is dangling off the side of the printer extruder looks like it can easily snag on the bed and cause the problem you are having; and the cable tie looks like it will also limit X range. I'd completely remove the extras and try again.

RE: Crash detected mk3s

In the clips the thing dangling from the extruder or on the left of the x rails is the belt.. I removed it partially so see how it slid without the belt hindering it. it slid smoothy but did stop randomly every few slides I did, the belt while sliding didn't catch when it stopped.

I have an odd feeling the bearings are where the problem might be, not sure how easy this will be but I'll try swap the z bearing with the x and see if the x moves better or if then the z starts having an issue.

RE: Crash detected mk3s

When you have the bearings in your hand - clean and grease them. No telling when you will get another shot.