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Word of warning to those with Prusa MK4 and Satin beds. There is a chance that the auto bed leveler will mess up and destroy your print surface. (lemmy.world)
submitted 8 months ago* (last edited 8 months ago) by the16bitgamer@lemmy.world to c/3dprinting@lemmy.world
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I've tried to report the issue to Prusa support but they keeps trying to diagnose it as user error. But at this point I'm at a loss and presume that it's either a firmware issue or a sensor issue on my unit.

Either way im very disappointed.

And before you ask, this is the opposite side

PXL_20240301_160413072

EDIT: I will note that this print sheet is ruined for my use case, since those patterns will be shown on the underside of my prints. But the print surface still works and can be used without issue... if you ignore the gouges that are being detailed into every print.

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[-] Zess@lemmy.world 52 points 8 months ago

What is going on with your flooring my guy

[-] the16bitgamer@lemmy.world 42 points 8 months ago

Living in a 30 year old apartment for 5 years and no way to do repairs. It was liked this when I moved in.

$1,500 CAD/Month (current market $2000) Welcome to Halifax, NS!

[-] Zess@lemmy.world 11 points 8 months ago

I'd just shove some wood filler in the gaps to at least have a smooth floor even if it doesn't look great. I feel like I'd stub my toes on that shit all the time.

[-] Chip_Rat@lemmy.world 13 points 8 months ago

What op should do is tap/slide the boards all to one end so the gaps all come together as one big gap at the less important side of the room. Maybe there's a bookcase or tv against that wall so they don't step there.

[-] navi@lemmy.tespia.org 2 points 8 months ago

And nail on small nail in the end board to keep it in place

[-] mosiacmango@lemm.ee 9 points 8 months ago* (last edited 8 months ago)

With gaps like that, it will be easier to use wood to fill them.

[-] Grass@sh.itjust.works 4 points 8 months ago* (last edited 8 months ago)

No don't. My parents house came like that when they bought it when I was like 14. The panels continue to slide and crush the filler into dust and the ends also get mashed and delayered. Sometimes big chunks came out to be stepped on like Legos already have the job of doing.

[-] Magrath@lemmy.ca 4 points 8 months ago

Those look like pretty big gaps, close to 1" on the biggest. That's gonna take a whole of woodfiller.

[-] GBU_28@lemm.ee 8 points 8 months ago

If it's a floating click together floor...Packing tape.

Put like 6 layers down long ways on the board with a foot or so sticking up to use as a handle.

Hold the tape, and kick the tape where it just starts to go up. If done correctly, it will scoot the board along in the direction you kicked. Repeat until gap is now at edge of room, ideally under baseboard and invisible.

[-] n3m37h@sh.itjust.works 5 points 8 months ago

Come to Onterrible, 2 houses in my small town are going for 2700++/mo 2 bed 1 bath

[-] the16bitgamer@lemmy.world 4 points 8 months ago

Wow such a deal! Can me and my 10 other friends live there at the same time? We are all going to Conestoga Collage.

[-] altima_neo@lemmy.zip 11 points 8 months ago

Bed leveling error

[-] p1mrx@sh.itjust.works 10 points 8 months ago

The floorists forgot to enable Linear Advance.

[-] dual_sport_dork@lemmy.world 16 points 8 months ago

I just had to read up on the MK4 because I don't own one. Apparently this machine uses a load cell on the bed to detect the nozzle touch? That means that to home Z or mesh level the bed, the nozzle has to touch the build surface. This strikes me as a rather bad idea. I can think of tons of situations such as a pointy diamond or ruby nozzle, a very hot nozzle, or a nozzle with hardened crud stuck to it all causing damage to the print sheet, not to mention the potential for damage to the nozzle itself.

Ideally the nozzle should never, ever touch the print surface. For any reason.

There's a purpose behind things like the BL Touch having a soft plastic probe on the end.

[-] infinitepcg@lemmy.world 9 points 8 months ago

In the cases you describe it should fail by ruining the print, not the build plate though. If there is something between the nozzle and the plate, it will be too far away from it after calibration, not too close.

[-] the16bitgamer@lemmy.world 5 points 8 months ago

Oh I've had my fair share of issues with this. i.e. little specs of the previous print color is stuck on the next print since I missed it during print clean up.

But if I am honest, for a normal spring steel PEI sheet it's perfect. And I prefer this to the magnetic solution like on the Mini since it lets me use Garolite/G10.

I've only seen this issue with the satin bed.

[-] captain_aggravated@sh.itjust.works 2 points 8 months ago

They've stopped using the PINDA probe?

That was the best auto bed leveling system I'd seen because it stood half a chance of ever working. The biggest problem I would see out of them was, well...the whole carriage/extruder assembly was designed by a rock chewing moron.

I used to build and maintain the printers for a little company that 3D printed parts for their products back in the beforetimes, so I've had my fair share of Prusas apart. I don't think I could design a worse mechanism if I tried.

The extruder mechanism was a demented sandwich of parts that don't make sense all made in shiny black plastic so it's hard to see their shapes. You don't build it up from one side to another, you build it up from the inside out. All the wires are supposed to route through a hole in the back of the carriage, then get pinched between the carriage and the extruder body in a couple channels that bend them at sharp right angles. The whole extruder mechanism is a demented sandwich built up from the inside out that doesn't let you easily remove and replace any of the working parts. ANY service to the extruder group, be it a new nozzle, a new fan, a new thermistor, is a complete teardown and rebuild, partially because there are no electrical connectors at that end, all the wires are 16 inches long and run all the way back to the main board. And the PINDA probe mount wasn't a separate bracket that bolts on, it's a feature of the largest, most central piece of plastic and it's attached by a thin little shard of plastic that WILL soften and deform in service.

In the case of a heavily used printer, say for production or a busy prototyping lab, you can't just have a spare extruder built up ready to bolt on and go. You can't have a hot end built up on the bench ready to swap in. If one needs maintenance or repair, it will take hours, no matter how minor the job.

It was like working on a Macbook built by BMW. I didn't charge enough for my time.

[-] papalonian@lemmy.world 2 points 8 months ago

Hey, just wanna point out that having a touch sensor built into the nozzle is definitely not unheard of, my printer (Neptune 3 from elegoo) uses the same sensor. It's not the most reliable sensor in the world but it got the job done until I got my BLTouch.

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[-] HewlettHackard@lemmy.ca 12 points 8 months ago

Did they describe the types of user error that could cause this?

[-] the16bitgamer@lemmy.world 12 points 8 months ago* (last edited 8 months ago)

Useing older firmware (was 1 version behind at the time of conversation), and a dirty nozzle which I clean regularly to prevent PETG globs from being deposited in my prints.

EDIT: The newest markings on the print bed was on the latest firmware.

[-] SzethFriendOfNimi@lemmy.world 6 points 8 months ago

The firmware they supplied with the printer?

[-] the16bitgamer@lemmy.world 5 points 8 months ago

Is there other firmware for Prusa MK4? I knew you could break a thing on the motherboard, but I thought that be some time from now.

[-] SzethFriendOfNimi@lemmy.world 5 points 8 months ago

Exactly… so I’m wondering what the user error would be. Unless it’s some weird setting update they’re thinking.

No way to know without being privy to the conversation but it makes me wonder.

[-] the16bitgamer@lemmy.world 5 points 8 months ago

This is why I presume it's either firmware/software issue, or a sensor was defective.

[-] overzeetop@lemmy.world 8 points 8 months ago* (last edited 8 months ago)

If this was during an auto level, it's my humble opinion that this is a manufacturer's defect in the machine that caused the damage. There should be proper coding to ensure that any increase in sensor pressure by (delta p) halt that machine and that there should be a pressure offset in the sensor such that a loss of signal or anomalous zero reading or lack of reading is done prior to levelling to ensure that a sensor failure has not occurred. My XL freaks out if a fan isn't spinning at the right speed, so they clearly know that a nominal operational check before the print starts is proper engineering design.

Of course you won't get anywhere. Unfortunately, a lot of 3D print failures really are user error so I suspect that's their default response and it takes them a good deal of proof to push them of that mark.

[-] the16bitgamer@lemmy.world 4 points 8 months ago

I 100% agree, however I went Prusa for their replacement parts and long term support of said parts. Rather than their quality which outside of the bed levels on uneven surfaces has been good.

[-] overzeetop@lemmy.world 4 points 8 months ago

Oh, I didn’t mean to come off as dissing Prusa in general. I ponied up for an XL and it’s night-and-day better than any previous printer I’ve owned.

[-] morbidcactus@lemmy.ca 7 points 8 months ago

Oof that's rough. I have marks on mine from bad 1st layer offset from the first time or so I used the sheet on my mk3s, but they're more just lightly shiny rather than gouges. Definitely show up on the print but it's fine otherwise, and honestly the spots aren't the worst.

What happened when that was going on? My experience with the voron tap a dirty nozzle would make the 1st layer offset too large and move away from the bed, not crash it.

[-] the16bitgamer@lemmy.world 6 points 8 months ago

Exactly as you said. I call it gouging since material is being removed. But the marks aren't deep and the print surface is completely usable. Don't have a better word for it than gouging.

As for what I was doing? Restarting a print I had to stop part way last night since the filament jammed. I looked away for a second then heard knocking from the printer and was welcomed to this beautiful new mark on my print sheet.

[-] morbidcactus@lemmy.ca 2 points 8 months ago

Wow that sucks even more, I had thought there would be a bunch of crash protections built into their firmware, prusa usually has pretty decent support so sorry you're dealing with that.

[-] the16bitgamer@lemmy.world 2 points 8 months ago

I'd hope so too but guess not

[-] Mpatch@lemmy.world 5 points 8 months ago

Now do it like 5 or 6 more times on the rest of the bed and now it's textured for extra adhesion.

[-] WaterWaiver@aussie.zone 4 points 8 months ago

So this problem is intermittent? Eep. If you're lucky enough to be able to capture a video of the full home and print start when the problem occurs then that might help; but that might be difficult.

[-] the16bitgamer@lemmy.world 2 points 8 months ago

At this point it's not like even if I did capture it, I'd get a new print sheet. I've just switch to G10/Garolite. Had good results with it before, but switch to Satin since I wanted a print bed for both PLA and PETG that didn't destroy the Print Bed.

[-] WaterWaiver@aussie.zone 2 points 8 months ago

Are you turning off the magnetic ABL, or using it through the garolite?

[-] the16bitgamer@lemmy.world 3 points 8 months ago

MK4 uses the nozzle's pressure sensor to level, no magnets from what I can tell.

[-] WaterWaiver@aussie.zone 3 points 8 months ago

Ah thanks, sorry, I was thinking of my MK3.

[-] ClassyHatter@sopuli.xyz 2 points 8 months ago

Are you sure the surface is damaged, and not just some material stuck on the sheet? Looks to me just a very thin layer of material on the sheet.

[-] the16bitgamer@lemmy.world 5 points 8 months ago

Oh I wish it was. I was even printing in clear. But sadly no it's permanent.

[-] ClassyHatter@sopuli.xyz 2 points 8 months ago

I had a similar thing happen to my smooth PEI sheet. Forgot to change sheet profile before printing and printer made some noises during printing. At first thought that the sheet is damaged, but after several days noticed that the sheet is actually fine. The noise was the extruder skipping because there wasn't enough room for the material to go anywhere, and the lines on the sheet were just a very thin transparent layer of the material. Difficult to say from the images, but the lines seem to have the texturing intact? That implies the sheet is fine. The thin lines are difficult to remove without damaging the surface, especially because you have textured sheet, so you can't use any solvent like acetone.

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this post was submitted on 01 Mar 2024
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