Dishwasher?
I'm just starting with my just-arrived mk3 and I think I'm having a typical problem: the PLA doesn't stick to the plate. I've tried all of the suggestions and it still doesn't stick. The only one I haven't tried is washing it -- my printer is in a place with no running water and since I'd have to take the plate downstairs to wash it, I was wondering: would just running it through the dishwasher be OK. I'm a bit clumsy and I I washed it by hand I might bang it or drop it while it was slippery -- just putting the DW would allow me to only have to [carefully] pick it up and take it back to the printer and never handle it while it was slippery or wet. I know this sounds dump/lazy, but would it harm the plate? Thanks! /bernie\
Re: Dishwasher?
I don't think so
If you are having trouble with a new build plate sticking I suggest your Z height might need adjusting.
see https://shop.prusa3d.com/forum/assembly-and-first-prints-troubleshooting-f62/life-adjust-z-my-way-t2981.html#p115876
"Life adjust Z" [sic]
i3 Mk3 [aug 2018] upgrade>>> i3MK3/S+[Dec 2023]
Re: Dishwasher?
Dishwasher definitely not IMHO. All the chemicals they add to the detergent to make glassware shine etc is going to contaminate your PEI. I would imagine dishwashing a PEI sheet would result in nothing sticking to it ever again. Like your delicate woollens, hand wash in mild washing up liquid solution only! 🙂
Re: Dishwasher?
just hand wash with hot water. even just one side. dawn works the best.
I have a Prusa,therefore I research.
Re: Dishwasher?
Dawn works like a champ, I also learned after the wife moved to Palmolive due to it being on sale that it does not work. But, Dr Bronners liquid castile soap works slightly better than Dawn.
Re: Dishwasher?
Pictures of your attempted first layer may help.
Re: Dishwasher?
isn.t it crazy? I only have to wash it every 6 prints or so
I have a Prusa,therefore I research.
Re: Dishwasher?
And I never washed mine. IPA and Acetone works for me best.
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Re: Dishwasher?
I would make sure to ELIMINATE drafts first.
The MK4 should absolutely come with at least an option for some sort of ultra cheap snap together enclosure, imho. And of course include the clip that is missing in the extruder that keeps the Teflon tube locked into position, and of course a proper end plug for the filament sensor which literally begs people to fry the thing. 
Re: Dishwasher?
Here are instructions for a very cheap way to do it as well as the more expensive LACK table bases one
https://www.prusaprinters.org/cheap-simple-3d-printer-enclosure/#_ga=2.196331052.1887260644.1542203104-314787885.1542203104
this photographers light box works fine for ABS and I have been using a variation of it on my big Delta for years
Re: Dishwasher?
All the chemicals they add to the detergent to make glassware shine etc is going to contaminate your PEI.
Re: Dishwasher?
Try this,
1- Clean your hands,
2 - I had the same problem, then after washing 3 x times with dish washing soap(let the dirt get soft), it was ok again,
put steel plate on printer, then clean it again with 98 % alcohol, then print.
(you could also do first clean with disk wash, then clean with acetone, if you print all day long do this 1 of 2 a month.)
3 Let steel plate cool down, then you can take off print, steel plate need te be cool, otherwise you will damage it.
4 Try different filament , pla abs etc, different brand.
(calibrate z layer with the printer hot). And pla and abs there is temperature difference.
I had if i did first layer, there was air under de first layer, then you know it is wrong.
I had after testing that the nozzle was to close to the bed, check this, if it is to low, it wil not get enough filament to the plate, you could try with the nozzle to high, and then lower it with steps, then suddenly you will see it is ok again.
I had also that prints always workt, then suddenly it failed, everything.
After good cleaning, z layer calibration, and then first layer adjusting(with heated bed).
Z-layer adjusting could be different for every roll or different filament, in the beginning of print you could adjust this, a little of course if needed. Do this step slower if needed, or hotter, or make bed hotter.
First layer needs to be a little flatten to the steel plate, otherwise it does not stick, see example on the prusa site.
Also maintenance is needed, search for this.
And 3d printing production manufacturing, so you need to adjust things all the time.