I print straight models and the printer prints them crooked or fails to print what do we do?
Some extra information would be helpful. What filament and temperatures are you trying to print? What is it you are trying to print? By crooked and fails do you mean the lifting/warping, that’s probably down to your z offset and not squishing the filament into the bed properly. Is the bed properly clean, washed, and IPA’d?
Note: When speaking to N00bs, Like OP (and me) ya gotta spell it out.
You said, …washed, and IPA’d?"
Now, I know what washing the bed means, but what in the hell has India pale ale got to do with 3D printing?
Most of the time you can use the search tool to find answers as India Pale seems to be quite popular on here for cleaning build plates… 
Just messing with ya…
Try searching IPA.
Have a great day…
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IPA = isopropyl alcohol, use this to wipe the bed between prints. Do not use acetone as it can destroy a PEI bed. I keep mine in a safety bottle like this
Ah … Well, it confused me, being a Stout kinda guy.
Got a Guinness in hand as we post.
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Personally, I use home brew.
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A couple questions for you sir concerning IPA and Acetone:
I keep the IPA in a spray bottle for cleaning the build plate almost after every print. Is that safe…?
What is a good use for acetone in 3d printing. …?
thanks… 
Isopropyl I use before each print, gets rid of greasy fingers, don’t touch the plate if you can help it those tabs are there for a reason, less you touch it the less you need to wash it. Acetone I would avoid, perhaps you can use it to wipe down linear rails before oiling, but I wouldn’t use it on PEI, I have destroyed a bed on my Snapmaker which was expensive as they are an odd size (I bought a Ender 5 plus PEI sheet and guillotined off the excess I could have bought a Snapmaker original plate but I prefer the gold textured PEI). Probably ok on a glass bed or maybe tufnol.
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