The bed of my Printrbot Simple Metal (model 1403) was pretty seriously warped. By "scraping" it with a power sander, I was able to make it flat!
Desi Quintans' article on bed leveling: [ Ссылка ]
Bed inspection utility: [ Ссылка ]
Surface plate: [ Ссылка ]
Roller: [ Ссылка ]
Canode spotting ink: [ Ссылка ]
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