About heating bed - when it is needed

[JohnA136]

Even with a heated bed ABS still tends to warp... PLA will work better with a heated bed, but it isn't requied.

This is true, many time you have to combine a heated bed with a closed print chamber to reduce warping. ABE does not like cold drafts and rapid changes in temperature while printing. Even with the best conditions, large and very long prints are sometimes difficult with ABS.

Here is a 36 hour print with a Replicator 1 that had minimal lifting of one corner about 20 hours into the print.

IMG_0466.jpgIMG_0482.jpg