Prints Coming Out w/ Strands

Up until today I printed abs with a heatbed, 2.5mm thick glass, and then kapton tape. It worked pretty well until the glass cracked trying to remove a piece. So until I get another piece of glass, Im trying to print on the heatbed with a layer of kapton tape. But for some reason my prints now turn out like the attached image. Thats supposed to be a hollow cylinder. Any ideas about whats going on?

Printing abs at 230/120C on a mendel90. Thanks for any help.

The print surface isn't flat/rigid like glass. Just buy a $2 picture frame at the dollar store and cut the glass with a cheap glass cutter from your local hardware store and you'll be back in business.

Thanks that worked perfectly. I thought I had messed something else up, didnt think the glass could make such a big difference.