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Love the design but my printer cannot make the oring section. It is in the right spot but when it spits filament out for the section above the oring indent it just falls down to where the oring should be. Throws the whole print off. I've gone to A LOT of trouble with this (it's the first thing I tried to print and I chose it because of the issues with filling holes, shape gaps, etc so I could learn) but I've hit a stop here with this oring section. I still can't get it to go hollow all the way through but that's a software issue I can deal with once I understand how to make this gap print correctly

Any suggestions?

Qidi Tech 1 dual extruder
standard white PLA
Various setting from 210-220 extruder temp 55-60 bed temp