Recently prints aren't sticking to centre of bed - e.g if I print a grid of 25 identical models, the ones in centre will not attach to build plate. Models near edges stick to build plate fine, on all 4 sides, plate is levelled fine. No visible damage to screen, models on sides print fine and the models in centre stick to the FEP. Previously printer worked fine.
- Cleaning build plate with IPA and also with acetone to ensure degreased.
- Cleaning FEP with alcohol
- Replaced FEP
- Tried adding PTFE spray (v small amount) to film to encourage less sticking, issue persists.