SLA prints not sticking to build plate I have been working with our SLA printer (Facture Draken) for a couple weeks now printing in makerjuice waxcast.  .  I have had some successful prints, but the majority (80%) end up as  pancakes stuck to the bottom of the resin tray. Some others break in half mid print.  

I have experimented with laying my models (round circular diks) flat on the build plate, but most of the times I place them on supports which stem from a square baseplate.  

It seems clear to me that there is allot of force being put on the models while curing on the bottom of the resin tray.  I have noticed that printing objects with a larger projection area are more likely to stick in the vat.  I assume this is because of the increased contact with the tray.  Usually it seems ~10 layers are built before my baseplate breaks away.  

Things I have tried


Pulling out the build plate, cleaning it with Acetone.  Sanding it with 80 grit sandpaper.  
Emptying the resin tray and replacing with new resin.  
Upping base-layer cure-time from from 30seconds up to 3 minutes, and variations between.
Upping base-layer count from 2 to 4.
Rotating model base 45% to start the tray peel process from a corner rather than from a long edge to reduce initial tear force.  


Anyone with experience got more suggestions on how to continue troubleshooting?
Prints could end up on tray for couple of reasons. 


Vacuum force on early layers - Usually you should lose pieces on the center of platform


Put holes or channels on platform
Very slow speed on early layers
Use smaller platform
Use tilt mechanism
Use larger support structures
Use stickier platform - Anodized aluminum is specially good 

Non-aligned platform - Pieces on side of platform end up on tray 


Align platform / tray

Low cure times - you could lose pieces around platform for DLP and whole platform for LCD ones
Resin related issues


Resin designed for thinner layers - Decrease layer thickness
Pigment settled down - Shake resin before use