20231208 Update - I realized I done goofed on the extrudes and messed up the interior geometry. Updated to fix this issue. Also, ASA/ABS was a pretty big fail trying to print this stuff. It's just too much mass and too little build surface contact. Had massive warping and layer shifts. Ended up just doing PLA tough.
I was having a lot of issues printing the back two pieces of the BLV AMS Riser, especially while trying to use ASA.
I think the issue is that the radius is too large and the warp of ASA/ABS is able to curl those parts.
I flattened out the back and put a 1mm chamfer on it instead to help with this.