I am doing a full bed print of shopping trolley coins for a charitable event that I have printed for it before but this is the first time with the BB. All levelling (MBL) was done beforehand then stored and a test piece, then 4 coins printed with very good results. Next I filled the bed with 70 coins and set off and the result of the first layer is shown below where it is clear that the front left corner is low and there is a little front to back variation. I did a live measure of the skirt and instead of being 0.2mm it was 0.39mm(!!!) at the front but it is difficult to get to the back. For now I have micro-stepped Z to compensate for some of it but that is not an answer as it varies. I have suspected this before but this is the largest area that I have used all at once, so has anyone got an idea what is going on?