If I may add some info : To home a buildplate, is for the printer to get information about where the buildplate is located along the Z-axis. The "0-leveling"-procedure is required, so the printer knows at what level of the Z-axis the FEP-film is at the resinvat. For this reason I recommend to use an empty resinvat to use for "0-leveling". An alternative is -as widely suggested- to use a thin paper sheet or use the thick papersheet which comes with the printer. The FEPfilm is usually 150 micron thick. Some use 100 micron as it is cheaper (but also more flexible).
If I'm not mistaken this thick leveling-paper included with a printer is more thick than the FEPfilm used in the resinvat. I think you can imagine what it means for the first layer to print.
If I'm not mistaken this thick leveling-paper included with a printer is more thick than the FEPfilm used in the resinvat. I think you can imagine what it means for the first layer to print.