I am noticing that my build plate, with fine Z layer settings <=0.08mm, results in brims that reveal what looks like variations in the glass surface. Some parts of the brim are almost transparent. Others are striated thicker. (see the pics).
NOTE:
1) 'Initial Layer Thickness' has been set to zero. if I do anything else the print fails every time because the brim is too thick and never adheres. As it is all prints warp from the thickened brim points, which is the first place the print lifts.
2) It's not affected by atomic cleaning of the extruder and the effect is repeatable although it varies a little from print run to print run.
3) It's not affected by washing the glass.
Brim 1
Brim 2 (to the left of Brim 1
Brim 3 (same position as Brim 1 and same everything except performed later)
Q1. Is what I am seeing actually glass surface variation of the order of the same size as the layer thickness, or is it systematic error in the extruder head positioning?
Note: I have been using this implement to scrape clean the glass.
Q2. Is this OK? Am I damaging the glass?
Cheers
Colin Hales