Im cutting lettering out of 1/4 inch birch plywood purchased at lowes. Calipers puts thickness at 0.2 with masking tape. Setting : Cut. Speed 145. Full power. 1 pass. I finally got the thickness of uncertified material at 0.3. SO 0.3 in comes in setting for focus height. The first 2 words cut out so perfect. Amazing. Now the same setting and same piece of plywood will not cut through. I have this happen on other occasions. Ill reboot the glow forge. Cancel print> reload the design> manually re enter the manual settings and have a correct cut. This time not cutting through x3.
No particles under board. Crumb tray clear. I have cleaned the lenses and mirror.
What am I doing wrong to cause this inconsistency