20mm calibration cubes: all +/- 0.2 mm
wiped down z screw between 1 & 2; fine point q-tip clean between 2 & 3
tightened extruder tension between 2 and 3
lubricating the screw tomorrow (lithium grease?)
... still using open air stored 4 year old filament

#3dprinting #ender3prov2