What are the effects of backlash from a geared stepper motor used to drive a filament extruder? Question background:
I am building an extruder / hotend combination to be used with 2.85 mm filaments.
The extruder I chose is QR Extruder from Bondtech which comes with a stepper motor, with an integrated planetary gear system and a reduction of 5.18 to 1.
The motor's specification states that it has a backlash of less than 1 degree.
I have contacted the manufacturer but I could not get a more specific number.
Here is what I'd like to know (i.e., my question clarified) :

How does this &lt; 1 degree backlash translate to pushing filament through the hot end?
Once the extruder steps are calibrated, can it cause artifacts on the prints?
Can linear advance (Marlin) or pressure advance (Klipper/Duet) make up for this &lt; 1 degree backlash of the planetary gear system?
During normal extrusion backlash has no effect.
During retraction you can perfectly compensate by increasing retraction length slightly.
Backlash cannot be taken into account for pressure advance, but unless it's a lot, it should not cause issues: pressure compensation is a second order effect and does not need to be tuned super accurately to produce results.
One degree does not seem to be enough to cause problems.