Fine tune your first layer and calibrate your flow rate in 6 minutes. 

This model uses only 0.7 grams / 22cm of filament. Print in vase mode.

Measure all 4 walls with calipers. 

Standard wall thickness in PrusaSlicer with 0.4mm nozzle is supposed to be 0.45mm.

(0.45 / Average wall thickness measured) * current flow rate = new flow rate.

Example:

Current flow rate in filament profile: 1.00

Measured values of walls: 0.43 / 0.44 / 0.46 / 0.44 → average: 0.4425

0.45 / 0.4425 = 1.017

1.017 * current flow rate = new flow rate = 1.017 → set in filament profile and save.