Before (so put the tape on then level) seems sensible to me though I've never used tape. But you want to level against the surface you are going to print on.
Unless that surface is very flat, like glass. Some people swap pieces of glass from one print to the next to save time. As long as each piece is the same thickness it works.
Edited 1 time(s). Last edit at 09/21/2016 04:38PM by DjDemonD.
Simon Khoury
Co-founder of [www.precisionpiezo.co.uk] Accurate, repeatable, versatile Z-Probes
Published:Inventions