SummaryI developed an application that performs some calculations regarding the setup of 3D printers. It is available for free (also no advertisements) on the Google Play Store for all Android devices (sorry no iOS). https://play.google.com/store/apps/details?id=appinventor.ai_carlfranc.taq3DPRINTCALC_V1a&hl=it (this is the italian link, if is not accessible from you make a search with the app name) I took inspiration on calculators already available on various HTML pages that are mentioned in the About page of the application. (Prusa calculator etc ...) It starts from a menu of six buttons that allow you to access the various submenus with calculations relating to: Filament Belt drives leadscrews drives extruder setup optimal layer height I checked in every possible way the calculations and it seems that the results returned are correct. If not please report to me and I try to fix as quickly as possible.