Links are provided below as a condensed listing of various files and objects for download as mentioned in my blog : –
Additional Femi_files and notes
Laser alignment module for the Femi NG120ABS
Modifications to the Devon Sea Clock Notes May 2021
Flatcam and milling pcbs 2021 update based on Flatcam version 8.9x
Thwaites Clock Activity write up.
An idea for a 4 Jaw Chuck Laser Centring Device write up as pdf
Arc and Circle Calculation Sheet for GCode spreadsheet for calculating I and J codes.
How to use FlatCAM based on Version 8.5 (see 2021 update for 8.9x version)