3D-print files for PPG 3D-print files for ECG-PPG finger sensor clip in DesignSpark Mechanical format. Also STL files.
The complete Instructable is at:
https://www.instructables.com/ECG-With-PPG-Using-Arduino/
I've included preliminary copies of the Instructable (as PDF) and the Arduino files here but they are not going to be updated. For the latest versions, see the Instructable.
If you have queries, please ask them on the Instructable web page. I will not monitor Github for comments.