I've added the assembly video on my youtube channel, and you can find too my account tiktok on bio.
All is printable parts.
The issue for ramrod to short is probably a not perfect calibration, in a XYZ cube if you have 19.90 so in my 200mm height barrel you will loose 2mm. So i maded a barrel printable flat to have the same mystake calibration as ramrod for they can match together.