Ring roller. By Rainfall Projects. 9:41 video:
https://www.youtube.com/watch?v=bdzmADmsMKA
Previously:
https://www.homemadetools.net/forum/...055#post140976
https://www.homemadetools.net/forum/...321#post165810
https://www.homemadetools.net/forum/...349#post146393
https://www.homemadetools.net/forum/...2773#post97101