Check out my 2009 instructional Flash game on making kaleidocycles here!
https://htwins.net/dode/
https://htwins.net/dode/dodecahedron.swf
this video is not sponsored, but if you want to get a karmagami kaleidocycle, you can go here! (i think) https://funinmotiontoys.com/products/karmagami
ViHart's 2012 video on Hexaflexagons: https://www.youtube.com/watch?v=VIVIegSt81k
