My bike starts to crunch with sand once a year. This means that the bottom bracket is full of dirt, so I have to remove the cranks, unscrew the bottom bracket, clean everything... And I got tired of it, so I made these covers... I printed it out of PETG, but it should be better out of TPU, but I don't have it. The left cover is held on with a rubber ring from an old bicycle tube.

P.S. make it for Crosser jazz 29