This is a replacement front wheel for the Roborock S7 Series.

The original front wheel is made out of hard plastic and really noisy when the robot is driving on tiled floor with rather big grout lines. As this wheel is printed in TPU and hollow, it dampens the robots up and down movement, when crossing the tile floor.

You'll need two 8x4x3mm bearings and the shaft from the original front wheel, or if you have a 4mm diameter metal rod, cut it to 29mm length.

I printed it with Colorfabb Varioshore TPU set to 55% foaming, to give it a rather rough outer surface.