Existing wiper came with Bambulab always left a PETG string dangling at the tip, wiper is not very helpful especially after tip cleaning sequence, then sometimes PETG have a short string dangling while waiting there.
So this is a DIY wiper with silicone sheet/tube to clean the tip.

The silicone tube need to be cut into a flat sheet in order to sandwich into the DIY Wiper and clamp.
You will need screw for this DIY wiper.

You need 2 screws - M3 x 6.0mm min length. (Longer is okay, it will protruded out from other side, it is okay).
Then I used ODØ6 x IDØ3mm silicone hose that use for water piping and cut into half. Then another half in order to put inside the wiper.
The slot for the cleaning the tip is only 6mm long, so any tube Ø 2.0mm onwards can be use.
Cutting orientation along the tube length or across the Ø so far okay for me, I havent notice the differences yet.