Logitech G403 G603 G703 mouse wheel scroll repair

Some Logitech mice are known to develop scroll wheel issues over time. The pin/rod that rotates the scrolling mechanism inside gets worn out after a while and starts skipping. I used to buy replacement wheels online but they also tend to wear out eventually.

After having multiple replacements fail, I started Googling 3d printable replacement wheels and tried a few. Most of them worked but they didn't look or feel like the original one in my hand.

In the end I came up with a simple solution to reuse the original scroll wheel by just replacing its problematic "pin" part. I'm very happy with the results, see the pictures for details and instructions.

I got the best results when printing with the smallest layer height possible and making the first layer height same as the other layers.

I've designed these 2.5 years ago, put them in two mice and have been using them ever since. The fix lasted 1.5 years on the first mouse and 2 years on the second one. When they failed it took me 5 minutes to open them, replace their pin and get them working again.