The Sigma Over-Clamp Butler mount: https://sigmasport.com/product/over-clamp-butler-gps/ comes with rubber spacers only for 31.8 and 35 mm handlebars, so I've made one for my 22.2 mm handlebar.
The inner circle is placed eccentric to be able to adjust the height of the mount.
The fit for the 22.2 mm is quite tight on purpose, but as you can see on the pictures it fits nicely.
I've printed it from Fiberlogy MattFlex 40D with a Prusa MK4 and textured sheet, using the appropriate filament profile in PrusaSlicer and 0.20 quality profile.
I've also added a brim, because my first print warped a bit during printing.
The author marked this model as their own original creation.