I consider this shifter design an upgrade over my previous design. I included a render of this new shifter next to my previous design so you can see the size difference. My previous design is available here: https://www.thingiverse.com/thing:4193571

This new version uses space more efficiently and has a very compact base that measures only 23mm x 19mm. Also, this new version uses a clevis pin as a hinge, which is an upgrade over the dual screw method used on my previous design. This version uses a more compact switch that can be press fit into the holes on the side of the base.

This new design does retain the 10mm diameter mounting pattern for m3 screws on the bottom of the base and on the end of the shaft and uses the same size magnets.

Printing the base does require supports touching build-plate and I would recommend printing in PLA. I had trouble removing the supports using PETG and when I was able to remove supports, the pocket holding the magnet would be ripped out too.

Like with my previous design, I have included a .step file so you can modify this design to fit your needs.

Parts per pair:

2x Omron Switch
https://www.digikey.com/product-detail/en/omron-electronics-inc-emc-div/D2HW-BR213MR/SW728-ND/404511

4x 7/16 x 3/16 Inch Magnets
https://www.kjmagnetics.com/proddetail.asp?prod=D73-N52

2x Clevis Pin
https://www.mcmaster.com/92735a130

M3 screws and nuts to mount the paddles and to mount the shifters to the wheel.