UPDATE 11.12.2025

Updated TPU “spring” added to design.

I printed it from Extrudr Flex Semisoft Tpu, 85A Hardness. Works like a dream. 0.28 layer height, 15% gyroid infill.

I have had several O-rings snap using this mod for a while, and I think TPU spring solved the issue for me. 

My take on mod Moza's HGP H-pattern shifter to be used as sequential shifter.

I wanted to make it as simple as it can be, but look decent and feel solid. Stays securely on its place using magnets.

Only few non-printed parts are needed, listed below. Should be easy enough to source.

I used superglue to attach extension nuts to top part and magnets to bottom.

Hardware needed:

- 4 x 10mm x 2mm neodymium magnets
- 2 x M6 extension nut, 25mm length
- 2 x M6 x 20 bolt
- 2 x M6 washers (optional, not necessary)

-1 x printed TPU spring

If you go for original model without using TPU spring:
- 3 x 3,5mm x 30mm (or similar) rubber O-rings
- Some foam for added dust-proof and dampening (optional but recommended)

No post-processing needed, all parts can be printed without any supports.

I used PLA for bottom and top and PET-G for knob, but I think any filament will work.

Knob prints with m12x1.5 thread and for my shifter has a really tight fit.

Have a nice time simracing!