Replacement walker foot for the Chinese/China Leather Shoe Patcher (CLSP), 3d printed.
My own design, with rounded teeth on the feet to ensure no marking of even soft pull-up leathers.
Angled to allow stitching close to the edge with a guard - can go down to less than 2mm from the edge.

Update: Now printed in ABS+ with 75% infill, this makes the part much more rigid than previous parts in PLA. I've tried my hardest to break one without success!

Photos show the version fitted to my machine, after 6 months heavy use.
Ships with 2x M5x10mm bolts to affix this to the machine, replacing the awful screws that come with the machine.

You will most likely need to use this with a table - either a wood table around the armature (the sticky-outy bit where the needle goes into) or a metal table directly mounted on the top plate.
This allows much more surface area from the foot to contact the leather and provides a stable base to press against.
The foot isn't suitable for using to stitch boots on the armature alone.