This is a parametric seeder wheel, with default parameters for a Jang seeder. You can adjust things like the diameter and borehole to adjust for your printer's tolerances. You can also adjust the number of seed cells and their size.
If you want to make an enhancement to this Thing, please fork the source project and submit a pull request; comments in Thingiverse aren't really great for communicating code edits.
Jang.Seed.Rollers.zip contains all the rendered STL files.
If you want a custom roller, I strongly recommend downloading seed_roller.scad and seed_roller.json, and opening the scad in OpenSCAD - the native customizer is far more robust than the one on Thingiverse.
Jang.Seed.Rollers.zip | 11.0MB | |
Jang_Z-Blank.stl | 170.6KB | |
seed_roller.json | 39.5KB | |
seed_roller.scad | 15.8KB |