Seeder / seed roller for multiple seed sizes, fully printable (beta)

This seeder is designed to make planting in small vegetable gardens and raised beds simple, efficient, and consistent. I was inspired by larger, professional seeders like the Jango or Earthway seeders, but they are far too bulky and expensive for small-scale use. This version is compact, and fully printable. 

The seeder uses interchangeable seed holders, allowing it to handle a range of small seed sizes. From smaller cabbage species to larger coriander seeds. You can easily set planting distances of approximately 5 cm, 10 cm, or 20 cm.

Print Instructions:

All parts are designed for straightforward 3D printing, with integrated brims and supports where necessary.

• Use at least 3 perimeters for strength.
• Make sure your bed adhesion is decent, there are some parts with a small surface area on the bed.

Assembly:

Assembly Instructions

Prepare the parts

Remove the brims from the seed holders and the lid.

Clear the small support inside the seed drop hole.

Assemble the wheels

Slide the larger wheel (left on the picture) into the left side of the center piece. It should rotate smoothly; it will loosen slightly with use.

If it feels too tight, lightly sand or file down any bumps (such as print seams).

Insert the second wheel. Align the pegs so they interlock with the first wheel, making sure the seed holder holes line up correctly.

Select and install seed holders

Test your seeds with the holders to find the best fit. A seed should sit fully inside the hole without sticking out; if it does, like on the picture, move up one size.

For 5 cm spacing: install all 4 same sized seed holders.

For 10 cm spacing: install 2 seed holders opposite each other, and fill the other holes with blank pegs. (picture below, blanks are printed in black)

For 20 cm spacing: install 1 seed holder and use 3 blank pegs in the remaining holes.

Load and test

Add seeds to the hopper.

Slowly rotate the seeder forward to check that the seeds drop cleanly.

Adjust if necessary, then you’re ready to plant. 

To plant just move the seeder slowly forward, or it might skip some seeds. Make sure you keep the handle horizontal. 

Note

It has some tight tolerances and I've tested a range of seed sizes, and soil types, but not all possible options. So please let me know what works and doesn't work, feedback for improvement is very welcome.