Self-watering Seed Starter Trays for 127mm units

UPDATE 2/9/2025: added 4mm additional length to the double-wide tray with handles (no-handles version not affected).  When screws are added for handle attachment, small seed starters fit tight enough that lids don't fit properly.  Large seed starters are not affected.

This is a set of single and double self-watering seed starter trays for 127mm seed starters.  It can fit any standard 127mm starter unit.  It has raised slats on the bed to allow water to flow out of the bottom of your starter pods, and optional handles to move the trays around easily.

The single tray with handles does print with supports, but it's very minimal with the tree supports.  They do not need any support medium material with the print settings in the profiles, and will break away easily and cleanly both in the PETG and PLA profiles.

This setup is part of a larger series of designs I made for your plant starting adventure.

• Small self-watering starters to begin your initial starts can be found here: Small Starter Units
• V2 Larger self-watering starters (stackable!) to transfer your small starts can be found here: Large Stacking Starter Units
• V1 Larger self-watering starters (non-stacking) to transfer your small starts can be found here: Large Starter Units
• Large single pot to finish your mature starts before moving to beds can be found here: Large Single Units
• Giant double-double wide tray that fits small, large, and largest seed starter units can be found here: Double-Double Watering Tray
• Tools for seed depth setting in both Imperial and Metric units can be found here: Seed Depth Gauges
• Tools for spacing planting locations across garden beds can be found here: Seed Spacer Planting Tool
• Self-watering Lids that fit on both the small and large starters can be found here: Self-Watering Lids

I've included both PETG and PLA profiles, depending on how one would like to build these.  I would recommend PETG though since it will resist breaking down from the moisture, and it will resist heat much more if an incubation pad is used.

The double-wide tray can be printed with or without handles.  If you choose to print with handles, the handles will print separately (due to build volume limitations).  It also cannot be printed on the A1 mini due to its size of 250mm.  The double-wide handles are designed to be attached using threaded heat inserts.  You will need 3 x M3x4mm inserts for each handle, and 3 x M3x6mm screws to attach them (total of 6 each per double-wide tray).

As I try to do with all of my models, I've included both STEP and STL files for all models in the projects.  Feel free to adjust as necessary for your own needs.  If you need/prefer the CAD model itself, DM me and I'll try to send you a link to my OnShape project for the model.

Thanks, and happy printing!