These are Seed Starter depth gauges to aid in planting seeds in seed starter pods.  There are a few versions included with different print profiles, depending on your needs or desires:

• Imperial (inches): graduated depth to 4 inches deep, marked per half-inch
• Metric (cm/mm): graduated depth to 80mm, marked per 5mm (cm)

Each version has print profiles for PETG and PLA, and each one of those has a single-color or multi-color profile.  The extra color is applied to the raised graduations and numbering/lettering for higher visibility when placed into a planter.

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
• Single and double-wide trays that fit small, large, and largest seed starter units can be found here: Watering Trays
• Giant double-double wide tray that fits small, large, and largest seed starter units can be found here: Double-Double Watering Tray
• 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