The short answerPETG for waterproof indoor. ASA for outdoor sun.
A planter holds wet soil and may live outside. PETG is the pick for a waterproof indoor pot. ASA is the pick for a pot that sees sun. PLA works for a dry decorative pot, but it warps in water and sun.
What a planter asks of a filament
A planter holds moisture, so it must not leak or degrade. It also faces sun if it lives outside. PLA softens and breaks down in water and UV, so it suits only dry, indoor, decorative pots.
How the materials compare
| Property | PETG | PLA | ASA |
|---|---|---|---|
| Watertight | Yes | Poorly | Yes |
| UV resistance | Low | Low | High |
| Moisture tolerance | High | Low | High |
| Ease of print | Medium | Easy | Hard |
| Best for | Indoor pots | Dry decor | Outdoor pots |
When to pick PETG
Pick PETG for a waterproof indoor planter. It prints watertight at 240 to 260 °C and tolerates moisture. Add a few extra perimeters so the walls hold water without seeping.
When to pick ASA
Pick ASA for a planter that lives in the sun. The Prusament ASA datasheet lists UV resistance and a heat deflection of 93 °C. ASA holds up where PETG yellows and PLA fails.
Frequently asked
What is the best filament for planters?
Can I use PLA for a planter?
How do I print a watertight planter?
Which planter filament handles the sun?
For outdoor use, read which filament for outdoor use. For the materials, see the PETG guide or ASA guide.
Related guides
Related
Sources & methodology
4 citations · reviewed 2026-07-09- 01Prusament PETG Technical Datasheetaccessed 2026-07-06Tier 1
- 02Prusament PLA Technical Datasheetaccessed 2026-06-29Tier 1
- 03Prusament ASA Technical Datasheetaccessed 2026-07-09Tier 1
- 04All3DP All 3D Printing Filament Types Explainedaccessed 2026-06-29Tier 2