DrainMaster XL — Large Drain Catch Tray (220×220×76 mm)

What is the DrainMaster XL?

The DrainMaster XL is a self-watering/drain management system for large plant pots — popular in indoor growing setups. You can find the original product here:

👉 DrainMaster XL Einzelset — https://drain-master.de/produkt/drainmaster-xl-einzelset

Take a look at the product photos. You can see the stock catch tray that ships with it. Tiny. That's the problem.

The Problem

The DrainMaster XL is great, but its stock catch tray is absurdly undersized — it holds roughly 1 litre at best. Anyone who waters large pots properly knows that healthy flushing produces 10–30% runoff. Water in 10 litres, collect 2–4 litres of drain. The original tray overflows almost immediately, which means wet floors, wasted nutrient solution, and no way to accurately measure what's coming out.

It's baffling that such a large system ships with such a small tray. This model fixes that.

What This Tray Does

- Holds real drain volumes — 220 × 220 × 80 mm outer footprint, sized to sit directly under the DrainMaster XL pot platform without modification

- Pull-out grip posts — four square posts (one centred on each inner wall, full height) give your fingers something solid to grab. No fumbling around the rim

- Reinforced floor-wall junction — a 5 mm chamfered transition replaces the sharp 90° inner corner. This is the classic failure point on printed trays; the chamfer spreads stress across the junction and makes it far less likely to crack or delaminate under load

- Thick floor — 4 mm bottom (20 layers at 0.2 mm) handles the weight of a full drain without flexing

- Drain EC measurement — pull the tray out, dip your EC/pH meter in directly. No need to pour or transfer

Dimensions

- Outer width × length: 220 × 220 mm

- Height: 80 mm

- Wall thickness: 2.0 mm

- Floor thickness: 4.0 mm

- Corner radius (outer): 12 mm

- Inner chamfer: 5 mm (45°)

- Grip post size: 8 × 8 mm

- Usable volume: ~3.5 litres

Print Settings

- Printer: Bambu Lab P1P (256 × 256 × 256 mm build volume — fits with room to spare)

- Layer height: 0.2 mm

- Line width: 0.4 mm (standard nozzle)

- Wall lines: 5 minimum (already encoded in model)

- Top/bottom layers: 5–6 layers

- Infill: 20–30% (gyroid or grid)

- Supports: None required

- Brim: Recommended (wide flat base)

- Material: PETG strongly recommended — water resistance, flexibility under load, no warping issues. PLA works short-term but will degrade with moisture and nutrients over time. ASA/ABS also fine if you have an enclosure

- Print time (estimated): ~6–10 h depending on printer speed

Notes

- The wall thickness and floor thickness are hardcoded into the geometry, not just slicer settings. You do not need to set extra wall lines in your slicer — the model is already solid enough. Just print normally.

- The inner chamfer is a true geometric feature, not just a visual detail. It prints without supports because the 45° angle is self-supporting.

- The OpenSCAD source file is included. All parameters (dimensions, wall thickness, post size, chamfer) are clearly labelled at the top of the file — easy to customise for different pot systems or tray sizes.

Compatibility

Designed and tested for the DrainMaster XL. May fit other large pot/planter systems with a similar footprint — check your dimensions against the outer 220 × 220 mm footprint before printing.