DWC hydroponic 50 mm Net Pot
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Hydroponic net cup with oval side slots — no supports, no bridging sag, walls sized to exactly 4 perimeters. Parametric
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Model information
- Source
- Printables
- Category
- Outdoor & Garden
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
50 mm Net Pot / Net Cup — redesigned for FDM (no supports)
A hydroponic net pot (net cup) that actually prints clean on a normal FDM
printer. Most net pots on Thingiverse are injection-moulding geometry exported
to STL: rectangular side slots with long flat unsupported top edges. On an FDM
machine that first layer over a slot is a 9–10 mm bridge, and it sags, strings,
and leaves a rough lip you have to clean off twelve times per pot.
This one keeps the same open area and the same drainage, but every opening is
shaped so the printer only ever has to bridge a fraction of a millimetre at a
time. No supports, no brim, no cleanup.
Specs
Body diameter | 50 mm |
Rim (outer) diameter | 54 mm |
Height | 55 mm |
Wall thickness | 1.6 mm (exactly 4 perimeters at a 0.4 mm nozzle) |
Taper | 12° |
Side openings | 12 columns × 2 rows |
Bottom | multi-hole drainage pattern, ~34 mm flat |
Longest unsupported bridge | 0.21 mm |
Drops into a 50 mm hole in a bucket lid, tote lid, or gutter; the 2 mm brim
rests on top.
Why the slots are oval
The original rectangular slot has a flat top edge — one long unsupported span
the full width of the opening. Closing the ends of the slot smoothly turns that
single long bridge into a stack of sub-millimetre ones, each printed onto the
layer below it.
Slot shape | Open area vs. rectangle | First 0.2 mm layer spans |
|---|---|---|
rectangle (original) | 100 % | 9.60 mm |
oval (this STL) | 64 % | 0.21 mm |
arch | 82 % | 0.41 mm |
teardrop | 57 % | 0.13 mm |
The included STL uses oval. The .scad also has arch, which keeps straight
sides and only rounds the ends — it buys back most of the open area the ellipse
gives up while bridging just as well. Change hole_shape and re-export if you
want more root exposure.
Print settings
Supports: none
Brim/raft: none needed, the flat bottom is ~34 mm across
Layer height: 0.2 mm
Nozzle: 0.4 mm (walls are sized for exactly 4 perimeters — set perimeters
to 4 and the walls come out solid with no gap fill)Infill: irrelevant, the part is all perimeter
Orientation: as exported, brim up, flat bottom on the plate
Material: PETG or ASA if it lives in a nutrient reservoir. PLA works
indoors but slowly hydrolyses in constant standing water.Colour: use something opaque. Translucent filament lets light reach the
root zone and you will grow algae.
Customising
The .scad is fully parametric — every dimension is a named variable at the
top of the file:
diameter = 50; // body diameter, mm
height = 55;
brim = 2; // rim overhang
vase_angle = 12; // taper, degrees
thickness = 1.6; // 4 * nozzle
side_holes = 12; // number of slot columns
hole_shape = "oval"; // "oval" | "arch" | "teardrop"
Open it in OpenSCAD, change what you need, F6, export. For a 3" pot setdiameter = 75 and bump side_holes to 16 or so to keep the ribs the same
width.