# SP-01 — Printing

All 7 parts fit a Bambu P1S (256 × 256 × 256) with no splitting. Times are for
a P1S in PETG at 0.2 mm.

## Material

**PETG throughout.** Not PLA:

- the reservoir and pot hold water continuously, and PLA creeps and is prone to
  hydrolysis over months;
- a desk unit sitting in a sunny window gets warm, and PLA softens at ~55 °C;
- PETG's layer adhesion is what keeps the reservoir from weeping at the seams.

ASA or ABS are fine substitutes. Avoid PLA for the reservoir, the pot and the
saucer specifically — the strap, cap and lid would survive it.

## Per part

| Part | Orient | Layer | Walls | Infill | Support | ~Time | ~Mass |
|---|---|---|---|---|---|---|---|
| `pot_body` | As modelled, base down | 0.2 | 4 | 15 % | **None** | ~14 h | 363 g |
| `saucer` | As modelled, base down | 0.2 | 4 | 15 % | None | ~4 h | 88 g |
| `enclosure_base` | As modelled, base down | 0.2 | 4 | 20 % | None | ~8 h | 178 g |
| `enclosure_lid` | Flat, outer face down | 0.2 | 4 | 20 % | None | ~2 h | 37 g |
| `reservoir_tank` | As modelled, base down | 0.2 | **6** | 20 % | None | ~4 h | 72 g |
| `pump_strap` | Flat | 0.2 | 4 | 40 % | None | ~5 min | 4 g |
| `fill_cap` | Flange down | 0.2 | 4 | 20 % | None | ~15 min | 5 g |

**No part needs support.** Every overhang is either a 45° self-supporting
chamfer (the two pot spines, the delivery boss) or a short bridge. If your
slicer proposes support, check you have not rotated something.

### The reservoir needs 6 walls

`reservoir_tank` is the one part where the default profile is not enough. Print
it with **6 perimeters and 6 top/bottom layers**. FDM prints hold water only if
the wall is thick enough that no single weak layer line goes all the way
through. If you want certainty, brush the inside with food-safe epoxy or drop in
a 1 L liner bag — but at 6 walls in PETG it holds.

Do a leak test with plain water for an hour, on a towel, before you put it in
the enclosure. That is much cheaper than finding out later.

### The pot and saucer

`pot_body` is the long print. It is a plain vertical extrusion apart from the
two spines, so it is undemanding — just long. The two spines print as vertical
walls with a 45° foot; do not rotate the part.

The saucer's three internal ribs are what the pot stands on, so water can drain
out from underneath. Do not "clean them up" — they are structural to the
drainage.

## After printing

1. **Test-fit the reservoir in the wet bay before assembling anything.** It has
   2 mm clearance per side; a bit of elephant's foot on the first layer is the
   usual reason it will not drop in. Scrape the bottom edge if needed.
2. Run a 2.5 mm drill by hand through the four Feather standoff pilots and the
   two driver pilots if your printer runs tight — the M2 screws should bite, not
   split the boss.
3. Check the horizontal delivery bore through the pot wall is clear. It is a
   6.4 mm horizontal hole; a light ream with a 6 mm drill by hand cleans up any
   droop on the top of the bore.
4. Deburr the USB-C opening so the plug enters squarely.

## Identity

Every part carries `BYITL SP-01 revA g0.29.4 2026-07-22` debossed 0.4 mm deep on
a hidden face (undersides, and the strap's top face). It will not show in
normal use. If it does not appear in your slicer preview, your first layer is
probably being squashed — worth fixing anyway.
