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docs: reconcile BOM + Build Guide with v1.2.1 hardware #41

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daniel-frenkel merged 1 commit into from
Jul 30, 2026
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docs: reconcile BOM + Build Guide with v1.2.1 hardware #41

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8 changes: 5 additions & 3 deletions docs/BOM-V2.0.md
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# BOM V2.0

> Reflects the **v1.1** hardware. What changed from v1.0: a smaller-diameter **MK8** drive gear (pull strength 11 lb → 15 lb), **one larger 633ZZ bearing per arm** instead of two small bearings, and **pre-cut PTFE tubes** (no razor-cutting). Quantities are per unit. Every purchasable part links to the [Valar Systems store](https://valarsystems.com).
> Reflects the current **v1.2.1** hardware. Notable changes since v1.0: a smaller-diameter **MK8** drive gear (pull strength 11 lb → 15 lb), **one larger 633ZZ bearing per arm** instead of two small bearings, **pre-cut PTFE tubes** (no razor-cutting), **foam mounting squares** in place of adhesive command strips, and a **24 V 1.5 A** power adapter. Quantities are per unit. Every purchasable part links to the [Valar Systems store](https://valarsystems.com).

## Body Assembly

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| PTFE tubing, 3 mm ID × 5 mm OD (pre-cut) | 6 | 2 × 10 mm, 2 × 40 mm, 2 × 70 mm — [buy](https://valarsystems.com/products/ptfe-tube). |
| M3 × 10 mm screw, self-tapping | 14 | [Thread-forming screw](https://valarsystems.com/products/m3-x-10mm-thread-forming-screw). |
| M3 square nut | 1 | [Curtain-pulley nut](https://valarsystems.com/products/m3-square-nut). |
| Zip tie | 1 | Small, 2–3 mm wide — [buy](https://valarsystems.com/products/zip-tie). |
| Zip tie | 4 | Small, 2–3 mm wide. One for the motor-side rope elbow, one for the far-side pulley, and two for attaching carriages to ring curtains (one per carriage) — [buy](https://valarsystems.com/products/zip-tie). |
| V623ZZ pulley | 1 | 3 × 12 × 4 mm — [V-groove pulley](https://valarsystems.com/products/v-groove-pulley). |
| Rope | 1 | 1.6 mm diameter — [buy](https://valarsystems.com/products/rope). |

> **Carriages:** the standard build uses **two** carriages (one with a single top screw, one with two). How many carriages a multi-panel curtain needs is not documented yet — **TODO**.

### Mounting Hardware

| Part | Qty | Description |
| :--- | :---: | :--- |
| Foam mounting squares (set of 5) | 5 | 1" square double-sided foam. Wipe the surface clean and dry, then press firmly — [buy](https://valarsystems.com/products/foam-mounting-squares). |
| Foam mounting square, 1" | 5 | Double-sided; **five squares per unit**. Wipe the surface clean and dry, then press firmly — [buy](https://valarsystems.com/products/foam-mounting-squares). |

## Assembly Tools Required

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8 changes: 5 additions & 3 deletions docs/wiki-Build-Guide.md
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Assembling a Ropener takes about **20 minutes** with three common hand tools — no soldering. It comes together in three stages: the **motor body**, the **curtain-rail carriages**, and **attaching it to your curtains**. Follow whichever guide below suits you — they all cover the same build.

> 🆕 **New in v1.1** — This guide covers the current **v1.1** hardware:
> 🆕 **Current hardware — v1.2.1.** Notable changes since v1.0:
> - **Stronger pull (11 lb → 15 lb)** from a smaller-diameter **MK8** drive gear (replaces the MK7).
> - **One larger 633ZZ bearing (3 × 13 × 5 mm) per arm** instead of two small bearings.
> - **Pre-cut PTFE tubes** (10 / 40 / 70 mm) — no measuring or razor-cutting.
>
> Print from [`hardware/plastics/v1.1`](https://github.com/Valar-Systems/Ropener/tree/main/hardware/plastics/v1.1). The v1.0 files remain in the repo for anyone who already built one.
> Print from [`hardware/plastics/v1.2.1`](https://github.com/Valar-Systems/Ropener/tree/main/hardware/plastics/v1.2.1). Earlier revisions remain in the repo for anyone who already built one.

## How to build

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| NEMA 17 stepper motor | 1 |
| 24 V 1.5 A power adapter | 1 |
| Cable extension | as needed |
| Foam mounting squares (set of 5) | 5 |
| Foam mounting square, 1" | 5 |
| 1.6 mm rope | 30 ft |
| PTFE tubing (pre-cut: 2 × 10 mm, 2 × 40 mm, 2 × 70 mm) | 6 |
| M3 square nut | 4 |
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> **Overview.** Along the rod, from one end to the other, you'll have: the **pulley**, a **carriage with one screw on top**, a **carriage with two screws on top**, and the **motor-side** anchor.

> **How many carriages?** The standard build uses **two** (one single-screw, one double-screw). How carriage count should scale as the number of curtain panels grows is not documented yet — **TODO**.

<!-- 📷 media/build-guide/15-setup-overview.png — rail layout: pulley, 1-screw carriage, 2-screw carriage, motor side -->

The **PTFE tubes come pre-cut** — no cutting needed. You'll have **two of each length**:
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