project
Ghost Hand
Public Unreviewedby John Lauer
A small battery gadget that keeps an automatic sink faucet running while you use the sink: it learns the faucet's timeout, re-arms with the shortest blip, and stops after 10 minutes or when picked up.
main
Mechanical pricing basis, 2026-11-08
Prices are USD planning estimates, excluding tax, shipping, print time and labour. No purchases were made. The manufacturing release needs a final received-hardware check.
- Prusament PETG Jet Black 1 kg, budget USD 29.99/kg. A cached supplier listing showed USD 25.49; the conservative budget avoids relying on a sale or regional checkout. Sage colour matching may cost more.
- Prusament TPU 95A Natural 500 g, USD 34.99/500 g standard-price planning basis. Use polyether TPU for wet service. The foot uses the same material price; optional softer TPU is not separately quoted.
- Clear SLA resin budget USD 50/kg. This is an estimate, not a quote; choose only after optical transmission and adhesive coupons pass. UV cure, polish and wash consumables are excluded.
- PSM MINI-TECH MTEC-B-M1.6, preferred 2.5 mm length, OD 2.50 mm, pilot 2.10 mm, recommended hole 2.15 mm, minimum radial wall 0.8 mm: manufacturer dimension sheet. Budget USD 0.15 each, RFQ required. Comparable CNC Kitchen M1.6 x 2.5, 100 pieces is listed at USD 11.50/100. Its own 2.2 mm pilot and larger minimum wall differ, so it is a price comparator, not an approved drop-in substitute. The case's high insert position leaves the board relief below the insert.
- Four Vital Parts TPH14583-M16-14-A2, M1.6 x 14, 0.35 pitch A2 stainless ISO 14583, T5 drive: GBP 0.13 each ex VAT at 1-99, GBP 0.12 at 100-999. Head diameter 3.2 mm, height 1.42 mm. USD 0.20 each is a conservative planning allowance including currency variation, not a live USD quote. CAD uses that 1.42 mm head. Its bottom is 0.17 mm below the rigid base and still 0.33 mm above the counter plane established by the foot; the upper sealing washer sits at Z=1.25..1.55. Counterbores are 3.5 mm diameter. No substituted larger socket head without a fit recheck.
- Adhesives, exterior seal coating and compatible port grease: USD 0.25 per unit budget only. Products remain coupon-qualified process selections.
Printed mass uses the exact CAD solid volume and material density, plus 15% process allowance for cost. TPU gasket and screw-washer print dimensions use their free heights, not compressed assembly heights. CAD mass uses closed geometry; assembly mass includes complete battery 4.65 g and estimated populated board 2.4 g. The BOM excludes PCB/electronics and battery price so the studio can add it without double-counting.
# Mechanical pricing basis, 2026-11-08
Prices are USD planning estimates, excluding tax, shipping, print time and labour. No purchases were made. The manufacturing release needs a final received-hardware check.
- [Prusament PETG Jet Black 1 kg](https://www.prusa3d.com/product/prusament-petg-jet-black-1kg-nfc/), budget USD 29.99/kg. A cached supplier listing showed USD 25.49; the conservative budget avoids relying on a sale or regional checkout. Sage colour matching may cost more.
- [Prusament TPU 95A Natural 500 g](https://www.prusa3d.com/product/prusament-tpu-95a-natural-500g-nfc/), USD 34.99/500 g standard-price planning basis. Use polyether TPU for wet service. The foot uses the same material price; optional softer TPU is not separately quoted.
- Clear SLA resin budget USD 50/kg. This is an estimate, not a quote; choose only after optical transmission and adhesive coupons pass. UV cure, polish and wash consumables are excluded.
- PSM MINI-TECH MTEC-B-M1.6, preferred 2.5 mm length, OD 2.50 mm, pilot 2.10 mm, recommended hole 2.15 mm, minimum radial wall 0.8 mm: [manufacturer dimension sheet](https://www.bulten.com/media/1nylm4pj/mini-tech-cleaned.pdf). Budget USD 0.15 each, RFQ required. Comparable [CNC Kitchen M1.6 x 2.5, 100 pieces](https://cnckitchenus.store/products/heat-set-insert-m1-6-100-pieces-kopie) is listed at USD 11.50/100. Its own 2.2 mm pilot and larger minimum wall differ, so it is a price comparator, not an approved drop-in substitute. The case's high insert position leaves the board relief below the insert.
- Four [Vital Parts TPH14583-M16-14-A2](https://www.vital-parts.co.uk/torx-pan-head-machine-screws/44938-tph14583-m16-14-a2), M1.6 x 14, 0.35 pitch A2 stainless ISO 14583, T5 drive: GBP 0.13 each ex VAT at 1-99, GBP 0.12 at 100-999. Head diameter 3.2 mm, height 1.42 mm. USD 0.20 each is a conservative planning allowance including currency variation, not a live USD quote. CAD uses that 1.42 mm head. Its bottom is 0.17 mm below the rigid base and still 0.33 mm above the counter plane established by the foot; the upper sealing washer sits at Z=1.25..1.55. Counterbores are 3.5 mm diameter. No substituted larger socket head without a fit recheck.
- Adhesives, exterior seal coating and compatible port grease: USD 0.25 per unit budget only. Products remain coupon-qualified process selections.
Printed mass uses the exact CAD solid volume and material density, plus 15% process allowance for cost. TPU gasket and screw-washer print dimensions use their free heights, not compressed assembly heights. CAD mass uses closed geometry; assembly mass includes complete battery 4.65 g and estimated populated board 2.4 g. The BOM excludes PCB/electronics and battery price so the studio can add it without double-counting.