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docs: TEC ships on Pro per published specs, not verified per unit

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Basic/Plus share the passive closed-loop cooling and the 60-75 F
window per Glowforge's tech specs and owners-forum consensus; the
Pro's solid-state TEC buys 60-81 F. Spec-level only - tec_present
stays a user setting regardless, since tec_on has no readback.
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ScottW514
2026-08-08 12:18:11 -04:00
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@@ -785,12 +785,16 @@ chooses otherwise).
reach the gate; that is honest, not a bug). reach the gate; that is honest, not a bug).
- **TEC handling: PLANNED (laser-milestone scope, - **TEC handling: PLANNED (laser-milestone scope,
operator-directed 2026-08-08).** The control board is common to operator-directed 2026-08-08).** The control board is common to
Basic/Plus/Pro but the TEC itself is populated on Pro only, and Basic/Plus/Pro; per Glowforge's published specs the TEC ships on
`thermal/tec_on` is a bare on/off output with NO readback — the Pro (Basic/Plus: same passive closed-loop cooling, 60-75 °F
presence cannot be detected, so it is a user setting: operating window; Pro: "solid-state thermoelectric cooler",
60-81 °F — owners-forum consensus matches), but that is a
spec-level claim, not teardown-verified per unit, and
rebuilt/revision units may vary. Moot for the design either
way: `thermal/tec_on` is a bare on/off output with NO readback —
presence cannot be detected — so it is a user setting:
`tec_present` (Machine tab, default off; ForgeFIRM never drives `tec_present` (Machine tab, default off; ForgeFIRM never drives
tec_on unless set — on the bench Basic/Plus the line lands on an tec_on unless set). The setting also covers retrofits. Operation when present: the factory
unpopulated position). Operation when present: the factory
regulates coolant toward its ~18 °C setpoints (CMet/CMdt regulates coolant toward its ~18 °C setpoints (CMet/CMdt
18134/18364 mdeg — the same WTub/WTvb raw-754/751 pair that 18134/18364 mdeg — the same WTub/WTvb raw-754/751 pair that
proved the thermistor curve); plan is a simple hysteresis while proved the thermistor curve); plan is a simple hysteresis while