diff --git a/lib/printerLive.js b/lib/printerLive.js
index b27fe01..645409e 100644
--- a/lib/printerLive.js
+++ b/lib/printerLive.js
@@ -34,6 +34,7 @@ function requestFullReport(c) {
 async function flushTrays(c) {
   clearTimeout(c.traysTimer);
   c.traysTimer = null;
+  c.pendingKey = null;
   const trays = allTrays(c);
   if (!c.ams && !c.external) return null;
   c.syncedKey = traysKey(trays);
@@ -60,7 +61,11 @@ function handleMessage(c, payload) {
   if (Array.isArray(units) && units.every((u) => Array.isArray(u.tray))) c.ams = describeAms(units);
   if (p.vt_tray) c.external = describeTray(p.vt_tray, null);
 
-  if ((c.ams || c.external) && traysKey(allTrays(c)) !== c.syncedKey) {
+  // A printer mid-print reports every second or so, so only a change in what's
+  // loaded restarts the wait — otherwise the sync would never come round.
+  const key = (c.ams || c.external) ? traysKey(allTrays(c)) : null;
+  if (key && key !== c.syncedKey && key !== c.pendingKey) {
+    c.pendingKey = key;
     clearTimeout(c.traysTimer);
     c.traysTimer = setTimeout(() => flushTrays(c), TRAYS_SETTLE_MS);
   }
@@ -82,6 +87,7 @@ function open(p) {
     ams: null,
     external: null,
     syncedKey: null,
+    pendingKey: null,
     lastSync: null,
     traysTimer: null,
     waiters: [],
diff --git a/public/app.js b/public/app.js
index fc35f86..bb2b26e 100644
--- a/public/app.js
+++ b/public/app.js
@@ -2747,7 +2747,10 @@ const temp = (now, target) => {
   return target ? `${t} / ${Math.round(target)} °C` : `${t} °C`;
 };
 
-function printerStatusHtml(snap) {
+// These report a placeholder chamber temperature (5 °C) rather than a reading.
+const NO_CHAMBER_SENSOR = ['A1 mini', 'A1', 'A2L', 'P1P', 'P1S'];
+
+function printerStatusHtml(snap, model) {
   if (!snap || !snap.live) {
     return '<div class="status-head"><span class="status-pill is-off">Not connected</span> <span class="form-hint">Fill in the address, serial number and access code to connect.</span></div>';
   }
@@ -2778,7 +2781,7 @@ function printerStatusHtml(snap) {
   const temps = [
     temp(s.nozzle, s.nozzleTarget) && `Nozzle ${temp(s.nozzle, s.nozzleTarget)}`,
     temp(s.bed, s.bedTarget) && `Bed ${temp(s.bed, s.bedTarget)}`,
-    s.chamber ? `Chamber ${temp(s.chamber)}` : null,
+    s.chamber > 5 && !NO_CHAMBER_SENSOR.includes(model) ? `Chamber ${temp(s.chamber)}` : null,
   ].filter(Boolean);
   if (temps.length) lines.push(`<div class="status-facts">${temps.map(escapeHtml).join(' · ')}</div>`);
 
@@ -2808,7 +2811,7 @@ async function pollPrinters() {
       const snap = live[id];
       const box = card.querySelector('.printer-status');
       if (box) {
-        const html = printerStatusHtml(snap);
+        const html = printerStatusHtml(snap, card.querySelector('select[name="model"]').value);
         if (box.dataset.html !== html) { box.innerHTML = html; box.dataset.html = html; }
       }
       // A spool swap shows as soon as the printer reports it.
diff --git a/test/printerLive.test.js b/test/printerLive.test.js
index c994ed3..6ac4a01 100644
--- a/test/printerLive.test.js
+++ b/test/printerLive.test.js
@@ -61,6 +61,28 @@ test('live status merges partial reports, and a tray change syncs spools once',
   assert.equal(c.published.at(-1).body.pushing.command, 'pushall');
 });
 
+test('a busy printer’s steady reports don’t hold back a spool sync', async (t) => {
+  t.mock.timers.enable({ apis: ['setTimeout'] });
+  t.after(() => live.stopAll());
+  clients.length = 0;
+  const synced = [];
+  live.setTraysHandler(async (id) => { synced.push(id); return {}; });
+  live.reconcile([{ ...printerRow, id: 5, serial: 'SER5' }]);
+  const c = clients[0];
+  c.connected = true;
+  c.emit('connect');
+  c.emit('message', 't', report({ ams: { ams: [{ id: '0', tray: [tray(0, 'PLA', 'FF0000FF')] }] } }));
+  for (let i = 0; i < 10; i += 1) {
+    t.mock.timers.tick(1000);
+    c.emit('message', 't', report({ mc_percent: i }));
+  }
+  assert.equal(synced.length, 1, 'synced once, five seconds after the change');
+  // The same trays again change nothing.
+  c.emit('message', 't', report({ ams: { ams: [{ id: '0', tray: [tray(0, 'PLA', 'FF0000FF')] }] } }));
+  t.mock.timers.tick(6000);
+  assert.equal(synced.length, 1);
+});
+
 test('changing a printer’s code reopens its connection; removing it closes it', () => {
   clients.length = 0;
   live.reconcile([printerRow]);