Best answer: You can print on smaller paper sizes up to 8 1/2" x 11" or envelopes.
HP says: "A4, A5, A6, B5 (JIS), B6 (JIS), 16K (195 x 270 mm, 184 x 260 mm, 197 x 273 mm), 10 x 15 cm, Oficio (216 x 340 mm), postcards (JIS single, JIS double), envelopes (DL, C5, B5)"
The heaviest paper that works reliably is 8 pt. C1S. You may be able to print a single 10 pt. sheet but that will be more hit-or-miss as the stiffer weights don't easily make the bend to the output tray.
HP says: "Tray 1: 60 to 176 g/m² (up to 200 g/m² with postcards and HP Color laser glossy photo papers); Tray 2: 60 to 163 g/m² (up to 176 g/m² with postcards, up to 200 g/m² HP Color laser glossy photo papers)"
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