A nozzle on the Q2 wears out eventually, and swapping it is routine maintenance rather than a repair job. The printer ships with a 0.4mm bimetallic nozzle rated up to 370C, built around a ceramic throat and a heat sink module that keeps the hotend’s upper section cool while the tip runs hot. The steps below follow QIDI’s own procedure for the Q2, whether you’re replacing a worn nozzle or fitting a different diameter.
One thing worth checking before ordering a replacement: the Q2’s nozzle looks close enough to the Plus4’s to cause confusion, but the two aren’t interchangeable, since the length differs slightly despite a similar structure. Fitting the wrong one can throw off your Z offset or damage the hotend, so confirm any spare part is listed for the Q2. The same caution applies when changing diameter rather than doing a straight swap: QIDI sells 0.2mm, 0.6mm and 0.8mm nozzles alongside the stock 0.4mm, so make sure whatever you order is the Q2 version.
Start by cutting the filament at the extruder with a cutter, then heat the nozzle and extrude the remaining filament out until the path is clear. Skip this step and leftover filament ends up jamming a cooling nozzle mid-teardown.
Next, remove the silicone sock covering the nozzle. It usually slides off with little resistance, but if it’s stuck, heat the nozzle to 220C and work it free with needle-nose pliers or a cutter. QIDI’s own warning here is direct: never touch the nozzle itself with bare hands while it’s hot, since that’s how burns happen.
With the nozzle still held at 220C, use a socket wrench to loosen and remove it. Keeping it heated through removal is deliberate, since a cold nozzle threaded into a hot block is more prone to seizing or stripping. Fit the new nozzle and tighten it with the same socket wrench while still hot; the service manual lists a torque range of 1.5 to 2.0 N.m, enough to seat it firmly without straining the threads.
Once the new nozzle is tightened, turn off the nozzle heater and let it cool fully before handling it again. Only once it’s back to room temperature should the silicone sock go back on. Forcing the sock over a still-warm nozzle, or touching it before it’s cooled, is an easy way to get burned.
A worn nozzle is one of the few Q2 parts that wears out on a predictable schedule; the Q2 maintenance schedule covers the torque spec and thermal grease notes that apply here too. For general context on how nozzle condition affects a print’s first layer, see the first-layer troubleshooting guide.