When the HotEnd is at tempereature, tighten the nozzle whilst holding the heater block with a spanner.
This will tighten the nozzle against the HeatBreak and ensure that your HotEnd does not leak.
You want to aim for 3Nm of torque on the hot nozzle - this is about as much pressure as you can apply with one finger on a small spanner.
The nozzle does not need to be torqued down incredibly tightly to form a good seal, when at lower tempreatures the aluminium will contract and hold the Nozzle and HeatBreak together.
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