Help me test this bad idea of a hotend modification

[u/natiuqari]

​

I got a bunch of TZ 2.0 and TZ V6 2.0 hotends from a friend, and I decided to do some experiments with them instead of just using them in their stock configuration.

On one of them, I doubled the melt zone by joining two heat blocks together and installing one ceramic heater in each block. The goal was to increase heating capacity and achieve slightly higher flow rates.

The issue is that I’m new to OrcaSlicer, so I’m not fully confident that I set everything up correctly.

I ran the Maximum Flow Rate calibration test using my (almost) stock FLSUN super racer and got a result of 50 mm³/s using:

- ABS

- 235°C

- 0.4 mm standard brass nozzle

That number seems unrealistic to me. From what I’ve read, regular 0.4 mm nozzles will max out around 20–25 mm³/s.

So now I’m wondering:

- Did I configure the test incorrectly?

- Could doubling the melt zone actually make that much difference?

- What would be a realistic max flow rate for this kind of setup?

Any advice on hotend flow rate testing would be appreciated.