Thanks for the info and the hint. I will take care and give them a try.
Before re-machining (cheap chinese had inner diameter of 2.8mm) they were very tight so that they were moving with the steel part when screwing it in or out. Now, due to the ER Collets, they were squeezed a bit (had to re-drill the inner diameter) and they sit more on the loose side. Unfortunately I need the springs to realize my dual setup idea.
I will give them a try and when POC done, order original ones from UM...
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neotko 1,417
A point in between. If goes tootight it will deform when tightening the steel to the heater block (avoid using the spring and print an fixed height spacer). If it leaks remember that cleaning the steel coupler threads is very important or the burn material won’t allow the ptfe to contact the hotend making a gap that will add tons of blops, burn particles or even a big leak
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