I went through the troublshooting on the wiki for it. The tube is plenty extended (as I said it's hitting the lip inside the PEEK and there is plenty of gap once the bolts are tightened down solid (a good 1mm+ gap between alu plate and the wood)
I didn't confirm 100% if it was perfectly flat, but it did appear to be so. And as I said the leak was coming out between the PEEK and Aluminum block. It may have been leaking higher up, but then it went down through all the thread to leak out between peek and alu block.
Either way it's no longer leaking there at all. It's now leaking between the nozzle and the aluminum block.
I don't think it's possible to jam between the peek and the alu. Because the alu block is hot, and will always melt any blockage. Normal blockage seems to happen between the bowden tupe and the PEEK. This happens if the tube doesn't connect perfectly with the PEEK. Then molten PLA can creep in there and block your printer head.
Remove the end of the hotend, so you can see the end of the tube. Make sure it's atleast 9mm extended from the wooden part (guide says 8, but it's not always enough I think), and perfectly straight cut.
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