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I finished putting my E3 together and was surprised to find Y-Home to be 10mm in front of the bed. Checking around, I find that is a common problem and most solutions point right here. So I grabbed this part and printed it out. I even installed it while my E3 was in the middle of a print.

This has pretty much solved my Y-Home problem, though, truthfully, I could have used maybe 5mm more in adjustment space, but I'm still satisfied. Thanks!

Must have been a much larger bug (actual insect) in the tapping jig at Creality (or whomever they get to cut their extrusions) that kept the extrusion from seating all the way back in the jig. It's difficult to imagine who at Creality would design a fixed endstop - even in a part they assemble - and then not check to see where the bed ends up. They obviously never inspect the parts.

I wonder if the original assembly could be used with shorter screws and T-nuts - without having to print this very necessary adapter...

Anyway, thanks Jonas!

Edit:
Yes. It somewhat embarrasses me to report that you can, in fact, simply replace the original bracket's supplied screws with a pair of M4x10 screws and some M4 T-nuts and you'll be able to put the original Y end-stop anywhere you want. And you don't have to remove the board and its overly-tight screws and risk damaging it or yourself.

Of course, if your original mounting bracket is broken, this thing is an excellent replacement.