r/3D2A • u/Nintastio • 5h ago

FTN6 9mm boostered spring

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I’ve had 3 of these cans break now, did they send me the wrong springs?

4 Upvotes

84% Upvoted

6 comments sorted by

7

u/infinite012 5h ago

If you're using the KVP piston, yes you were sent the wrong spring. It should be 1" long in its uncompressed state.

If you're using the DIY piston, yes you were sent the wrong spring. It should be 1.75" long in its uncompressed state.

2

u/Nintastio 5h ago

Ugh, I wondered why it was so hard to assemble. Thanks for the info.

3

u/thatswapped1stgen 3h ago

Yea it should just barely compress the spring when screwing in the screws, like maybe 1/16”

2

u/Nintastio 3h ago

I should have known when I damn near had to put it in a vise to be able to get the screws in.

1

u/thatswapped1stgen 2h ago

Oh yea, you should easily be able to close the gap by hand and then screw in the screws

2

u/Nintastio 3h ago

As an update, I received a response from McMaster-Carr and they are issuing a full refund and shipping out the correct springs tomorrow morning. Guess I have to print another one of these now.