• Questions

  • Any known ways to improve accuracy shifting on the Orca?

I have an Orca printed in Polymaker PA6-CF. I've definitely noticed some accuracy shifting just like Tim demonstrated in his Orca accuracy testing video. I also have Ivan's SF5 (which features a similar clamshell barrel mounting solution) printed from the same batch of PA6-CF, and it shoots way more consistently, with little to no noticeable shifting even after 400 rounds just today. Though perhaps that is partly due to it being chambered in a less powerful pistol cartridge (9mm) and having a much shorter barrel that may not wobble as aggressively after firing. Other than those things, the only main difference in the setup is that I did apply silicone RTV to the barrel mounts of the SF5.

I did print the barrel mounts in PA6-CF as well, though I think I recall the Orca instructions recommending a glass fiber nylon filament over the carbon fiber. Could it help to reprint the mounts in this other filament?

    MooringGrey How hot is the gun getting? If it's getting hot enough to soften the PA6-CF that could be the cause. If not, it's probably a loose barrel mount. If the latter, bedding in epoxy is probably a good option. You could also reprint the barrel mount with a bit higher flow to get a tighter fit.

        hoffmantactical epoxy? Like a JB weld? Or any two part epoxy?

        I also moved my red dot as closely over the barrel mount as possible to eliminate as much error as possible but i haven't taken it out like this yet.

        Granted mine is pla+ with the HT kit but the drifting is what keeps my orca a novelty versus a range toy.

            marriedwchildren256 Really any epoxy should have the needed temp resistance. I used JB weld along with aluminum powder. Coated the barrel and upper in a mix of carnauba wax and bees wax so I can hopefully get it apart latter if needed.

            How tight was your barrel mount? Even with the non bedded systems I was able to get less then 6 MOA shift, though I need to go back over the data.

                hoffmantactical the most shift isn't at the range but afterwards. I'm guessing from heat soak along with a slight torque bring applied in the case. So i try to be as slow as possible when packing up to make sure its cool.

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