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All Springer/NP/PCP Air Gun Discussion General > 3D printing and files

.22 Marauder 32 mm OD x 140 mm LDCs - Direct shroud mount; and 1/2-20

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subscriber:
By the way, the PROD LDC could have been designed longer.  I chose 4" because it is a pistol and adding too much length would not appeal to too many people.  If you want a longer version for less pop, speak the word.

rualert:
      Thank you sir. I will start a new thread for my P-Rod and link this thread so other can benefit from this work as well. If you would like to stretch the unit a bit more I am happy to print it and test it out. I will also print and post results for the V2 of the 4" along with some decent DB level readings so all may compare. I am using a phone program, but I have a calibrated mic to go with it. That said, all first test are done with the phones built in mic to ensure they are a safe level for the good mic. I will PM you with another idea we might also collaborate on. I'm still a beginner with 3D design, but I'm learning.

Thanks again for the assist and the design work sir, very much appreciated.

Casey

subscriber:
Casey,

I have taken the 4" LDC version with the conical rear and stretched it via a "natural baffle increment".  See image comparison below, with the 4" version at the top.  The longer version just happens to end up at 150 mm; or just short of 6".

Truth be told, it looks a bit skinny for the 1" OD, but if it works better and does not clip from "whip", or  break off, then it would be a viable option. 

Clipping is not likely, unless the LDC attaches visibly skew, as the bore is generous for .22, and tapers larger towards the front.

The STL for the V2 version with more thread relief is included in the attached ZIP file.
Suggestions for printing these are the same as for the above versions.

subscriber:
So, I thought there might be interest in a PROD LDC that looks like a longer shroud:  I took the "4 inch" version and reduced the outside diameter to more closely match the shroud OD.  See images below.

The ZIP file contains two STLs.  The V2 file has the same relieved threads as do the earlier LDCs above.  Version 1 has the slightly tighter threads.   I did not convert the 150 mm long LDC version, as that seems too skinny to me.

rualert:
     Al, since I was the one who asked Subscriber for the P-Rod LDC/Extension I would like to publicly state that I have printed every version, tested them and they work fantastically. I prefer the V2 with the taper in the 105mm length, but the straight version that matches the shroud diameter works just as well, and takes the last bit of sharpness out of the P-Rod. I have printed the one I use most in both PLA, (first test) , PLA+, and finally one in PETG.  I also have carbon fiber filament so if I ever do have any issues I can make one from that as well. I tend to stick to the matte finish PLA+ and PETG, but the few parts I have printed in CF come out fantastic looking. The sound is great, as is the look. Thank you Subscriber for the great addition for the P-Rod shooters that want that last little bit.

Casey

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