Extended Notos muffler inserts

[subscriber]

The 12 FPE .22 Notos PCP is quiet from the factory.  For those who want to hear the hammer drop on firing, rather than the muzzle pop, I offer an extended insert, in two flavors: 

With grooves to hold O-rings, to help center the insert in the stock Notos housing; and a version without the O-ring grooves.

See images below to understand the differences.   STL print files are attached directly below.

[subscriber]

As the above Notos custom insert works rather well, I thought I would offer self-contained versions of the design for general consumption.  These may be attached directly as printed, to any platform that has a matching male threaded stud. 

While these bits are intended for 12 fpe, they should be good to 30 FPE.  For .177 and .22 only.

The first version below has a 1/2 - 20 UNF female thread. 
The second has a 13/16 - 28 female thread.  That is the same thread as a stock Marauder shroud; so a male thread adaptor will be required.

The STL files are attached directly below.

[miksatx]

Finished doing the 1/2”x20 inspired. Used my AirMax .22 for test.
No ldc 111.4 dBA
With Donny tanto 99.2
Inspired ldc 96.1

[subscriber]

Wow, Mike; thanks for your swift work

I hope your result encourages more people to try it.

Oh, by the way, what pellet weight and velocity were those sound values captured at?

[subscriber]

I don't want to be an ingrate, Mike, but do you have a 12 FPE .22 platform that you could try this LDC on?   Tested with the same setup as the Airmax.

Thanks again

[miksatx]

Wow, Mike; thanks for your swift work

I hope your result encourages more people to try it.

Oh, by the way, what pellet weight and velocity were those sound values captured at?

Crosman hp 14.3 825fps bout 20fpe.

[subscriber]

Thanks, Mike.  That is 21.6 FPE

[subscriber]

I realized yesterday, that despite the Notos being rated at 13 FPE on the PA site, it shoots at 19 or 20 FPE as set from the factory.  So, the guys that are now able to hear their hammer strike with my extended insert design installed, are actually shooting at 19 to 20 FPE (confirmed).

This means my statement about "intended for 12 FPE" is incorrect, because clearly it works at almost double that...

[bruce.net]

Thanks for all your work on these. Notos came in Wednesday, hand pump Thursday, printed Friday. I only had PLA which held up great for the 30 shots or so I tested it. Between the print and turning down the hammer spring results in LOUD targets and a quiet Notos.  Reprinting now with some fresh PTEG.

Bambu Lab prints it 4 walls / 100% infill in just over 2.5 hours. 

[subscriber]

Thanks, Bruce

Never heard of Bamboo labs before. 2.5 hours seems very fast.  Link for interested parties:  https://bambulab.com/en/p1

[bruce.net]

The Bambu Lab printers are pretty amazing.  I have been printing stuff for a few years, started with a Wanhoa Duplicator, then an Ender 2.  After "upgrading" to an Ender 3 Pro late last year, and its motherboard failing after a week, I started to research and came across Bambu.  They were just getting started after a Kickstarter campaign for their flagship, and were releasing the P1P around Christmas.  Not cheap at $699, but in line with the Prusa and other higher end consumer printers.

I printed another cone last evening in PETG, but I left it at normal speed.  The printer is so fast that it shakes the entire frame, so taller prints show more quality issues.  I reprinted overnight at 50% speed and it came out perfect.  It took 4.5 hours.

Hopefully I can attach the pictures, black is the PETG, white was the initial PLA print.

Thanks again.

[subscriber]

Nice looking prints; even at "half" speed.  What is the nozzle diameter; and vertical step size you used?

[bruce.net]

.4 nozzle and .20 layer height.

[subscriber]

Thanks, Bruce