Mel,I will work on this on Sunday.
I split the moderator so the longer of the two parts is under 9 cm long. They have alignment prongs for that can only be assembled the correct way round. The prongs should also provide more gluing area than a simple butt joint.The attached ZIP file contains both the front and rear section print files.See images below.I will make adjustments to the two parts, if indicated by trial fitting the test part to the pistol rail and muzzle. In fact, the rear section is the one likely to change.
My designs are intended to be self-supporting, when standing upright on the printer platen. What you said about printing on a diagonal to handle longer parts should work, if the parts are also 45 degrees above horizonal. To do that you will need to use external supports. These supports are then removed, after the part is complete.Any moderator design or print orientation that requires internal supports results in an unusable moderator. This is because internal supports cannot be removed. So, I try to avoid needing supports. I cheated a little with the tops of the hollowed slots that accept the alignment pins. Their are small sections that are unsupported there and should be cut wedge shaped at 45 degrees.When I get your part fit results I will make refinements to my models.
Fantastic design work as usual subscriber, you'd think that with the proliferation of rails on handguns this sort of attachment would be more common. One concern would be achieving a relatively air tight seal with the muzzle, allowing the gas to leak to atmosphere while it's at its highest pressure out of the barrel is going to reduce the effectiveness of the device.
Mel,It is possible that some of the other sketches include this information, but could you please measure aspects A to E shown in blue on your sketches, attached below?The length of the rail from the flat muzzle face (E) would ideally be longer than the sketch suggests. What is the maximum length feature I can design to engage that rail before it interferes with some other aspect of the pistol?Could you post some pictures of your pistol; straight from the side, and from the front?
Version 2B has a rear section just like V2, except the raised ring at the pistol muzzle interface is removed - in case it clashes with some of the other raised muzzle features.I also realized that you would need a Version 2 Test Print to verify rail fit and bore alignment. So the STL for that is attached with the full rear section for Version 2B, below.
Mel,If I understood correctly, that raised ring on the muzzle has an OD of 16 mm yes, correct. I made the hole in the back face of the moderator 16 mm in diameter with a radiused bevel that should be a close fit with the 16 mm OD ring. ok then, my mistake, just a newbie I prefer not to place material in the 5.4 mm ID section, because the metal part of the barrel moves forward as part of the firing cycle. I do not want to interfere with that. ok, forget then about previos post, all doubts will be solved when attaching the 1st test print big thanks!!
Mel,I would be happy to add a groove with a semi circular section. It is just that the gun muzzle seems to have other bumps on it. At the moment, the outside of that groove exists as the outer edge of a hole.No matter what the muzzle interface looks like, having the barrel bore to moderator bore concentric to perhaps 0.1 mm is more important. I would be happy to add the groove, but think it over constrains the interface, if it is shifted. Once we have that interface so close that no error can be seen on the test print, the groove makes sense.
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