3X Recoilless Rivet Gun Gridfinity Holder

This is a Gridfinity holder for my 3x recoilless rivet gun and the basic kit of rivet sets which are used with it.  I bought all of this stuff over 20 years ago; the rivet sets were a separate item purchased at the same time, but there wasn't a kit available with this gun, as there was with the standard rivet gun.  There would have been a lot of wasted space, so I incorporated recesses for the 5 piece set kit, the beehive spring, and a 3/4" brass faced rivet gun punch.  I don't like or use the universal joint/restrictor fitting that is normally included with a rivet gun (I prefer to adjust at the regulator upstream of the hose), but I did leave plenty of room for it in the tray.

I believe this rivet gun is still available from US Tool, although their website is a complete disaster these days.  Last I was able to check, it had gotten quite expensive compared to what I paid for mine.  But if you are planning to do a lot of riveting, the recoilless gun is probably worth the premium due to the fatigue reduction.  If you have a standard rivet gun (not recoilless), I recommend checking out the similar rivet tray for a standard gun by @Bnut157.  The body of the US3R extends farther out the back, so it needs a special tray.  This tray should of course also fit the 2X version.  the 4X unit may be too long, but it should be possible to modify it to fit in the slicer if you have a US4R.

At 5x6 squares total, it's kind of a big print.  I initially tried to print this in one piece on my 300mm Voron 2.4, but that print failed due to a problem with the spool of filament I was using.  For the second attempt, I thought better of that, and opted to split the model into two halves.  This has the added benefit of allowing it to be printed on a standard Prusa print bed on a Mk3/4 or Core One.

Like my other Gridfinity models, the base is altered to accept 6x3 magnets as a press fit, with the upper surface of the magnet holes modified to make the slicer bridge across correctly for a clean result.  Due to the size of this model, I have included sacrificial “mouse ears” in the CAD to give the ends more surface area to help prevent them warping off the bed.  These will need to be removed after printing.

Both halves were printed out of Overture PLA on my Bear upgraded Mk3S+, using a 0.6mm nozzle, at 0.3mm layer height.