3D printed gun

[DamoB]

Hi guys. I've been spearfishing for 40 years and have ever only maintained my old guns. Being a toolmaker thought it would be a fun project to build some timber guns. I originally had it in mind to build some guns from teak but it was pretty expensive to even just purchase the timber from the local supplier here, so I opted for Iroko instead. Maybe later when I have got everything spot on I will try from teak. I drew up the gun stock shape I wanted with an ergonomic style handle and 3D printed it about 10 times until I got the shape pretty right. I'm happy with the shape now and together with some oval shaped aluminium extrusion, decided to make a few prototype guns to test out. I want to see the difference between the traditional design, a roller design & an inverted roller design. I've used the Ermes trigger and a Hunt single flopper 8mm spear shaft. I will mold some rubber caps for the back of the stock. I will post some more pics later.

 

[rollerGR]

Looks pretty good! Perhaps you could reduce the offset a bit more?

An 8mm shaft won't be very smooth for either of the setups you want to try unless you really push it. Think of 4x14mm conventional (ergo recoil, even with a wooden gun), or a 2x16mm double roller or a 4-band invert gun (1x19mm + 3x16mm). 8mm shafts are pretty heavy for any gun unless you're building a tuna gun.

Easiest choice is to turn it into an invert (polyspast) or a fusion 3, since both of these systems use the same muzzle.

 

[DamoB]

The idea was to make a few and see the differences first hand, recoil etc. The 8mm shaft is 130mm long so weight is actually the same as another gun with a longer 7mm shaft. The track I have made quite deep (7mm) so am curious if that is a restriction at all. I had planned on 3 x 16mm rubbers on the standard setup. 1 x 16mm rubber on the roller gun, and 3 pairs of 16mm rubbers underneath on the inverted roller. I'll just use 16mm as a start point.

 

[rollerGR]

The idea was to make a few and see the differences first hand, recoil etc. The 8mm shaft is 130mm long so weight is actually the same as another gun with a longer 7mm shaft. The track I have made quite deep (7mm) so am curious if that is a restriction at all. I had planned on 3 x 16mm rubbers on the standard setup. 1 x 16mm rubber on the roller gun, and 3 pairs of 16mm rubbers underneath on the inverted roller. I'll just use 16mm as a start point.

On-tip 8mm is far more doable than a long 8mm one. Standard setup is fine (you could even try 1x14+2x16), 1x16 for a single roller is definitely slow but might not matter (I use Mediterranean conditions as a reference, but single rollers with heavy shafts work fine in e.g. Oceania - slow shot doesn't hurt there). 3x16 invert is kinda like an 1x18 single roller. Recoil will be very low on these guns, even if you powered up the invert with 4x16.

Deep track looks like a decent enclosed track, it won't affect the shot negatively if it's done well. Enclosed tracks actually improve the shot a bit by reducing tail lift.

 

[DamoB]

On-tip 8mm is far more doable than a long 8mm one. Standard setup is fine (you could even try 1x14+2x16), 1x16 for a single roller is definitely slow but might not matter (I use Mediterranean conditions as a reference, but single rollers with heavy shafts work fine in e.g. Oceania - slow shot doesn't hurt there). 3x16 invert is kinda like an 1x18 single roller. Recoil will be very low on these guns, even if you powered up the invert with 4x16.

Deep track looks like a decent enclosed track, it won't affect the shot negatively if it's done well. Enclosed tracks actually improve the shot a bit by reducing tail lift.

Enclosing the track would be something easy for me to try as well as the track is also 3D printed. At the moment it's open, just deep.

 

[rollerGR]

Enclosing the track would be something easy for me to try as well as the track is also 3D printed. At the moment it's open, just deep.

Interesting, it reminds me a lot of the Pathos sniper semi-enclosed track. I'm interested in feedback of the performance it has, since a deeper track is easier to make than an enclosed track and if it improves performance I might adopt it. Looking forward to updates!