水泥弹药模（26毫米，1英尺）

Concrete Ammunition Mold (26mm, 1")

2023-08-19 01:21:12

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Summary

This is an expandable mold for making concrete 1", 26mm projectiles. This process results in projectiles that weigh 24g, and clear 250-295 fps @ 300psi in my Nova N8. A 50lb bag of concrete should yield 1000 rounds.

Originally the top piece was designed to make hollow-back pellets like .22 caliber air gun pellets, but its not really needed, but can still be used to help pack the concrete.

Print two "side" pieces, and they fit together and can be filled. You can expand your ammo making capacity by printing more "center" sections.

If you need a pneumatic launcher, this is what i use: https://novapb.com/product/n8-fury-paintball-scenario-nerf-rocket-launcher/?ref=LXG

Combine that with an HPA compressor for in IRL Infinite ammo hack! https://amzn.to/3LgENze

Post-Printing

Making ammo:

These work with both TPU and PLA, but if you do go the PLA route, you really need to double up on release agents!

I coated my molds in PB Blaster blaster dry lube. It works very well as a release agent, and seems to be a fairly permanent coating, but I still supplement it with a bit of cooking oil on my PLA mold. You can get the dry lube here: https://amzn.to/3Rb3rFr

In the image you can see my setup. I have a large clamp in a vice, and the mold in the clamp. This works well because it gives you a nice way to apply vibrations to the mold, in order to get the air out. Use a drill with the biggest allen key you have to act as a vibrator. just push the octagonal shape of the allen key into the metal of the clamp beneath the mold, and drill until the bubbles stop.

For mixing the concrete I used fast setting post concrete, any will do, but I did pass it though a screen to get the larger rocks out. after mixing a small batch with water in a cup, it shouldn't be very watery, but add a dash of RapidSet Flow Control, and it will nearly instantly turn to a very pourable liquid. It is not required however, but it sure makes the process easy, and improves the quality of your ammo. You can see that stuff here: https://amzn.to/3rclOPt but DONT BUY IT THERE! Its $2 per bag at home depot! It is way over priced because of hazmat shipping.