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December 13, 2019, 10:19:56 AM
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| |-+  Kel-Tec RFB, RDB, M-43 (Moderator: Ronmar)
| | |-+  Wanted to show off my 3D printed RDB handguard
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Author Topic: Wanted to show off my 3D printed RDB handguard  (Read 1132 times)
pat_bcr
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« on: August 09, 2019, 01:31:43 PM »

Hey all,

 I just started getting into the RDB, and while I like the gun, I hate the stock handguard. I had a 2D sketch turned into a model and then a prototype printed to test the proof of concept.

 I like the slimmer lines of this handguard but there are definite areas to change and improve. I'll update when I can, but this is just a hobby project for me at the moment.


* IMG_20190807_165449_208.jpg (984.82 KB, 3213x1682 - viewed 245 times.)
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BullPop
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« Reply #1 on: August 10, 2019, 01:21:59 PM »

nice

magpul slots?

hot barrel an issue?
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BellatorInvictus
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« Reply #2 on: August 10, 2019, 06:40:10 PM »

Looks nice and clean. What material? What printing process?
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pat_bcr
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« Reply #3 on: August 12, 2019, 01:30:48 PM »

Yes, they're MLOK slots. I definitely need to do some tweaking to the layout but it's a huge improvement to the original handguard. I wanted to see if I could design a lightweight, low profile MLOK version that wasn't as 'tall' as the Lucky Irishman or the KelTec MLOK version.

 This was an FDM print and I think it's just ABS plastic. I didn't ask the printer lol. I don't think it'd stand up to major heat loads in its current format unless I change some materials or alter the way it locks into the gas block. Ideally, I'd like to get the final version made out of Aluminum but that's very expensive.
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waffenmeister
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« Reply #4 on: August 12, 2019, 03:23:30 PM »

Did you test with 100+ rounds in 1 hour? Can you share STLs?
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pat_bcr
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« Reply #5 on: August 12, 2019, 07:53:32 PM »

I haven't put any rounds through it just yet, but I wouldn't expect much in this iteration. The one advantage is that it's secured to the gas block using an aluminum spacer that runs where the original push pin used to be. Two screws are used on opposite sides to clamp down onto the gas block.

 I'm hesitant to release an STL just because I'm considering getting the design made up in aluminum and I don't want to potentially complicate any future business arrangements. If I change my mind and decide not to go the manufacturing route, I'll be happy to share it publicly.
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waffenmeister
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« Reply #6 on: August 13, 2019, 08:32:56 AM »

Aluminium is the past century. Aim to composite materials like carbon fiber
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pat_bcr
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« Reply #7 on: August 13, 2019, 01:10:07 PM »

I don't disagree with you, and I was thinking of doing a second print after making my design changes in carbon-fiber reinforce nylon.

However, I am poor and only have so much coin to throw at a passion project, so I'll be lucky if I ever get one made out of aluminum at this rate lol
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Sputnik90
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« Reply #8 on: September 05, 2019, 12:16:41 PM »

 
Looks very nice!

I can confirm that carbon-fiber-reinforced nylon is the way to go for home printing of firearm accessories.  The carbon fiber keeps the parts warpage low, and the nylon has decent engineering properties even in the Z-direction, which is where most FDM prints and materials will fail.

I might be able to print one for you if that's your bottleneck.  I already have a Lucky Irishman aluminum guard, so I'm not much interested in disassembling it to test for you.
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mig1nc
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« Reply #9 on: October 13, 2019, 12:20:11 PM »

Have you thought about making a top cover for the front, with a gap to adjust the gas regulator kind of like the gap on the Sig MCX?
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pat_bcr
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« Reply #10 on: October 22, 2019, 05:41:51 PM »

I actually had, yeah. I've kind of put this project on the back burner, because I don't have a ton of 3d design skill (or time, or money) to work on improving the design, even though I think it has potential. I think once the official Kel-Tec MLOK aluminum handguard comes out, there's going to be very little demand for my design. I've tried to find a manufacturer to team up with and get an aluminum version made, but I haven't had any luck.

I also thought about making a version that would use an extended picatinny rail. Picture a two-piece aluminum handguard, incorporating a replacement scope rail that would extend to the lock nut on the 17" barrel version, with appropriate cutouts for the charging handle and gas adjustment knob. It'd attach to an aluminum handguard similar to my design, but with a top cover to meet and interface with the extended rail. Just another concept I was tinkering with.
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mig1nc
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« Reply #11 on: October 22, 2019, 06:31:47 PM »

Man, that sounds pretty cool.

I hope you can still make it. If it's good enough, people will still buy it over the factory one.
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