I’m building a batch 4 for a friend and his was pretty tight too. First I put all the screws where they go and then gave it some really gentle taps with a rubber mallet to get them fully seated.
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I also use gentle taps with a rubber mallet, to get a nice snug fit.
I got my kit yesterday and started building it too.
It seems that I also need to sand all the 3D printed tubing connectors. I was wondering if I could use aceton or something to smooth these up. Has anyone tried that?
These parts feel like ABS plastic, can anyone confirm if they are ABS?
They are PLA, as for sanding i would make sure your tubes are nice and open sometimes the ends can get pushed in from the factory so make sure they are the correct profile at the ends and they should fit on nicely.
You are right. That was the problem, the tubes were a little flattened from the middle of the end. I realized that soon after writing about it here 
I bent the tubes back nicely open and indeed, they fit now nicely.
The hoop connectors (3D printed parts) are actually the right size, but there is a technique for fitting them in. You need to put the hoop (aluminum extrusion) at an angle to the 3d part to get the outside of the extrusion onto the edge of the 3D printed part, and then push it in while shimmying it back and forth. They do fit.
Do you have a list of the mods you’re printing up? I so, would you minds sharing the list and links to the files?
I dont have a list, look at GliderPilot’s build. I’m planning the Switches for sure, and the hinge stops. They have already implemented several of his other ideas into Batch 4 I see.
I haven’t been able to work on this much, but I finally got some more time this weekend, I got the first Arm put together. I saw from some of the other builds that the standoffs in the hoop connector pieces weren’t threaded deep enough, but I didn’t notice any problem. Mine went right together I did however notice that I did not have enough of the 30mm m3 bolts to put them all together. Kit only had 8 and will require 16.
And here is the completed leg assembly
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Do you have any pictures of the Batch 4 you built? specifically the wiring?
Thanks, that’s perfect, I had to put my project on hold due to a family emergency. But my batteries showed up and got me started working on it again. I just ordered my harness and the resister you recommended for your anti-spark switch. Hopefully in the next few weeks I’ll get it all put together, Maybe I’ll even get to fly before it gets to cold
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Did you redesign the Harness Standoffs (Top Corners)?
Yes, did I not post the files to my thread? I can.
I didn’t see it. It also looks like you have a new 4-way connector for the grounds? Do you have any other upgrades worth printing while I finish this up?
Here are the files for my latest version of the harness standoffs:
Harness Strap Standoff - Standoff Right.stl (634.7 KB)
Harness Strap Standoff - Standoff Left.stl (628.3 KB)
I used different connectors on my friends build and ended up having to redesign my original connector cover. So if the original ones don’t work for you then you could use this design:
Connector Cover 2 - Bottom.stl (250.4 KB)
Connector Cover 2 - Top.stl (248.1 KB)
One other item I haven’t uploaded is a twist lock pin for the horizontal battery rails. Use a 30mm bolt as a pin. A spring pushes the bolt out and a lever locks it open:
Twist Lock 6mm Travel - Part 2.stl (873.9 KB)
Twist Lock 6mm Travel - Part 1.stl (650.5 KB)
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Hi Paul Gliderpilot.
Please could you clarify how the webbing strap is routed through your harness strap standoffs. The way I have it, the strap passes through the lower slot, then loops internally within the standoff then exits thru the top slot. So the strap makes no contact with the rear carbon frame (the one to which the batteries are mounted). Is that correct?? What was the purpose of these standoffs? thanks
Hi Andrew, it sounds like you installed the harness standoffs backwards. You need to swap them left to right and flip the over. The webbing goes through the top slot, out the top slot on the battery side then through the bottom slot which directs it back out the top slot again.
This makes it much easier to fold because the webbing makes a hinge of sorts. It also backs the carbon so it doesn’t bend.
This shows the path without the standoff and explains it further:
This shows it with my original stand-off design which threads the same way just has a different shape:
Thanks Paul. I swapped them around & it works fine now. My x4 is finally ready now. I like it a lot. A bit more ground testing & hang check then looking forward to 1st flight.
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