Added drag chain and upper holder with .scad for it

mjrice / wilson

Reprap Wilson, 3D printer design

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Added drag chain and upper holder with .scad for it #6

Open NeoTheFox opened 10 years ago

dantman commented 9 years ago

This seems to connect with a single T-nut and screw. Wouldn't it be better to take advantage of the T-slot extrusion and either make another 90˚ bend to fit 2 nuts (for stability) or make it snap directly onto the extrusion (like how this filament guide does)?

NeoTheFox commented 9 years ago

It is doable, however it would be more plastic. I found one screw sufficient, it never unscrewed on me.

dantman commented 9 years ago

Another alternative modification. On one piece of mjrice's smartmount you can see a small extra bulge of plastic next to a screw hole. That fits into the gap in the middle of the 2020 extrusion and stabilizes the piece preventing it from rotating. That's another possibility here. Although that might make it harder to print flat.

dantman commented 9 years ago

Could you upload a photo of this on a printer? What extruder head are you using? How did you orient your wires when constructing it?

I started printing this out to try on my printer. It wasn't oriented the way I expected (though my expectations of what direction it would face were probably wrong). But more importantly, I found the wl/holder didn't seem to extend far enough. The chain was at least 2cm (in the Y) away from where my wires came up off my extruder.

NeoTheFox commented 9 years ago

Take a look at photos This was intended as a part of my remix, so you can find links to originals and files there.

dantman commented 9 years ago

Ah, so it's supposed to be on the left. I thought it would go on the middle or right to avoid interfering with any filament being guided into the extruder.

So this profile of mount is designed for your bowden extruder. On the Wilson's default direct drive extruder, assuming you orient your extruder motor so the wires face upwards (as IIRC mjrice suggests in his assembly video) the location of the bundle of wires is another 2cm away from the frame. img_20150714_045605 img_20150714_045628 ((Maybe I got a bad angle of this))

Additionally I have a mild concern about how the chain is in-line with the threaded rod. So if the chain is mounted differently, given enough extra links, or the head moves into just the right spot, the chain may hit the right z-axis threaded rod instead of bumping a non-moving part or clearing the printer entirely. img_20150714_045654 ((I don't have enough links yet, I'm just showing that it is in line with the rods))

dantman commented 9 years ago

I've forked this tree and made some updates to it.

https://github.com/NeoTheFox/wilson/compare/master...dantman:chain

The new .scad file is parametric and supports changing the length of the bar.
I added support for padding for screws (the floor is 2mm but the Wilson printed parts and screws in the BOM are made for at least 4mm floors)
Allowed the location and number of screw holes to be customized (the inner screw hole and 2 outer screw holes can individually be enabled or disabled).

NeoTheFox commented 9 years ago

Wow, this is very cool, thanks!