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B-Bot 3 Wheel Z-Guide

by Buket0chicken Dec 21, 2016
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If I'm looking to print this, which files would I need? There's a bunch of files

It depends on how you support your bed. If you use a cantilevered design like the original D-Bot with the bed only running on the back two rails, you'll want the sliced or dovetail parts for extra strength.

If your bed runs on all four vertical posts, you can use the single piece parts as they will be slightly easier to assemble and the extra strength isn't needed.

You'll also need (2) upper spacers and (4) lower spacers for every Z-Guide you need.

Hello, can you remix them for that whells


Does this fit in as a replacement of the default D Bot Z Guide, or does the extrusion need to be shortened?

It will fit with the recommended extrusion length on the Z-Axis extrusion if that's what you're asking.

I like the idea, looks great!
Did you tried it yet?

No I haven't tried it yet. I plan to print it out and install it after the Holidays when I have some free time - about a week or so.

You might want to split it into two pieces as printing it with the default orientation (singe wheel portion upwards) will put the printed layers in a structurally weak orientation.

I thought about that, but there shouldn't be a ton of stress on the part. I plan to release a full log of my build, but my bed isn't cantilevered - I have it riding on each of the vertical rails so the primary stress would (should) be the tension on the arm from tightening the 3rd wheel. Especially if you print in PETG, I can't see the layers delaminating or fracturing.

If I get bored, I might split it and add a dovetail connection between the halves. which could be helpful for those using your, original design.

BTW, huge fan of your original design.

I like the idea of the alternative z-axis mounting. As another suggestion, you could separate the 2 side plates from the center "extrusion box" and locate them back to it with some simple recessed areas. Then your original bolts to connect to the extrusion will hold the "sandwich" together. This has the added benefit of allowing the side plates to be printed in the stronger orientation along with the extrusion box.

I had thought about that but it isn't necessary.

The sides of the "box" shouldn't be seeing much stress. If you have your bed cantilevered on the back two vertical posts, like the original D-Bot does, the part will be stronger if the sides are connected. They'll add some resistance to the torsion from the weight of the bed platform. If the sides weren't attached, the small amount of strength they add would be removed completely.

If you run the Z platform on all four vertical posts like I do, the side pieces are only needed to align the main sides. All of the stress from the weight of the bed will be concentrated on the holes for the wheel bolts, so the main concern is the taller sides of the bracket, not the sides where the wheels are at.

If you end up having issues with the strength of the part, I'd definitely look into cutting it up a little further like you said, but I really can't see that being needed.

I ended up getting bored and made 2 options for 2 piece prints. 1 option with a dovetail and 1 without

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