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u/Accurate_Bedroom6277

Image 1 — Magura brake spares and honing tool
Image 2 — Magura brake spares and honing tool
Image 3 — Magura brake spares and honing tool
Image 4 — Magura brake spares and honing tool
Image 5 — Magura brake spares and honing tool
Image 6 — Magura brake spares and honing tool
Image 7 — Magura brake spares and honing tool
▲ 2 r/functionalprint

Magura brake spares and honing tool

Servicing the brakes on my bike and the flimsy screw tab on the side of the master piston retainer snapped off and as far as I can see, replacement parts are not available, needing a whole new brake lever.

Before giving in, I thought to just 3D print one.

The problem is that the layer lines create friction on the psston seal making them stick, and even after a bit of grease, I can still feel the seal rubbing across those layer lines.

So printed again with a slightly smaller bore, renamed it out to the required 10mm, and then finished off honing it out with wet and dry paper using this 3d printed honing tool.

Now it works just as well as the original, and more robust too. 😎

u/Accurate_Bedroom6277 — 11 hours ago
▲ 4 r/RockTumbling

My daughter has wanted a rock tumbler for a while now, so we have decided to build our own as a project.

But I have some questions about the drum itself.

It is going to be a desk top machine, and she wants it to polish stones, and also to create faux sea glass for jewelery making.

At the moment our design is based around a 150mm diameter drum, by probably 200 - 250mm.

Woukd it be best to keep it a simple cylinder, add baffles or go for a hexagonal drum?

Be gentle, everything I know about rock tumbling comes from a high school level understanding of erosion and 5 minutes spent looking through this subreddit before deciding to post this.

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u/Accurate_Bedroom6277 — 18 days ago