HBP Cupcake

[Joheinz]

Hi *,

I have the HPB installed on a Cupcake and awhile ago I drilled the 4
corner holes so that I can use countersink screws to avoid bumping
into the screws when making large prints. Unfortunately I did not do a
brilliant job with my Dremel, and now I'd like to commission a panel
service to recreate the aluminium plate for me with 4 countersink
holes in the proper places.

Questions:

- should I use 4 holes or six to prevent warping of the plate? If
using 6, how would I go about leveling the platform?
- which alumunium works best, which thickness? Or another metal altogether?
- is it sufficient to use ordinary heater paste/thermal paste to
connect the plate to the PCB of the build platform?
- does someone have the measurements for the HBP? Which diameter, how
far is the distance of the screws (center) to the edges of the plate?
- I plan to go all PLA now, so I wonder if I should choose a
metal/kapton combination at all, or go for a glass plate. If yes,
which thickness has proven to work well?

Thanks,
Markus

[whosawhatsis]

I use a 3-point mount with a kapton-on-glass (4-inch square mirrors I found on amazon) suface, and it works great. If you're going for PLA though, you'll probably find that blue painter's tape on glass without heating gives you the best results.

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[Joheinz]

Can you send me some photographs how you did the 3 point mount? Did
you drill the mirrors?
Thanks,
Markus


2012/9/23 whosawhatsis <whosaw...@gmail.com>:

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[whosawhatsis]

The platform has six holes, I just used the corners on one side and the middle on the other. I put springs for leveling (much easier with 3-point, as they will always be coplanar unlike a 4-point) under the PCB. The PCB holes are countersunk with the glass laid on top. I'm holding the glass down with kapton tape along two sides.

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[Joheinz]

You drilled the PCB to countersink it? Did I get that right? the rest
makes sense, that is about how I have my current setup, apart from
using 4 holes because I was concerned that having only three mounts
would be to wobbly with springs, but if it works, it works. Thanks for
sharing.
Markus


2012/9/23 whosawhatsis <whosaw...@gmail.com>:

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[whosawhatsis]

Yeah, I countersunk the holes in the PCB. I highly recommend getting real countersink bit for this, rather than trying to fake it with the tip of an over-size drill bit.

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