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Form for silicone cast button pad

by josefprusa, published

Form for silicone cast button pad by josefprusa Nov 22, 2009

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Summary

I\'ve designed form for casting silicone button pad. They have exact same dimensions as buttons on monome. Now I have to do few more tries to avoid some errors but Itll be great. Designed in OpenSCAD and its parametrized, so you can generate as big form as you want :-) there is a room for LED inside button, just like in button pad from Sparkfun etc.

It works, but the feel of pressing isn't same as on the monome, I\'ve updated design a little and it should be better now.

If you have vacuum chamber you are lucky and you can have bubble free cast :-)

I\'ve tried to embed some conductor when casting, but it wasn\'t great idea. Next time > cast and then glue the conductor :-) (in this case simple aluminium foil) >>> any tip for better and easier conductor??

Faceplate and PCB for this button pad is on the way too!! I\'m looking forward to print my own MONOME!!

Instructions

Start with small form like 1x1 or 2x2. Oil the form before casting. Provide feedback ;-) !!

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Hi! What bout this as a conductor: http://www.rfmicrolink.com/products.html#sheets

Question: as I know little of open scad--- can I modify the shape of the buttons? either in said program or sketchup? Of course I can right?!

Has anyone else been successful at this?

What did you use as a release agent?

Sorry, missed the bit about oiling it first. Motor oil? Olive oil? Does it matter?

Hello, I saw your form for the silicone buttons. I am searching for something like this. is it possible to buy such a form?

Jul 26, 2016 - Modified Jul 26, 2016
drato - in reply to jim

Well I checked the license of the buttons, josef allows commercial use, so you could probably get a printed version of this button: I am not sure how this works exactly, but I saw that the thing has a button for this: if you look to the right there should be a "Order this printed".

I am also not sure how this whole "Order this printed" works, if the designer gets revenue for this or just Thingiverse and the printing service(I think it is 3D Hubs). So I am not sure if josef is aware of this, you might want to ask him before using the service and let us know how it worked if you do use it.

By the way @josefprusa nice work, I am playing with the idea of creating a silicone mold for ages now, but was afraid to waist material and then not getting it to work. I think my interest to try it just came back :D

What type of silicone did you use?
Graphite might work for the conductor. Apply some adhesive to where you want the conductor and then sprinkle ground-up graphite over it. It would be similar to how one would apply glitter to a sheet of paper.

I've used 2component one for casting, from local factory :-)

Graphite is great idea!!I will try to mix some silicone with it and measure if its conductor :-) thanks

I know that this has been dead for almost a whole year, but I just wanted to mention that the core of standard cylindrical batteries ("AA" for example) is a graphite cylinder that could probably be used as a cheap source for this application.

Obviously be careful of battery acid melting your eyes and turning your fingers to mush.

Saw the pictures on flickr! Very cool project!
B.t.w. if you don't now what monome is: http://monome.org/http://monome.org/

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