# Extension layers - how many to cover a Unicorn HAT?

**URL:** <https://forums.pimoroni.com/t/extension-layers-how-many-to-cover-a-unicorn-hat/303>\
**Category:** Support\
**Created:** [January 23, 2015, 3:29pm UTC](https://forums.pimoroni.com/t/extension-layers-how-many-to-cover-a-unicorn-hat/303 "2015-01-23T15:29:28Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Snips](https://avatars.discourse-cdn.com/v4/letter/s/a5b964/32.png) [@Snips](https://forums.pimoroni.com/u/Snips)\
**Post date:** [January 23, 2015, 3:29pm UTC](https://forums.pimoroni.com/t/extension-layers-how-many-to-cover-a-unicorn-hat/303/1 "2015-01-23T15:29:28Z")

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Hi,

There’s a great video of a diffusion layer over a Unicorn HAT.

Please could you let us know how many extension layers are required to fit a diffusion layer over the HAT?

Thank you.

Nigel

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**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\
**Post date:** [January 23, 2015, 3:55pm UTC](https://forums.pimoroni.com/t/extension-layers-how-many-to-cover-a-unicorn-hat/303/2 "2015-01-23T15:55:14Z")

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I’m assuming you have a PiBow Coupe? ( the one that’s 6 layers in total with a hole for GPIO ) If not, then you can ignore the below and just get a frosted top! I recommend the Ninja top, since I think it looks better.

The video showed the UnicornHAT inside a full-sized PiBow which consists of 4 additional layers- 3 of which are cut around the USB ports.

You would need to get a full-sized PiBow to obtain the right layers- getting extension layers and cutting them yourself would probably lead to breakages, which is not something you want to happen with £8 worth of layers!

If you get a PiBow Ninja and a frosted top, for example, you’ve got options. You could then use your Coupe top to have a Ninja Coupe, or the frosted-top on the Ninja.

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**Author:** ![Snips](https://avatars.discourse-cdn.com/v4/letter/s/a5b964/32.png) [@Snips](https://forums.pimoroni.com/u/Snips)\
**Post date:** [January 23, 2015, 4:18pm UTC](https://forums.pimoroni.com/t/extension-layers-how-many-to-cover-a-unicorn-hat/303/3 "2015-01-23T16:18:02Z")

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Ah, yes, I have a PiBow Coupe.

OK, I’ll get a full size PiBow (just the excuse I needed) and a frosted top.

I think I’ll opt for ‘classic’ rainbow for the full multi-coloured effect.

Thanks for your quick reply!

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**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\
**Post date:** [January 23, 2015, 4:22pm UTC](https://forums.pimoroni.com/t/extension-layers-how-many-to-cover-a-unicorn-hat/303/4 "2015-01-23T16:22:52Z")

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No problem! Glad to be a provider of excuses ;)

And do post pictures/video when you get it up and running!