Filament Drybox and Buffer for MMU3

What is needed for a box. 
1x box https://www.amazon.de/dp/B0CFLJCJSF?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
4x bearing https://www.amazon.de/dp/B08JLXN2BN?ref=ppx_yo2ov_dt_b_fed_asin_title
1x Hygrometer https://www.amazon.de/dp/B07XD7VRFQ?ref=ppx_yo2ov_dt_b_fed_asin_title

1x axle diameter 8mm 73mm long
1x axle diameter 8mm 79mm long
1x PTFE connection. It is a version for M7 or M8.
Silica gel. https://www.amazon.de/gp/product/B07DXZ4VHR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I have tried different arrangements but this solution is the best for me for loading and general use.
You can see my arrangement in the picture. PTFE connection and hygrometer are on the same side. 

Make sure you mark the holes for the Pfte connections on the correct side. The filament roller can only be inserted into the box in one direction!

I printed the rollers in TPU but they should work just as well with any other material.

I have ten of these boxes to have the most important filaments ready.

On my other models there is a sealed cap to close the boxes when they are not in use.

https://www.printables.com/de/model/998375-ptfe-cup-with-seal-for-filament-dry-box

Edit 1

I recommend something like this for the silica. 

https://www.printables.com/model/402087-adjustable-spool-holder-for-silica-gel-spool-weigh

It has several advantages.  The balls stay where they should be and the extra weight helps with almost empty rollers. I am about to equip all my boxes with it.

Edit 2

There were sometimes problems with a cardboard cover roll.
That's why I added a frame to hold the bearing unit in position.
I also made short struts that are inserted at the top.
I also strongly recommend not to put the silica in the tub, or only very little, as it can actually block the bearing.
When fitting the cover, make sure that nothing gets jammed.

Edit 3

Axle not tested!!!!!
Perhaps it is not easy for everyone to get the axle parts.

That's why I've added a printed version. I have not tested it yet. But it should also work.
You can give feedback in the comments.