Dry MMU3 Buffer for Prusa Original Enclosure

UPDATE 16.7.25
As promised in point 9 in below description, I added the cover seals suiting my design. It's the same design as the original, suiting my cover.

It's a bit better with the humidity, but still not good enough for my liking.
Try to think about a better solution, but have no idea yet. Maybe one of you have one? 

********************** 3D2H **********************

ORIGINAL POST

After getting the prusa enclosure and filament dryers, the MMU3 buffer was the weak point. So I was looking to upgrade on that and looked up on printables if someone already has a solution. There I found the Dry MMU3 Buffer Box from @vono_art. I liked the idea but it needed some adjustment to fullifill my needs.

1. I wanted to have it mounted on the Prusa enclosure to have it out of the way and not standing around somewhere.
    
2. It has to be removeable easely of the enclosure for easy maintenance as replacing the silikagel.
    
3. Also, we're talking a drybox, therefore it was clear to me I have to add a hygrostat. I need to know air humidity inside.
    
4. @vono_art had six separaters, two at the outside as well, but there we have the wall of the box. Therefore I asked him why he has those. His answer
   
   I only add them to fix a problem of filaments getting caught by the buffer holders, especially if you use TPU filament. With the outer separators there is no chance of getting stucked.
   
   I print very rarley with TPU, and if I could load it in one of the middle once. So I decided to do a design with only 4 separates. NOTE, only difference is the bottom separater holder, which I made shorter. In the box cover I left the original six slots, so it's easy to upgrade to 6 separaters if you face same troubles as @vono_art.
    
5. Last but not least, I made a redesign of the silikagel tube for two reasons. First, one of the original once droped and broke immideately. So I made it a bit stronger. Secondly way more important to me, I believe @vono_art used a standard “M”-trhead. I don't like them as they run very poorly and are tough when 3d printed.
   For this reason i have designed my own thread which can be printed very well and runs very cleanly. In principle, it is a trapezoidal thread. i have already used this on several models and it works just perfectly.

Here we go with a pictured manual:

1. for the box i chose on of the listed once listed by @vono_art
   https://www.amazon.de/dp/B0CPP5KGJ4?ref=ppx_yo2ov_dt_b_product_details&th=1
    
2. To cut the box, I recommend to put it in the oven at 90°C for 10 minutes. Then you can cut it very easely.
   Cut the lid, but the wall around must not be removed because it is needed for gluing the buffer-box-cover.
   
   
    
3. OPTIONAL, if you plan to add the hygrostat
   I used the once you get from everywhere, example
   Cut a whole at the bottom of one side, 57x37 mm. 
   
   
    
4. Print the Hydrostataufnahme with any flex material and push it into the opening.
   I use preferably Fiberflex as it's very easy to print. Kind of the PLA of the flex materials.
   
   
    
5. For the Separater, you need 4x separator and 2x bufferholder_large both original from @vono_art, and 2x bufferholder_short.
   
   NOTE, if you plan to install 6x separator, you need the original bufferholder_prusaoriginal. You may use the once of the original buffer or print it.
   
   
    
6. Print the Silikagel tube and cap twice
   
   
    
7. Print the Buffer_original_v1, and put the lid into it. Use some glue to seal it.
   Note, the color change was not intented, I just run out of black ;)
   
   
   
    
8. Print the Buffer_original_aufhaenger. You'll need:
   2x M3 nut, 2x M3x8 screw
   NOTE, if you use the Automated Heating System of @Lars, you need 1x M3x8 and 1x M3x12
   
   It's desigen to fit on the enclosure, to the middle screw hole of one side and the left one of it, looking from the out side.
   
   
    
9. I didn't had the time yet for the cover-seal. NOTE, the once of @vono_art won't suit my design, therefore don't print them!
   
   I will deliver these later when I have some time. In the meantime, I will use the time to monitor the humidity in the container. This will then also reveal what these seals really do if installed.
    
10. For the PTFE pass trough, I recommend my design here.