Fridge 2 liter bottle stacking system

Why you need this
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Unfortunately, my new fridge could not take 2 liter bottles in the door compartment. I have to lay down the bottles, thus leaving space unused in the fridge. That's why I needed this stacking system.

Parts in the design
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* **bottleholder_lower**: use this part for storing the bottle at the bottom. You can use several of these and stack them. You need two of these per bottle.
* **bottleholder_upper**: use this part for the bottle laying at the top of the stack. No need to use extra PLA material ;-). You'll also need two of these.
* **bottleholder_rod**: these are used to join pairs of the bottleholder_lower and bottleholder_upper. You'll need two of these per pair.
* **bottleholder_join**; these are _optional_. If you can glue apart pieces adequately, you will not need them. You'll need four of them to join the corners of the bottle holders

Additional remarks
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* My design is made to be used without additional