added ubabot bottle cap to drinkrobotics page

input/projects/drinkrobotics.md

 
 [A video of our machine in action can be found on heise online](https://www.heise.de/make/meldung/Maker-Faire-Bodensee-2017-Cocktails-Cosplay-und-Casemodding-3772515.html#nav_im_wettbewerb_0) (scroll down).
 
+### Stuff
+
+I designed a 3D model for a cap enclosing the large open glass bottles we have for some ingredients. It is a 2-color model that can be printed with a dual-nozzle printer, or you can just leave out the "filling" and print it with a single-nozzle printer. The design [can be found in my Git Repo](https://git.xythobuz.de/thomas/3d-print-designs/src/branch/master/cocktail-maschine).
+
+<div class="lightgallery">
+    <a href="img/drinkrobotics_deckel.png">
+        <img src="img/drinkrobotics_deckel_small.png" alt="The 3D design of the bottle cap.">
+    </a>
+</div>
+
 ## Arduino-Cocktail
 
 Also in 2017, as part of some experiments regarding dispensing drinks in a cocktail machine using carbon dioxide, I've built my own small Cubalibre machine.
 
 This machine has also been presented next to Ubabot at Makerfaires in Friedrichshafen and Hannover.
 It was used properly, to actually dispense drinks, at a birthday party.
-Unfortunately, I don't have any photos or videos of the machine being in use.
+Unfortunately I don't have any photos or videos of the machine being in use.
+Also the Sodastream bottle and pressure reducer were only borrowed from a friend and I no longer have them.