Another version of a API Test Kit Holder. This was fashioned after one designed by waleedk at:
https://www.thingiverse.com/thing:2440207

I liked the design, but wanted to customize it for my water test kit. I spent an 1 1/2 hours trying to figure out how to modify the SCAD design, and finally juts re-drew it in Fusion 360, in about 30 minutes.

The customizations I made include, increasing the drain hole size, modified the sized of the bottle holder slots (both of these were simple in SCAD), and eliminated the extra bottle slots for Nitrite, GH and KH (this is where I had trouble in SCAD). I also used the space behind the Nitrite bottle to place holes for storage of the 20ml hypodermic and blunt needle that I use for drawing water out of my tank, and filling the test tubes.

Note: I output the background and the Test tube holder as separate parts, thinking it might be quicker to print that way. Turns out it prints faster as a single piece. Just load both parts together and print as a single item.