Tool Holder Remix

Made a few changes to the original:
- removed the SD card slots in front, replaced with another shallow tray
- Added more material around the circular 'pen holders' to make them more sturdy
- The tall compartment in back had the same depth as the others (so why have it so tall?). I increased the depth so longer tools (rulers, etc) don't stick out the top as far.


If I ever need to print this again I'll spend more than 10 minutes on the remix. Things that should be changed:
- Reduce the 'dead space' between the compartments. No need to have a wall-infill-another wall for something like this. Just a single wall between the compartments would work just as well, save filament and printing time.