Wallmount filament spool rack (cheap)

I designed this simple filament spool rack to mount high up on my wall above the doors so I could have some out-of-the-way storage for spools.

Ingredients:
- Print: Brackets, qty 2+ (about one for every 3' of tube)
- Print: For each end that isn't against a wall, qty 1
- Print: For each end that is against a wall, qty 2
- Buy: 2x lengths of 1/2" EMT rigid conduit, length of your choice - sells for $5 for 10ft at a home store
- Buy: Tube cutter or other means to cut tube to length
- Buy: #10 pan head wood screws (with drywall anchors if not going into a stud)
- Buy: Some 5mm zipties
- Buy: 2x M3x8mm screws per endstop

Instructions:
1. Measure and attach brackets to the wall. If you put them to either side of a door, you're guaranteed to hit a stud. Otherwise, use a stud finder or drywall anchors (noting the weight limit if you use anchors).
2. Cut tube to length. I don't recommend an unsupported stick-out of more than a few inches.
3. For tube ends against a