I had big issues to find a good Prop/Motor combo to built quadcopter with high efficiency or high thrust, without risking to burn my motors or ESCs. Because there was no Prop testbench build available and I wanted something nice looking instead something built of wood manually, I decided to design my own 3D printable testbench.
With this setup you can use a generic kitchen scale to measure propeller thrust on the bench. It should be suitable for props from 5 to 12 Inch (smaller props could have issues with airflow).
I designed this thing as a pusher setup to minimize loss of thrust by pushing air against the frame. Length of the Motor side and the scale side of the arm is exact 150mm from turning point so the measurement should be very exact.
Video of first Testrun: https://youtu.be/-_s6RcAOIgQ
I had no M3 bolts long enough so I improvised with half lenght bolts and a rubber band. Works fine too :)
Should be printed as massive as possible. I think 50% infill with 2mm shell thickness should be fine because big props and motors can do up to 2kg of thrust. Motor plates with shaft holes need support!
Update - 13.5.2018
After printing, I realized that the motor mount needs clearance for the motor shaft spring on many motors. So I updated all 3 sizes with a 10mm wide and 2.5mm Deep clearance (5mm wide on 20mm plate). I also added a 5mm whole for motors with 2-sided shafts for 30 and 40mm plates. I kept the original mount plates , because then you can print without support and you can use some washers instead too.
If any other changes needed or issues found, please leave a comment and I'll watch into it.