4040 Profile

My recreation of the 4040 profiles, it can be customized to have desired length or inner diameter (5mm to 8mm)

For different sized profiles also check,
2020 Profile => https://www.thingiverse.com/thing:2533048
2040 Profile => https://www.thingiverse.com/thing:2533065
2060 Profile => https://www.thingiverse.com/thing:2533084
2040 Profile corner => https://www.thingiverse.com/thing:2533101
3030 Profile => https://www.thingiverse.com/thing:2534742