M3 square nut for 1515 profile. It is chamfered to a trapezoidal shape, so it can be inserted into the profile afterwards.
You can even prevent slippage with a printed part:
github.com/MotorDynamicsLab/LDOVoron0/STLs/Slide_In_Nut_Support.stl
20pcs / package
4.32 €
Unit price: 0.22 €/db
pcs
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