M5 M4 and M3 nuts for your 3030 aluminum extrusion.
No need to access ends of your aluminum extrusion, these can be inserted right into groove and rotated 90°.
Made with 0,3mm(d) tolerances for holes.
Included are dimensions of aluminum extrusion for which these were made for.
If your printer has problems with small objects sticking to bed, use raft. ( I use it with this print , depends on your printer )
I slow down my printer when printing small batches of these, for better detail and to keep layer time reasonable so it has time to cool off.
Use 3 walls (and top/bottom layers), or just 100% infill.
Inseting the nut
For better fit, screw the nut onto the tip of longer screw and heat it for few seconds above lighter/candle flame, then inset it in place.
This way the nut will hold better and not fall of.