PCB Feet/Standoffs for M3

Basic "I don't want my protoboard shorting or gouging holes in my desk" feet/standoffs for M3-drilled 1.6 mm thick PCBs.

Print Settings

Printer Brand:

Prusa

Printer:

I3 MK3S

Rafts:

No

Supports:

No

Resolution:

0.2 mm

Infill:

15%

Filament: Eco Tough PLA Yellow

Notes:

These will have a bit of play once installed, but they shouldn't fall out.

“In a hurry” sums it up quite well. I had to get a load of demo PCBs out for my former employer, and I noticed they were likely to tear chunks out of any desk they were put on. So the model was written in under 5 minutes and put up here without another thought. And of course it gets front-paged and picks up thousands of likes ☹

To answer questions from the comments: it's meant for M3-drilled (3 mm diameter) PCBs 1.6 mm thick. For smaller holes you can scale it.

The code is currently uncommented, un-paramterized and has no documentation because it was meant as a throwaway. But if you want to modify it:

// circuit board feet - scruss, 2021-03 $fn=64;

difference() { union() { cylinder(d=12,h=5); cylinder(d=2.8,h=8); translate([0,0,7])intersection() { cylinder(d1=3.5,d2=2,h=6); cube([2.8,10,20], center=true); } } translate([0,0,6+20/2])cube([20,0.6,20], center=true); }

• The M3 diameter is represented by the values "2.8" in lines 7 and 10. The "3.5" in line 9 is the "a bit more than M3" so the standoffs won't fall out.
• The 1.6 mm thickness is modelled by the 2 mm distance between the 5 mm high base line 6) and the retainer part translated 7 mm up (line 8).

Good luck! One day I might parameterize this …