SDHayes kindly made metric, but you still had to pause his to insert nuts. I remixed to have slits to slide nuts in after printing, it worked first time.

This works by ‘sacrificial layers’ bridging, so check in your slider that the 0.2 bridge layer is laying in across the entire hole. You then poke through the weak layer with a screwdriver, it drive out the tiny bits of plastic - it cleans up fine. The nyloc nuts are meant to be tight, so push them in well once your detritus is removed from the sacrificial layers, it should need no filing or heating, this took <5 mins.

Obviously, you'll need to slide the flat sides of the nut in at the angle the nut is held, so look at your slicer layers to make sure you're not wasting time pushing in a nut at the wrong angle, it has to be snug & straight.

I had thread conflicts on 2 of 3 that resolved by backing off the screw, checking for debris, and then flipping the regular nut upside-down to how it was, and all 3 screws went through straight away. It really was all 5 mins.

I love not pausing… the end product works the same and you can just print overnight.

4x Nyloc M5 nuts - nyloc narrower side to mirror

3x Regular M5 nuts

3x Square M5 Nuts - to clamp tubes