Wanted a better adxl mount for setting up klipper, I have the BTT ADXL.

Two parts, first one, take the top screws out of fan if they are front mount as on the MSNG DD Extruder. Insert two longer M3 screws and attach, two short m3 screws attach the ADXL to the plate.

The second bed mount you attach the first mount to the second mount with some short M3 screws and use an M5 screw to snug it to the bed.

I would use PETG, these test parts are PLA

Petg is just stronger as you will be tapping threads in.
It really shouldn't matter as these tests are done COLD so the fans and heat should all be off.

But if you use PLA, I would heat up the screw with a lighter a bit at least before making threads so that you don' t crack the plastic.

The Bed mount I would rotate so the it looks like a "U" on the build plate.

I beefed up a couple MM on edges vs what's in the picture so it may look a bit different when you print it!