Comparing ADXL345 nozzle mounted vs top mounted (Patreon)

On discord @thisiscam mentioned that nozzle mount are usually more accurate (less bias) but also more noisy (more variance)

After testing one nozzle mount he found that it would rotate even after being secured or while securing, so I made one with "arms" specifically for the Apollo that helps it keep it in place and oriented correctly regarding the X axis. Remove the silicon sock. This should work with V6/dragon/Rapido/Dragonfly BMO/ Top mounted Spider v3 pro. if you want to try with other hotends let me know. I tested it with a Rapido.

Did 2~3 runs of each, and calibration results interestingly ended up being extremely similar, between minimum and maximum resulting Hz, I had a delta of 0.8 on average regardless of the mount. which is good news as the nozzle mount is a bit of a hassle to install.

However if you want to give it a try, it's here with heat inserts, or here with screw in plastic

(will be included in the next "PRINTER MODS - by Squirrelf" zip upload in the master repo)

Unscrew nozzle (heat up and cool down), flat part of the mount will be facing up, cold screw the nozzle in (you could likely use a short M6 screw as well), and secure the ADXL.

Nozzle mount:

Top mounted (new backplate btw)

And while at it, added the updated Y axis moving bed model to accept m3x6 (more common than my old one for M3x4), which I print, once done, set the bed to stay hot,  screw the ADXL and run the calibration. Later can be reused with tape. download here

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One of the results while nozzle mounted. (here MVZ is at 58.8Hz another run had MVZ at 58Hz)

One of the results while top mounted. MVZ a 58.4Hz on both calibration run, which happened to be the average of two results of the nozzle mounted results. So that's the value I used in my klipper config.