Underbed Piezo Mounts

thingiverse

I started following the Precision Piezo thread on RepRap forums a while ago when some people (DjDemonD, Moriquendi) started coming up with brilliant ideas about using piezo disks as very sensitive switches/probes for bed probing. They later evolved into something called Precision Piezo (www.precisionpiezo.co.uk) I had one of the earlier Piezo boards by Moriquendi and initially tried the hotend mount, however I found it really difficult to dial in...and the results wouldn't be consistent (it was my own DIY solution though). So I went for the underbed method of mounting the piezo disks...and the result is amazing. The idea came from DjDemonD ( https://www.thingiverse.com/thing:2446460 ) Here is a video of the whole system in action (running grid leveling), you can see the mounts around 00:30 : https://photos.app.goo.gl/cz5BhU3H960tHeKa2 I designed the mounts for my 22cm diameter bed heater, however these mounts should work with most round (although not necessarily ) beds. This is intended for 20mm piezo disks. The model consists of 3 parts - the bed mount, cap and plunger, with the piezo disk sitting between the mount and the cap. I did not bother gluing the cap to the mount because it worked quite well without it, as well as I could adjust things if required (e.g. flip disks, etc). For a delta you'll need 3 of each part, as well as 3 M3 bolts (I used 12mm) and some T nuts. The bed rests comfortably on the plungers with a tiny gap between the mounts and the bed so as not to limit the bed vertical movement while probing. Make sure the plungers can get through the hole in the caps easily. Printed with 3 outlines and 3 base/top layers from PETG. I would probably want to avoid using PLA if using a heated bed, although it might still work ok.