Supported probe diameter is 12mm (using the adapter) and 18 mm.
I designed this because my hotend cooler gave up (and had a 60mm fan lying around). Tested it on the Ender 3, should work for Ender 2 & CR10. Minimized air flow from the hotend cooler to the printed object.
For the 60mm fan i used two m4x16 screws. Apart from that the stock screws were used. All holes are a bit smaller than their corresponding screws such that they should work.
If your printer provides a higher voltage than the fans maximum, you need to use a resistance (which can handle the power dissipation) or a "step down dc-dc voltage converter" available on ebay, aliexpress asf.
I am using the 12mm diameter inductive sensor LJ12A3-4-Z/BX (aliexpress) and a 1mm "pertinax" printing surface on top of the metal bed (pertinax is great for ABS, PLA and PETG). Keep in mind that the inductive sensor detects metal within a short range and therefore the paper must not be larger than 1mm (the 18mm diameter LJ18A3-8-Z/BX might provide a larger detection range).
A nice test on ABL probes: https://www.youtube.com/watch?v=il9bNWn66BY
Here is a nice HowTo on the pertinax printing surface. You might want to use google translate.
Probe offset (in mm):
X = -45; Y = -9.65
Walls of the model are (mostly) 1.05mm thick.
Notes on v2
- The height of the holder can now be slightly adjusted (which you might need for another hotend or nozzle)
- The location of the probe holder has changed slightly to avoid collision on x-home
- The fang of the part cooler is now located higher to avoid bed collision
Notes on v3
- The location of the probe holder has been further adjusted for easier fasten of the probe
Notes on v4
- Moved the fang 2mm to the left (cables of fan did rub slightly against the metal)
I recommend using ABS since it has a high glas transition temperature. PLA will likely deform if the part cooling fan is off while printing. PETG should work too.