CR-10s Pro 18mm to 8mm diameter probe sensor adapter

cults3d

The standard automatic bed levelling sensor that comes with the CR-10s Pro v1 is an 18mm diameter capacitative probe. As it has poor repeatability - due to sensitivity to environment factors - many people replace this with an equivalently sized inductive probe (e.g. LJ18A3-8-Z/BX - see instructional video here: https://www.youtube.com/watch?v=VH3zrRNOGfA). While this is an improvement over the stock capacitative probe, there are still issues with repeatability. Inductive probes suffer from temperature drift, and their repeat accuracy is typically reported as a percentage of the sensing range (Sr in the datasheets). The large flat surface at the end of the wider inductive probes "collect" more heat from the bed. When the nozzle is hot and entire x-carriage gets warm, which in turn heats the probe up through conduction. This is an extremely simple fix to let you fit a more accurate 8mm probe (sensing range 2mm) to the CR-10s Pro, so that the probe is thermally separated from the nozzle. For me this is a significant improvement over the LJ18A3-8-Z/BX. The probe I purchased is LJ8A3-2-Z/BX. Ensure that you've bought the NPN-NO variant. I used a 6mm (flat tipped) grub screw to hold the probe in place.