Everything you need to know is given full instructions here. Keep up to date with any updated here also.

Please note I have know moved the whole system away from the RF-Nano over to the much more capable ESP32. There have also been a number of changes to the parts since making this video so please be sure to download the latest parts either here or from Thiniverse website before you start printing. The biggest change to the slider is that the Nextion display is know a WIFI remote which can be freely moved around the system to best suit your working preferences. I will be adding another video soon to show the changes.