13th September 2020 8:25 pm
If you will open a support ticket, CEL Support will provide you with a walk-through on how to do what you need to do without breaking your printer, including what tools you need and how to get around any tricky points.
Blockage in the Bowden tube is usually due to wet filament or using PLA with another material and bypassing the PLA mode option. The Bowden tube usually has to be replaced since the filament swells to fill the Bowden tube and can't be easily removed. Once you open a support ticket they can assist you to determine what parts you may need as well as the best way to go about making the replacement.
It looks like you also need to clean and lubricate your Z screws, so go to the support page on the CEL Robox website, create an account if you don't have one already, and log in. Then search for Lubrication and you will get the maintenance instructions. You may also be able to find the walk-through for changing the Bowden tube but it may be set so that you can only see it if you have a direct link.