TOPIC:

These are just supports, as the part get printed from the bottom and there are overhaning shapes.

Yeah... Supports... Any slicer do it's own representation of those things... And that's the main difficulty of resin  prints, I suspect...
 

Thank you.  Is it because tires will be printed with a soft material like rubber?

No, it's because supports required...

Following some reflexions on the supports following some comments I received, I went to the resin manufacturer website, and beside the profiles, there is also detailed support configuration to use for supports generation.

I did import that data in Chitubox, there is now plenty of support on the build plate... The documentation provided by the manufacturer even details the resin exposure and lifting times and height within optimal temperature range and additional information for another range of temperatures (parameters are expressed in % augmentation compared to the same parameter in optimal conditions). I set an order for small heater to put in the resin chamber, and it also include air filtration. It's set to arrive on Sunday, and in the meantime, I'm printing a few elements in the X1C for the Photon M3 : a cover riser to be able to pass a cable under the cover, a drip mount, and I'll also print a VAT cover, and a VAT drain support (I will need to find 1 meter of 2020 extrusion for this one). 

In short : I'm getting ready for my resin  testing. I have some stuff to do tomorrow morning without any link with rc or 3D printing... Hopefully I can get back to this tomorrow... No news yet regarding the plexiglass sheet, they are expected over the course of next week...

Can't wait to see your print. Is the resin like my printed grB/959 tires? 

I have no clue yet

Soft plastic like hard rubber and shiny like they were varnished.

There was a 3D puzzle preloaded on the printer... It was printed first day, my son tried to find the solution for a week, and finally, we got it assembled...

Really fine of print quality. 👍