Instruction based on Muller&Sohn "Basic shirt block for normal size" (p49).

Fabric: Knit. I use cotton jersey. Ribbed knit for collar.
All steps recorded except topstitches and changing fabric color.
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Sketchfab preview.
Download link for 3D files (expire after a month).
Download link for basic block. The folder name is "Thomas - Muller&Sohn - Basic Shirt Block 240321"
I also prepared a pdf file for A0 printing. In my locality, it cost about 1 USD for a piece of A0 print. For plotter or other paper size, use the seamly2D file to export it yourself. You can download them in 'custom avatar' folder. Search for "Butterfly Male M - T-Shirt 240321" folder. It is for male chest circumference 96 cm. 1 cm seam allowance included. The hems have 2.5 cm allowance for folding.

Sorry that the pdf is flipped, but it does not matter for printing.
Obviously, you can print directly from Clo, but some modification is needed. I real life, the collar is folded, and is a one continuous piece.