It has tabs to screw it down on a support timber. The cutting slot is set up for a normal handsaw but is not quite wide enough for the ridge on the top of a Tenon saw (but you could rotate the pipe to complete the cut ).
There is a inspection hole at the top to make it easier to find the measure/cut mark.
Supports are needed for my recommended orientation (as shown in the slicer view).
I used PETG for durability and is about a 23 hour print time
The author hasn't provided the model origin yet.