Inspired by the stands I saw after a quick search and their absurd prices and flabby construction I decided to make one myself.
This one comfortably holds an approx 2m tall tree with a 85mm diameter bottom part (excluding branch stumps).
You will need M10x30mm bolts for fixation and 4.9x19mm screws to hold it together. If you need to use imperial screws, or adjust any other dimensions, the CAD file attached will help to make the necessary edits.
I made the legs out of 12mm (roughly 1/2") plywood. The dimensions are arbitrary as I cut them manually from whatever I found in the garage, but the .dxf file attached has the dimensions that worked for me. Namely 250mm long and 80mm high.
Printed on Tevo Little Monster with 0.6mm nozzle in Devil Design PETG. I used 3 outlines and 10% infill with a single solid infill layer at each of the 10mm fixation screw holes. Such fanciness is not necessary though, but a higher infill percentage like 15 or 20% might inspire more confidence.
Devil Design PETG