https://www.printables.com/model/1039170-telescoping-mast-base-plate
I made this before finding this model. I highly recommend this model versus the one I made: https://www.printables.com/model/225224-spiderbeam-12m-mast-ham-radio.
The support tube's I.D. is 2.25 inches. It will accommodate 1.75 - 2.20 inch O.D. mast sizes. I printed it at 25% infill, honeycomb, four walls, and with PETG since it will be outside in the elements. I am tired of making it as lightweight as possible for POTA/SOTA applications. Don't forget to post those prints!
You can find the TN07 mast here:https://tn07.com/32-portable-antenna-mast
I'm not affiliated with this product and receive no compensation if you purchase the TN07.
The author marked this model as their own original creation.