I liked the idea behind this model, but wanted a more sturdy construction that did not involve glue (am not a patient man). So, with a bit of Fusion 360 work, here's this nice trellis that can grow as needed.

No glue required, but pieces have to be snapped together at the same time in order to avoid breaking the connection nubs. Just lay everything you need on a table, align the nubs to the holes and push every connection together using 3 fingers - it'll work and the whole structure will be pretty rigid as a result.

If needed, I can whip up some other designs (corners for example) - just let me know in the comments.

Pictured: a crazy Madagascar jasmin plant with the new trellis.

2021.04.26 added 3 more base files with longer legs (the original one was 7 cm, the new ones are 10 cm, 12 cm and 15 cm).

2024.12.05 as requested, following a patent claim, I am adding here evidence that this model was designed by me and published on Printables 4 months before the patent claim was submitted, therefore being prior art under U.S. law as defined by federal statute 35 U.S.C. 102, as amended by the America Invents Act (AIA).