Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3712839.

Make your icosahedron or dodecahedron any size any tube! This version is in the right dimension for a 18 mm PVC tube (electric). To make it your size just scale it up or down to get, a right fit. The length of each tube should be equal any size! You need 12 joints to print for one icosahedron. If needed dip the tube end in boiling water before fitting. Make your tent, bal, lamp, toy, table, and ........ The centre hole version is weak, 3 is the strongest without hole. Sketchup file included Pentagons