We found some waste plywood and concrete reinforcing bar at a building site nearby and developed this part/system for making structures.
There's some... optimising to do and some complimentary parts may follow. However, it's strong enough for current purposes here as a bedside table and display table at our shop.
The parts print reasonably well without support on our printers here. 20% fill and .8mm wall thickness is just strong enough, although greater wall thickness will allow for greater tightening of bolts and will provide a firmer structure.
3d model print parameters
8 bolts/nuts/washers. The ones used are half inch head, quarter inch diameter and 45 mm in length, although 35 mm would work.ld....