The connectors are designed with dia of 16.8 mm, so that they fit a 16mm vp tube, compensated for the printer's error when printing holes. The pipe can be attach with 3x20mm screw (wood screw).
Clips for fastening the framework, at the growing bench, have a hole designed for 3mm screw with a 90 degree head.
Clip is designed to hold a fine net or a thin nonwoven fabric.
To my framework I have printed:
10 pcs PVC 16mm Corner
4 pcs PVC 16mm Middle
10 pcs CLIP FASTENER
xx pcs Clips