Step 6: Ease of Assembling/Dismantling:
Make cuts of about 12mm length at both ends of each of the 27pcs.
This makes pushing the pipes into the fittings & removing them easy.
Without these cuts, if you push the pipe tightly into a fitting (even without glue), It'll really be difficult for kids to pull it out. So these cuts are a MUST.
Clean all cuts using fine grade sandpaper or a file.