I sometimes struggle to fit Bowden tube clips in tight spaces. I have a few Diamond hot end assemblies (3 colour 0.5mm, 3 colour 0.9mm and 5 colour) which I switch between, so disconnecting Bowden tubes and re-connecting them again is something that I do quite often. I made these longer ones which help a great deal. I printed 10 and which took about 12 minutes. The part that fits under the collet is 0.9mm thick so 0.3mm layer height works well. The hole diameter is 5mm.