Simple wall spool holder

I was looking for a simple spool wall holder, that can be printed fast and at least to print 4 of them in the same plate.So i decided to design it. It needs a plastic pipe or wooden rod of 20mm. The caps are desingned for a plastic pipe with OD 20mm and ID16.5mm It was printed with the 0.20 Strength profile (25% infill and gyroide profile)