25mm Square steel tube joiners and mounts
thingiverse
PLA mounts and joiners for 25mm steel square tube come in various types. The mount blocks measure 21.5mm in size. I have not printed or used all of them, but a couple, such as the center mount with gap, proved useful when building a canoe rack for my trailer. Using CAD (Shapr3d) is still a learning process for me, so these mounts are a bit rough around the edges. Hopefully, you will find a use for them too, and they can also fit 25mm aluminum square tube, which requires an additional 1mm to reach 22.5mm in size.
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