12.5 inches diameter round concrete paver mold
thingiverse
You will have to print 3 of this to complete a circle. This part has been fitted for printers with at least 300mm x 300mm or 12" x 12" bed. Tape the 3 parts together. The best tape is foil tape. It sticks good to PLA and will leave no marks or impression on the concrete mix.
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