Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2878841.
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This pen holder is part of the Drawing Collection, which includes the spirograph and three different pen holders.
The spirograph design is 130x130mm and the pen holder has an 8mm inner diameter that can be resized to fit other pens.
The designs were prototyped on a BQ Witbox Go using BQ Turquoise PLA Fillamentum Traffic Yellow PLA filament. https://www.bq.com/en/witbox-go https://store.bq.com/en/bobina-pla-easy-go-bq https://fillamentum.com/products/fillamentum-pla-extrafill-traffic-yellow