this is not just an interesting design, but an complete industrial product design concept …maybe some marker manifacturer discovers your design idea and buy it?...it can be used as great promotional item, nice space for logo placement : D
Thanks for the comment, but this product does exist and is often used as a promotional item.
Though, I wish I did invent this design!
Use, by you or one client, in a single end product which end users are not charged for. The total price includes the item price and a buyer fee.
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