Update. I have finalized the design and will be offering the Taom chalk holders for sale. (I'll make another thread in the FS forum).
I've been using the final design for 6 months, and it's held up great. The square shape makes it much more comfortable to apply chalk for me. It feels like Masters now. Also, the chalk does not run away from you when dropped. I've even dropped it in Diamond ball return pockets before, and it has stayed at the bottom of the pocket rather than roll into the center of the table.
The material is now rubberized. It's called "TPU for AMS". It's only slightly soft, about the same as a car tire. This gives it a bit better grip in the hand, and a bit of compliance to make the tolerance to the chalk more forgivable. It still has the texture, which also works great for the grip. There is also texture in the inside that holds the chalk firmly. This material only comes in 7 colors. They are all shown below.
I can now do customizations. The customization can be any text, but must be one of the 7 colors. The text does lose some detail the smaller it is. Text only, no graphics.
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These are the 7 colors.
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The fit around the chalk is snug. A pen or key is used to push it out from the access hole.
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When the chalk gets worn down, a coin can be added behind it to keep it flush with the top of the holder. A quarter will fit. I have tested it with super thin chalk, and several coins, and it works great.
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If the chalk is brand new, the fit is a very nice snug fit. If the chalk is well used (and it's never been in a holder), the paper is usually damaged somewhat, and then the fit is tight. It will still go in with more pushing. Worse case, rip a tiny bit of the paper off or try to smooth it out before inserting.
Final CAD: (the clearance to the chalk is taken up by the texture which is applied in the printer software, not the CAD software)
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Prices:
$15 for a customized one
$7 for a plain one
$2 shipping USA48 for up to qty 2.
Thanks all for looking! PM me if interested.