Snooker Chalk Magnetic Pocket Clip (or Pool/Billiards, also clips to belt)

This model is a magnetic chalk clip designed for Triangle chalk, but any chalk of the same dimension should work (as they are all roughly the same size). There is a magnet embedded in the chalk holder and the chalk clip so that the clip can be hung from your pocket or belt and the chalk is therefore easily accessible/replaceable during play. The magnets I used were 6mm in diameter and 2mm in height, a link to the amazon site is here but any magnets with these dimensions should work.

It is important that your magnets are placed so they attract each other, otherwise the holder will not stick to the hook. I suggest sticking the magnets together prior to printing, and then marking them with a permanent marker to indicate how you should place them in the prints (see placement instructions below).

I've also included a clip for slanted pocket openings with a slanted hook section. I'm working on a magnet-less version as well if you don't have any, and a version with more magnets if yours are a bit too weak for this. If you have any requests or suggestions please let me know in a comment.

Print settings

Filament: Silver Prusament PLA

Layer height: 0.2mm

Supports: No

Infill: 10%, grid

Perimeters and top/bottom layers: 3 perimeters, 4 top and bottom layers

Pausing the print - IMPORTANT

While the prints are running they need to be paused at certain heights in order to insert magnets/tape. For the chalk holder, the first pause should be just before the magnet cavity is covered, the second pause is later on to add some tape during the print to allow the chalk holding wall to flex. The provided gcode and 3mf files should have the pauses in them already. If you want to add them yourself, slice the STL and then navigate to the first layer that covers the internal magnet hole. Note that the added pause happens before the layer selected in PrusaSlicer - as shown below, select the layer that covers the hole and add the pause there.

On the layer indicator bar, right click the “+” symbol to add a pause (M601 for me), you can also add your own pause message here to display on the printer. When the print pauses add the magnet into the hole.

You can then resume the print. 

The second pause is higher up in the print where the wall that holds the chalk will be printed:

There is a 0.4mm gap below this wall so the print needs to be paused here in order to add some tape (or equivalent) to the print so this wall has a surface to print on. I used blue painters tape as PLA sticks well to this. When the print pauses lay some tape onto the print to support the wall. It is probably best to aim for slightly too thich rather than thin here so I used a few layers.

The painters tape can the be removed after the print to leave a gap under the wall:

This allows the wall to flex slightly and hold on to the chalk in the holder.

Adding the magnet to the chalk clip hook is then a similar process (but no tape is required) with only one pause: