Drybox Stand for OpenPrintTag

When printing PETG and ASA I usually print directly from a drybox which sits next to the printer. After upgrading my CoreOne L with the new Prusa OpenPrintTag reader I realized I have an issue with the drybox placement. 

The issue is not that much about loading the filament using information from the NFC tag - you can just hold the drybox next to the NFC reader for a second and load the filament without any problem. The issue is when you want to use the NFC tag to also track the filament usage - in such case the drybox needs to be close to the NFC reader also each time when the print ends - to update NFC tag about the filament amount consumed.

So I created a rather simple box and placed the drybox on top. The box has a removable top with magnets so that it can be used as a small storage. Also you can attach two magnets to the side of the box facing the printer (optional) so that the box is secure and cannot be easily knocked over. And this is the result:

And it works great, I just need to place the drybox with an OpenPrintTag facing the printer. You can see on the printer's screen that the printer registers OpenPrintTag without any issue. Well to be precise, it works great, but only when I am using non-Prusament spools. I have added OpenPrintTag to non-Prusament spools earlier like so:

Prusament spools have their OpenPrintTags inside in the spool center, so that the tag is readable from both spool sides. And in my case the spool center was too far from the NFC reader. So I created a second top to my box, which is extended towards the printer, so that I can place the spools closer to the NFC reader whenever I print from Prusament (not that often though):

And then there is the third adjustment to the box - when printing PLA I prefer to place spools next to the printer instead of using the spool holder directly on the printer. Especially when it is a full spool - very often filament acts like a spring and when hanged on the printer's spoolholder few turns of the filament tend to jump out of the spool. So I added a third top to my box with rollers. The spool then sits on its brims and the filament cannot escape:

Basically the first version of the top - the plain top - is not needed anymore, you can place the drybox also onto the top with rollers, it will fit as well:

When not needed, the rollers and the top may be stored inside the box, if the box is tall enough:

And that is the last item I want to mention - height of the box. My printer is higher because I am using printer feet with squash balls to reduce printer vibrations (https://www.printables.com/model/1212421-prusa-core-onegen2-onel-squash-ball-feet). Hence my box needs to be taller as well - attached STLs contain two box heights - standard one (8cm) and tall one (14cm). Tall one is on the pictures. Anyway the model is parametric and the box height is one of the parameters you may adjust:

• baseHeight (default 140mm)

• baseMagnetWidth (default 6.2mm)

• baseMagnetHeight (default 6.25mm)

• sideMagnetWidth (default 12.2mm)

• sideMagnetHeight (default 6mm)

• topMagnetWidth (default 6.2mm)

• topMagnetHeight (2.25mm)

Also as you can see you will needs some magnets, I used whatever I had at home. All sizes are parametric so you can adjust those as well. I used:

• 4 magnets of size 6x6mm for the box base part (they hold the top)

• 4 magnets of size 6x2mm (inside the top)

• 2 magnets of size 12x6mm (optional) to attach the box to the printer

To modify the parameter values, open attached f3d file in Fusion360 and go to „Modify“ -> „Change Parameters“. Attached STL files use the default values listed above.

I printed the box using Polyterra PLA and I used layer height 0.25mm (!) to print it faster. It is a simple box afterall. Only the rollers need to be stronger so they are printed using Prusament PETG and layer height 0.2mm.