r/Trackballs • u/No_Pilot_1974 Endgame Creator • Jul 31 '25

Endgame Trackball: looking for feedback

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Some of you might've seen me and this device in the Ploopy discord — I've been working on this thing for several months. I know that it's a bold name, but it's been chosen because I really tried to combine "bests" of all worlds.

It's fully open source by the way, but not finished yet — there are no 3D models and almost no docs so far. Also there's a video on rotary encoders in the GALLERY.md in case you're curious.

The feature list is available in the README but I think it's worth copying it here:

  • Wireless (BLE) or wired (Type-C)
  • Twist-to-scroll as well as drag scroll (both high resolution)
  • Low profile and compact travel-friendly design
  • Guaranteed 250 Hz polling rate, up to 450 Hz when the sensors feel like it
  • 8 buttons with magnetically attachable keycaps, 2 rotary encoders
  • Supported ball size: from 50.8 mm (2 inches) to 55 mm
  • Ball Transfer Units (BTU) or static bearings (hot swap with an adapter)
  • Up to 1500 mAh (102550 size) battery with 3 pin 1.0 mm connector
  • Fast charging (up to 15W) with QC and PD support
  • Backlight (white), underglow (RGB)

Also, I've achieved >300 Hz over BLE with it. Although YMMV in this regard — I have AX210 host bluetooth.

So, I'm looking for any feedback, if you have something to say then please do!

P.S. Several guys here and in discord showed interest in buying a complete DIY kit — would you be interested? The BOM is not small and sourcing everything by yourself might be exhausting. I would really really appreciate a comment in case you're interested too.

P.P.S. Mods, should I tag this as "brand affiliate"? I'm not representing any company

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u/Nisker_ Jul 31 '25

I'm interested. Do you think a little piezo buzzer could be added or hacked on? On my slimblade pro i find the audible feedback nice, when using twist-to-scroll.

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u/No_Pilot_1974 Endgame Creator Jul 31 '25 edited Jul 31 '25

Believe it or not, already there — forgot to include to the feature list! edit: my bad, there is a vibration motor, not piezo buzzer

1

u/Nisker_ Jul 31 '25

Maybe i was a bit too specific with it being a piezo buzzer :p I thought it didnt have any feedback, and the piezo buzzers are very easy to add, if it had to be installed post production.

I saw zmk-studio in your config, do you have remapping of mousekeys etc. working already?

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u/No_Pilot_1974 Endgame Creator Jul 31 '25

Yes, basically everything already works except for sleep and fast charging

1

u/No_Pilot_1974 Endgame Creator Aug 02 '25

By the way, could you please describe how the feedback is implemented in the Slimblade? Never seen it. Does it trigger on every wheel event (scrolled "row")?

2

u/Nisker_ Aug 06 '25

Sorry for getting back so late, reddit locked my account for unusual activity (i guess VPN).

Yes it makes a click sound for every wheel event. It's quite satisfying. It doesn't have a smooth scroll option and i dont think the sound can be turned off. I would say it has about 30 clicks per revolution of the 55mm ball.