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2nd project - 4:3 bartop

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Extruder:
I've had great fun with the Vigolix I built, but I've been meaning to build something larger. After procrastinating a while I stumbled across an item that sparked my interest and got the wheels moving again.

While trolling for treasure at the local Goodwill thrift shop I came upon this cool little 8" LCD panel. It is designed for some kind of Raspberry Pi rack mount server cluster. No idea how it got to this shelf, but for $3 I took it home. Nice little screen with HDMI in, powered by USB-C.


I took a basic bartop plan set from the Geek Pub and tweaked the measurements to fit both this little panel and a larger 4:3 monitor panel (also from a thrift shop, paid I think $4 for it.) and ended up with this as the basic design:


Fitted it for the marquee, cut and painted some plexi to go around the small LCD. Don't mind the awkward router scars :) Thankfully that will get covered later by t-molding.


Primed, then painted. This turned out much better than my first project. I used a small foam roller to apply thin coats and sanded between. This resulted in a nice eggshell finish.


Installed a back door with my cooling solution. The lower fan brings air in, the upper blows it out. Powered by a USB adapter.


A test fit of the electronics. Still needs a ton of cable management and organization.
I was going to use a Pi4 but found difficulties getting the 2nd screen marquee working, so I switched to a used Optiplex mini off of Ebay. It was actually cheaper than buying another Pi, is a lot more powerful, and it does dual video-out by default.


The project is nearing completion. Running great, just needs some final configuration and to get the electronics organized and mounted inside the cabinet.
It's at the playable stage now, which is good and bad  ;D Instead of working to finish it I'm constantly distracted by "playtesting".

Extruder:
I forgot to mention the sound system. I really wanted an external volume control. I've tried various software solutions, tray icons, hotkeys, etc and couldn't get it working reliably, so ended up doing this oldschool with a volume knob. Like the other aspects of this project, thrift shopping played a key role. I picked up a set of HP computer speakers for a few dollars and disassembled them to repurpose both speaker drivers and the little built-in amplifier board. The whole setup is USB-powered and was fairly easy to break down using a small pry bar and a dremel.

The speakers were placed in the usual location under the marquee:


I mounted the original amp board inside the cabinet after drilling a hole so the volume pot could be accessed from outside the cab. Ran new wires to connect the speakers back to the amplifier board, and after a little soldering it was good to go.


 I 3d-printed a shaft extension and knob (models obtained free from Thingiverse), which enabled me to have a knob on the outside of the cabinet without having to countersink holes, etc. The shaft extension made it easy to get an exact fit as I could scale the part in my 3d pinter's slicer software for a custom size.


The sound is surprisingly good, and this was much less expensive than one of those retail amp & speaker kits.

pbj:
My God, someone blew the dust off this forum.

Looks great!

 :cheers:

Mike A:
Nice little cab. Love it.

javeryh:

--- Quote from: pbj on March 01, 2026, 07:59:02 pm ---My God, someone blew the dust off this forum.

Looks great!

 :cheers:

--- End quote ---

It's so dusty in here.

Nice project! I didn't know you could output to a second monitor via retropie or whatever.

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