Prusa Mini enclosure led mount

This is simple LED strip mount for Original Prusa Mini enclosure.

Model

It has 40cm of length, 1,2cm of width and is mounted by 3 bolts to the small “rounding” wall between main walls.

I have designed it to use leftover M3x8 bolts and M3n nuts from the enclosure. Bolt cylinders have a pocket for nut so there is no need to hold them while screwing in the bolts. I have noticed some overhangs in these pockets, but it does not a problem - it even holds the nut a bit better.

Because this holder is 40cm long I have split it into 3 parts. Parts connect to each other by small clips. It does not have to fit perfectly and tightly - just enough so the parts don't move while attaching LED strip. I have also attached 1-piece model.

Maybe model could use some additional supports between main part and the enclosure as it bends a bit while installing, but that was not a deal breaker for me, so I skipped this improvement.

Printing tips

I have printed all parts with quite standard PrusaSlicer settings:

• PLA
• 2 perimeters
• 0,15mm quality layer
• 15% infill
• organic supports on the edge of nut hole and under the hanging clip parts

LED

I have decided to use 12V, 8mm wide LED strip with 60 diodes per meter, based on SMD 3528, IP20 4,8W/m white neutral 4300K.

For this strip I needed at least 4,8*0,4 = 1,92W power supply (+ some buffer). I decided to use 24W PSU because I'd like power WiFi camera in the future, but 3W would be enough for LEDs alone.

To easily turn on and off the light I have installed a led strip dimmer, but honestly I'm not 100% happy with it as it has useless “demo” button and requires to hold other button to turn the light off, which also changes the light level every time. Next time I'd either consider some other dimmer or simple 2-state switch with separate optional dimmer set to preferred light level.

One of the images is an electrical schema presenting both options - a dimmer and a switch. Switch can be placed either between LEDs and power supply or before power supply. Second option is better because it cuts the power entirely, but first one is probably easier because how wires are placed around the enclosure.

LED strip is connected with a connector so it's easy to disconnect if needed. From there, wires go outside of the enclosure and are soldered to the dimmer. From the dimmer, wires travel back to enclosure and are connected to power supply with quick connectors. All the outside wires are wrapped in head shrinking tube, however that's not most aesthetic solution probably ;-) Same as the 230V AC cord on the other side of power supply. I didn't want to solder it because it would be problematic to put everything through enclosure's bottom holes. I was considering using nice 2.1/5.5 power connectors but was to lazy to solder it, so I ended up with pass-through quick connectors. On the photo there are separate connectors for each wire only because I had such at hand - 2-wire connectors would be even better. Connectors and soldering can be replaced by simple wire twisting and a isolation tape, so no need for electrical workshop at home.

Price list:

• LED strip: 2,8€ /m
• LED strip connector: 0,7€
• Dimmer switch 4A 12/24V: 1,2€
• PSU 12V 2A, 24W: 9,3€ (but for ~5W would be around 3,5€)
• 230V AC cord: 1,5€
• pass-through quick connectors: 4x0,4€ = 1,6€

That's around 17,1€ in total (or 11,3€ with more fitting PSU). Some additional wires and heat shrink tube I had in my stash, but these are minimal costs. Comparing to original 80€ LED strip, I'm really satisfied with the result and saved money, even if does not look so well and is not perfectly organized.

All suggestions, comments or questions are always welcome.